rix313 wrote:I'm a mastick man myself
hoshy wrote:And silicone sealant is my other favourite
Rotrex M42 Build - 285bhp little update
Moderator: martauto
As some of you may know i bought some M42 supertech valves, retainers and springs off E-bay from a guy in ireland from an unfinished project.
These are solid and made of better suited material than the bmw ones for my boosted application.
However, when i got them and measured them the stems were only 6mm not the usual 7mm on and e30 m42, e30 is the important bit here, emailed supertech ot ask how i was supposed to fit then and made out i'd just got them from one of there dealers.
Turns out then never new the m42 was in a E30 and these valves were made for the e36 m42 which had 6mm valves from mid 92 onwards up till the m44 came along. however they did offer to make me a set of new guides so they would fit my e30 7mm head for £8 each plus Vat + shipping
Pure luck would have it i bought a e36 m42 head off kedge last year with a job lot of m42 bits he was selling and the guides look to me good in this so ive have sent this off to be re cut to suit the new valves.
the other problem is that the stem seals are also 6mm and these are also harder to get hold of although ive now been able to get hold of some, and the guides are NLA just so you know.
Before the head went off i stripped it and steam cleaned it, heres the pics.
And whats all this got to do with todays up date?
When i sorted the stem seals it was only a tenner more for a Victor rymes ( eom) head gasket set than bmw wanted for just 16 stem seals and i thought that the other gaskets would probly come in handy at some point, like today, so i orderd one.
I orederd the gasket set thursday and was told it would be here today for me to pickup from parkside bmw.
So woke up early on my day off and started to do the timeing case gasket which has leaked ever since i got the car but has started to get worse of late, thought i'd be able to get to the gasket without taking the thermostat housing off but snapped one of the heads off the case bolts in the removal process and it turns out i wouldn't have been able to change the gasket anyway with the housing on.
so a simple job turns in to a major one, draind the coolent and removed the housing, removed the timing case cover which wasnt realy down to the gasket and was sitting proud of the rest of the head at the top( the holes are slotted so it does move during installation) this means the cam cover/gasket was sitting on a small step, removed the snapped bolt stud with mole grips.
It is actuly quite clean in there although the phones flash has made it look abit more orangey than it is.
next stuffed half a roll of kitchen paper down the timing case hole to stop sh1t going down when i cleaned the gasket surfaces (yes i made sure i got it all out again
) also borrowed the hoover to catch the crap thas had got in the little gaps.
You can see from the cleaned timing case were the oil had soaked in to the crap on the cover and stopped it from corroding
theres a diagnol line from between the top and 2nd hole on the left hand side to the bottom hole on the right hand side
So with everything cleaned ready to be re assembled rang parkside, no gasket set, ECP/GSF have no 6mm stem seal gasket sets in stock at any store. so its been reordered from some were else for tomorrow.
Moral of the story, never ever do a "small job" when you know you need your car the next day, or when its going 100miles to get remapped on friday, i should no better
Also got this made at the weekend for my run down to emerald as the cars abit hard to drive as you cant use light throttle openings to much or the AFR leans out, its ok on WOT though
These are solid and made of better suited material than the bmw ones for my boosted application.
However, when i got them and measured them the stems were only 6mm not the usual 7mm on and e30 m42, e30 is the important bit here, emailed supertech ot ask how i was supposed to fit then and made out i'd just got them from one of there dealers.
Turns out then never new the m42 was in a E30 and these valves were made for the e36 m42 which had 6mm valves from mid 92 onwards up till the m44 came along. however they did offer to make me a set of new guides so they would fit my e30 7mm head for £8 each plus Vat + shipping
Pure luck would have it i bought a e36 m42 head off kedge last year with a job lot of m42 bits he was selling and the guides look to me good in this so ive have sent this off to be re cut to suit the new valves.
the other problem is that the stem seals are also 6mm and these are also harder to get hold of although ive now been able to get hold of some, and the guides are NLA just so you know.
Before the head went off i stripped it and steam cleaned it, heres the pics.
And whats all this got to do with todays up date?
When i sorted the stem seals it was only a tenner more for a Victor rymes ( eom) head gasket set than bmw wanted for just 16 stem seals and i thought that the other gaskets would probly come in handy at some point, like today, so i orderd one.
I orederd the gasket set thursday and was told it would be here today for me to pickup from parkside bmw.
So woke up early on my day off and started to do the timeing case gasket which has leaked ever since i got the car but has started to get worse of late, thought i'd be able to get to the gasket without taking the thermostat housing off but snapped one of the heads off the case bolts in the removal process and it turns out i wouldn't have been able to change the gasket anyway with the housing on.
so a simple job turns in to a major one, draind the coolent and removed the housing, removed the timing case cover which wasnt realy down to the gasket and was sitting proud of the rest of the head at the top( the holes are slotted so it does move during installation) this means the cam cover/gasket was sitting on a small step, removed the snapped bolt stud with mole grips.
It is actuly quite clean in there although the phones flash has made it look abit more orangey than it is.
next stuffed half a roll of kitchen paper down the timing case hole to stop sh1t going down when i cleaned the gasket surfaces (yes i made sure i got it all out again
) also borrowed the hoover to catch the crap thas had got in the little gaps.You can see from the cleaned timing case were the oil had soaked in to the crap on the cover and stopped it from corroding
theres a diagnol line from between the top and 2nd hole on the left hand side to the bottom hole on the right hand side
So with everything cleaned ready to be re assembled rang parkside, no gasket set, ECP/GSF have no 6mm stem seal gasket sets in stock at any store. so its been reordered from some were else for tomorrow.
Moral of the story, never ever do a "small job" when you know you need your car the next day, or when its going 100miles to get remapped on friday, i should no better
Also got this made at the weekend for my run down to emerald as the cars abit hard to drive as you cant use light throttle openings to much or the AFR leans out, its ok on WOT though
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Well, went down to see Dave Walker yesterday and got the car remapped with the new charger on.
Set off from mine at 12 and got to his for 3ish, i can say that a 3hour 100mile drive in a a car that you cant realy use part throttle on stuck behind lorries on the A17 isn't much fun!
I had to keep dropping back, using half throttle then knock it out of gear and coast for a bit to keep the AFRs from going lean.
The journey back was alot smoother apart from a large foam fire extinguisher i had on the back seat went off whilest exiting a roundabout, the hose was pointing forward and sent foam on to the back of the seats, dash, windscreen and me, then filled up the back seat foot well so i had to stop and clear some of it out, you can just see what i scraped off my arm on to the floor in this pic, luckily it seamed to disolve ok with out damaging anything. Sh1t me up abit 
Anyway, heres the results so far, Asked dave to map it up till it made 8psi boost as i didnt what to go much more than what it was running before still on the standard internals.
BHP - Red
Tourque - Blue
AFR - Green
Boost - Purple
And heres the new plot against the first set up.
Supercharger setup #1 - 205bhp@6521rpm 178ftlb@4310rpm
Supercharger setup #2 - 187bhp@5301rpm 185ftlb@5301rpm
As you can see from the graph the new setup is going to be a much more topend power build and feels as if just starting to get in to its stride past 4.5krpm which is what i missed so much with the Eaton blower making the car much more low down torquey car.
Just looking at the curves and putting a rule next to them if it carries on rising like it appears to be at 6500rpm i think i should be seeing something like 13-14psi boost and 260ish BHP, which int bad but i was hopeing for a little more, so might have to fit a smaller pully at some point although i cant find much info on how the rotrex boost changes as they become more effiecent higher in the RPM.
I also had the pleasure of seeing/hearing the RX7 with the LS? engine in it Dave writes about in his "Walkers World" section in PPC 7ltr 700bhp V8
What a car that thing is, dave took it for a spin and said you can almost feel the chassis twisting under the power
Set off from mine at 12 and got to his for 3ish, i can say that a 3hour 100mile drive in a a car that you cant realy use part throttle on stuck behind lorries on the A17 isn't much fun!
I had to keep dropping back, using half throttle then knock it out of gear and coast for a bit to keep the AFRs from going lean.
The journey back was alot smoother apart from a large foam fire extinguisher i had on the back seat went off whilest exiting a roundabout, the hose was pointing forward and sent foam on to the back of the seats, dash, windscreen and me, then filled up the back seat foot well so i had to stop and clear some of it out, you can just see what i scraped off my arm on to the floor in this pic, luckily it seamed to disolve ok with out damaging anything.
Sh1t me up abit Anyway, heres the results so far, Asked dave to map it up till it made 8psi boost as i didnt what to go much more than what it was running before still on the standard internals.
BHP - Red
Tourque - Blue
AFR - Green
Boost - Purple
And heres the new plot against the first set up.
Supercharger setup #1 - 205bhp@6521rpm 178ftlb@4310rpm
Supercharger setup #2 - 187bhp@5301rpm 185ftlb@5301rpm
As you can see from the graph the new setup is going to be a much more topend power build and feels as if just starting to get in to its stride past 4.5krpm which is what i missed so much with the Eaton blower making the car much more low down torquey car.
Just looking at the curves and putting a rule next to them if it carries on rising like it appears to be at 6500rpm i think i should be seeing something like 13-14psi boost and 260ish BHP, which int bad but i was hopeing for a little more, so might have to fit a smaller pully at some point although i cant find much info on how the rotrex boost changes as they become more effiecent higher in the RPM.
I also had the pleasure of seeing/hearing the RX7 with the LS? engine in it Dave writes about in his "Walkers World" section in PPC 7ltr 700bhp V8
What a car that thing is, dave took it for a spin and said you can almost feel the chassis twisting under the power
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
I ran mine flat out 13,800 rpm out of 14,000 rpm at 6,500 engine rpm and it made 8psi in the graph above with 70c inlet air before the charge cooler/intercooler (what ever you use).
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Work. What do you need? Stainless bends are about £4-5-6 each 2-2.5-3'' 90 or 45d we also do reducers an fitings. I used it because it was the but you can get ally bends of ebay quite cheap and there lighter.
If you want stainless though get me a list of what you want and ill get a price.
If you want stainless though get me a list of what you want and ill get a price.
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
-
rix313
- E30 Zone Team Member
- Posts: 4957
- Joined: Fri Oct 31, 2008 11:00 pm
- Location: Silverstone
- Contact:
Cheers bud, all I need is a 90 degree to come out of my S/C bracket because obv can't join the Ali tube and the steel bracket, unless I make the bracket out of Ali ??
What is your crank pully set up mate? Guessing the alternator uses the current V, S/C on the pully wheel you've got there. How does the PAS run?
What is your crank pully set up mate? Guessing the alternator uses the current V, S/C on the pully wheel you've got there. How does the PAS run?
Well ive not up dated this thread in a while so heres a small one.
After GeoffBobs super effort with helping me out with the project ive fitted the smaller supercharger he suggested and its working realy well.
Read all about it here.
http://www.e30zone.net/modules.php?name ... 25&start=0
The new charger arrived
I offered it up but with the current belt it there was not enough adjustment in my tensioner to take up the slack due to the smaller pully
So two options here, either space the bracket off the block, adding more stress to the block mounting holes or go back to halfords and try and get a smaller belt.
After playing around with spacers it worked out that i would have to double the spacers to account for the slack, i wasnt happy with this so went to halfords to try and get a smaller belt, they had non in stock but after finding a belt that fitted perfectly but 4v they ssaid they could get a 6v version in for that afternoon so job done!
Fitted the new belt and its even an even better fit than the first one i had, its neary tight enough with out a tensioner! this means if i wanted to i could swop to a much smaller neater tensioner in the future if i wanted to swop back to my 4v power steering belt which i cant currently run due to the tensioner being in the way
Small things, the new belts fitted and has a large white and red patch on it which looks mint spinning round the pullys just like a proper super charger should do. LOL
New belt fitted
On the side while i was waiting for the new charger to arrive i fitted my 1.9Z3 quick rack which was a night mare as all the pipes wasnted to run were i put my alternator so i had to borrow works pipe benders and "alter"the origonal 318is one to fit the Z3 rack.
Pic
New pipe bent
Fitted in a tight space.
Ignore the oil everwere it was from slack power steering coupling the first time started it, ooops
Got next week off so should be able to get lots done on the testing side of things
After GeoffBobs super effort with helping me out with the project ive fitted the smaller supercharger he suggested and its working realy well.
Read all about it here.
http://www.e30zone.net/modules.php?name ... 25&start=0
The new charger arrived
I offered it up but with the current belt it there was not enough adjustment in my tensioner to take up the slack due to the smaller pully
So two options here, either space the bracket off the block, adding more stress to the block mounting holes or go back to halfords and try and get a smaller belt.
After playing around with spacers it worked out that i would have to double the spacers to account for the slack, i wasnt happy with this so went to halfords to try and get a smaller belt, they had non in stock but after finding a belt that fitted perfectly but 4v they ssaid they could get a 6v version in for that afternoon so job done!
Fitted the new belt and its even an even better fit than the first one i had, its neary tight enough with out a tensioner! this means if i wanted to i could swop to a much smaller neater tensioner in the future if i wanted to swop back to my 4v power steering belt which i cant currently run due to the tensioner being in the way
Small things, the new belts fitted and has a large white and red patch on it which looks mint spinning round the pullys just like a proper super charger should do. LOL
New belt fitted
On the side while i was waiting for the new charger to arrive i fitted my 1.9Z3 quick rack which was a night mare as all the pipes wasnted to run were i put my alternator so i had to borrow works pipe benders and "alter"the origonal 318is one to fit the Z3 rack.
Pic
New pipe bent
Fitted in a tight space.
Ignore the oil everwere it was from slack power steering coupling the first time started it, ooops
Got next week off so should be able to get lots done on the testing side of things
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Can check for you but roughly 15mm + alittle bit for the pully to locate on
you could probly use a smaller one and run the belt on the air con pully, the one behind the one mine is on if your temsioner isnt in the way.
as you can see from mine the bottom of my tensioner is to low and in the way to use this v of the pully
you could probly use a smaller one and run the belt on the air con pully, the one behind the one mine is on if your temsioner isnt in the way.
as you can see from mine the bottom of my tensioner is to low and in the way to use this v of the pully
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
-
Ant
- Retired Team Member
- Posts: 10496
- Joined: Tue Dec 21, 2004 11:00 pm
- Location: PD+E dept :D
- Contact:
Just caught up on all this, well done all involved
for comparison, I mapped an M42 with a GT302071R this week, 11psi on stock internals(rebuilt) gave 225.3 BHP @5800 and 220.1 lbs/ft @ 4500 rpms, thats @ 32.5 degrees C ambient with intake temps of 42.7 degrees C with heatsoak.
using 30lbs/hr injectors it runs to 61 % duty so some headroom there.
@ Matt, using a belt short enough so you almost have to wind it on is great dude, the tensioner will have a much easier time and will help greatly with any belt"wind up" you're getting.
typo edit
for comparison, I mapped an M42 with a GT302071R this week, 11psi on stock internals(rebuilt) gave 225.3 BHP @5800 and 220.1 lbs/ft @ 4500 rpms, thats @ 32.5 degrees C ambient with intake temps of 42.7 degrees C with heatsoak.
using 30lbs/hr injectors it runs to 61 % duty so some headroom there.
@ Matt, using a belt short enough so you almost have to wind it on is great dude, the tensioner will have a much easier time and will help greatly with any belt"wind up" you're getting.
typo edit
Last edited by Ant on Sat Aug 01, 2009 9:04 pm, edited 1 time in total.
Product Development and Endurance for Delphi.
Original performance chips, original works not unlicensed copies Email FTW
Original performance chips, original works not unlicensed copies
Email FTWA GT30?
You should be running it to 300hp as that´s where it starts to work real well.
People underestimate the M42, it´s highly capable of nice numbers and is for the most parts just a 4cyl M50.
You should be running it to 300hp as that´s where it starts to work real well.
People underestimate the M42, it´s highly capable of nice numbers and is for the most parts just a 4cyl M50.
-
ShepsEvo3
- Master of go faster
- Posts: 1881
- Joined: Tue Mar 29, 2005 11:00 pm
- Location: Bristol/Wiltshire
Ant, have you got a graph of that one with boost and AFR profiles? I'd be interested to look at thatAnt wrote:Just caught up on all this, well done all involved
for comparison, I mapped an M42 with a GT302071R this week, 11psi on stock internals(rebuilt) gave 225.3 BHP @5800 and 220.1 lbs/ft @ 4500 rpms, thats @ 32.5 degrees C ambient with intake temps of 42.7 degrees C with heatsoak.
using 30lbs/hr injectors it runs to 61 % duty so some headroom there.
E30 M3 Unichip Alpha N style conversions, this is the ultimate for extracting the best out of your S14 M power car.
Also, Live mapping of your Standard Motronic ECU for optimising all your modifications.
www.sabre-tuning.co.uk
Also, Live mapping of your Standard Motronic ECU for optimising all your modifications.
www.sabre-tuning.co.uk
-
Ant
- Retired Team Member
- Posts: 10496
- Joined: Tue Dec 21, 2004 11:00 pm
- Location: PD+E dept :D
- Contact:
@ Gunni, customer wanted 11 psi, thats where I stopped( I didn't build the car, just refine the management ) He'll be back for more, such is the nature of these things
@ Paul, they are with the customer, but I'll try and get some scans, or reprints from the dyno.
@ Paul, they are with the customer, but I'll try and get some scans, or reprints from the dyno.
Product Development and Endurance for Delphi.
Original performance chips, original works not unlicensed copies Email FTW
Original performance chips, original works not unlicensed copies
Email FTWIs he on here ant would be intreteed to see some pics. 225bhp at 11psi is a good figure would be intrested to see the graphs to if possible.
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Not much of an update although i will be wrighting one soon.
heres a short vid for anyones whos intrested
http://s251.photobucket.com/albums/gg31 ... V00967.flv
heres a short vid for anyones whos intrested
http://s251.photobucket.com/albums/gg31 ... V00967.flv
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Cheers Uwe, thanks for the comment, realy nice talking to you on a technical level about your project and the ring to:D
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Couple of pics of mine from the pod.
me washing it.
Me stood next to it after a wash and detail at the pod.
Dont think the lights turned out bad in the end to say the fakes
me washing it.
Me stood next to it after a wash and detail at the pod.
Dont think the lights turned out bad in the end to say the fakes
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Had me going there for a minute Matt, thought that was you on the left in the purple top. Your car looks really good, hope everyone else appreciated what's under your bonnet!
"It is amazing how many drivers, even at the Formula-1 level, think that brakes are for slowing the car down." - Mario Andretti
Trouble is i cant rev it past 5200rpm at the minute as the engines still the origonal high comp one so its only running 187bhp at the minute till the low comp motors in, then its 7.2krpm an 280bhp+
With the old eaton set up running 205bhp and an long 3.64 diff (now running 3.91) it ran a 15.72.
So shorter diff another 100ish bhp should see that drop a good bit. Plus that was my first and only run up the strip last year.
With the old eaton set up running 205bhp and an long 3.64 diff (now running 3.91) it ran a 15.72.
So shorter diff another 100ish bhp should see that drop a good bit. Plus that was my first and only run up the strip last year.
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
Well i now have enough intresting developments to wright a decent update.
Not much has happened in nearly a year with the engine build, basicaly due to the engine shop building the engine.
firstly not to knock the guy as it has been a hard year for all small buinesses but still
When i first spoke to the guy he said he could do my build for me but that it would be a few months before he could start it due to the work he already had on, this was last feb ish time IIRC as he was rushed trying to finish some race engines for the new season but that he would start on the few jobs on the build he could and then dip in and out of my project as and when he had time as it wasnt a streight forward buy bits off the shelf, fit bits.
I knew this and havent realy pushed the job as ive used the money i had saved for the engine to pay for my new garage and other things and so on.
any way i had origanly hoped it would be ready for christmas so i could do some of the build up over the holidays.
so rang him up and he says, no more beating round the bush, i havent ordered your pistons as ive not had the money, the buisness has been struggling and ive started a new garge to bring some more money in to the engine shop, hopefully i'll start yours full on after christmas.
now this didnt realy wash as if he had have asked then i would have paid for bits upfront to get the job moving but what ever...
After richs thread about pistons as Tim_s posting the info on TopEnd Performance (www. racetep.com) in the USA who have all the blue prints for bmw pistons and are the distrubuter for JE bmw forged pistons.
I spoke to Steve Nelson who is a top bloke who realy knows his stuff, as did tim and orderd my pistons christmas eve.
Spec is
8.5:1 CR
over bore to 84.5mmm
Valve recess retained
4x forged JE pistons
heavy duty wrist pins
ceramic coated crowns
moly coated skirts
contact reduction groves
gapped rings
£625 including shipping ( they also do a Low price recipt for customs)
Any way ive finaly got some of the bits back from the engine shop.
Ive got my head back! its an early E36 M42 head with 6mm valve stems as apposed to the E30 M42 7mm stems
the heads been ported, fitted with supertec high temp coated valves skimmed and had a repair done to a small crack in the cam chain tensioner plug threads (theres more weld than the crack was) the valves 3 angle cut and ground in.
heres some pics!
Unfortunataly the hose connections was damaged in transit which has realy pissed me off, it was well rapped up and boxed, must have been the DHL man trying to driff his sprinter in the snow we've had!
It also wasnt quite as clean inside the water channels as i would have liked so ive decided to strip it down again and steamclean/degrease it and then rebuild it again.
Stripping it down on the kitchin table, no way is this going in the garage, its not clean enough out there. lol
When stripping the valves out i wanted to use one of those little straw things to fit over the end of the valveso as not to damage the valve stem seals as you draw the valve out over the collet groove..... but i couldnt find one anywere so i improvised
what i did was to oil up the valves to make them easier to pull through and then cut a sliver of heat shrink and put it over the stem and shrank it, hay presto it shunk into the groove and bridged the gap they pulled out smooth as a smooth thing
Labled all the valves up
All stripped
Heres a few pics of the porting.
Hopefully i will be able to add an update with pics of my new pistons.
Not much has happened in nearly a year with the engine build, basicaly due to the engine shop building the engine.
firstly not to knock the guy as it has been a hard year for all small buinesses but still
When i first spoke to the guy he said he could do my build for me but that it would be a few months before he could start it due to the work he already had on, this was last feb ish time IIRC as he was rushed trying to finish some race engines for the new season but that he would start on the few jobs on the build he could and then dip in and out of my project as and when he had time as it wasnt a streight forward buy bits off the shelf, fit bits.
I knew this and havent realy pushed the job as ive used the money i had saved for the engine to pay for my new garage and other things and so on.
any way i had origanly hoped it would be ready for christmas so i could do some of the build up over the holidays.
so rang him up and he says, no more beating round the bush, i havent ordered your pistons as ive not had the money, the buisness has been struggling and ive started a new garge to bring some more money in to the engine shop, hopefully i'll start yours full on after christmas.
now this didnt realy wash as if he had have asked then i would have paid for bits upfront to get the job moving but what ever...
After richs thread about pistons as Tim_s posting the info on TopEnd Performance (www. racetep.com) in the USA who have all the blue prints for bmw pistons and are the distrubuter for JE bmw forged pistons.
I spoke to Steve Nelson who is a top bloke who realy knows his stuff, as did tim and orderd my pistons christmas eve.
Spec is
8.5:1 CR
over bore to 84.5mmm
Valve recess retained
4x forged JE pistons
heavy duty wrist pins
ceramic coated crowns
moly coated skirts
contact reduction groves
gapped rings
£625 including shipping ( they also do a Low price recipt for customs)
Any way ive finaly got some of the bits back from the engine shop.
Ive got my head back! its an early E36 M42 head with 6mm valve stems as apposed to the E30 M42 7mm stems
the heads been ported, fitted with supertec high temp coated valves skimmed and had a repair done to a small crack in the cam chain tensioner plug threads (theres more weld than the crack was) the valves 3 angle cut and ground in.
heres some pics!
Unfortunataly the hose connections was damaged in transit which has realy pissed me off, it was well rapped up and boxed, must have been the DHL man trying to driff his sprinter in the snow we've had!
It also wasnt quite as clean inside the water channels as i would have liked so ive decided to strip it down again and steamclean/degrease it and then rebuild it again.
Stripping it down on the kitchin table, no way is this going in the garage, its not clean enough out there. lol
When stripping the valves out i wanted to use one of those little straw things to fit over the end of the valveso as not to damage the valve stem seals as you draw the valve out over the collet groove..... but i couldnt find one anywere so i improvised
what i did was to oil up the valves to make them easier to pull through and then cut a sliver of heat shrink and put it over the stem and shrank it, hay presto it shunk into the groove and bridged the gap they pulled out smooth as a smooth thing
Labled all the valves up
All stripped
Heres a few pics of the porting.
Hopefully i will be able to add an update with pics of my new pistons.
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
-
Turbo-Brown
- Boost Junkie
- Posts: 4705
- Joined: Tue Feb 15, 2005 11:00 pm
- Location: Aldershot, Hants
- Contact:
Do be very sure to double and tripple check what TEP have made for you.
They cocked up my pistons, despite having "specced every combination of rod length, CR and crank throw" that's going!
They cocked up my pistons, despite having "specced every combination of rod length, CR and crank throw" that's going!
Will do alex thanks for the heads up, how did they get yours wrong?
Standard M42 gasket with an 'o-ringed' block.
TEP do do M42 comitec head gaskets but my blocks been o-ringed already an you dont realy need to do both.
There gaskets were $175
Standard M42 gasket with an 'o-ringed' block.
TEP do do M42 comitec head gaskets but my blocks been o-ringed already an you dont realy need to do both.
There gaskets were $175
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
-
Turbo-Brown
- Boost Junkie
- Posts: 4705
- Joined: Tue Feb 15, 2005 11:00 pm
- Location: Aldershot, Hants
- Contact:
Well, I said I'm using the M52B28 crank which has a throw 9mm longer than the M20B25.
I also said I wanted to use 135mm rods which means they needed to move the gudgeon pin towards the crown of the piston by 4.5mm
However for some inexplicable reason, they only shifted it by 4.2mm which meant that the pistons poked up by 0.3mm too much.
I also specced a 8:1 CR, but they made them about 8.5:1.
Not very impressive!
I also said I wanted to use 135mm rods which means they needed to move the gudgeon pin towards the crown of the piston by 4.5mm
However for some inexplicable reason, they only shifted it by 4.2mm which meant that the pistons poked up by 0.3mm too much.
I also specced a 8:1 CR, but they made them about 8.5:1.
Not very impressive!
Had a spot of bother with TEP/Steve myself, but overall I was happy with my pistons. They didn't mention the detent on the oil ring rails (which would have been bloody useful!) and a few other things, also had a mismanufactured oil control ring rail on the first set of rings and didn't do a lot to put that right. Plus they really pushed totalseal rings which I'm not convinced about and had a bit of bother over. Aside from that they've been good at getting bits to me quickly and have offered plenty of advice (when they want to or you chase them up!).
Head looks good Matt, i went a lot further with the porting etc on mine, but then again mine is an NA engine!
I use a cometic gasket, a custom one with a bigger bore. Is pretty good, no hot spots in between the bores on mine and saves changing gasket every time you pull the head.
Head looks good Matt, i went a lot further with the porting etc on mine, but then again mine is an NA engine!
I use a cometic gasket, a custom one with a bigger bore. Is pretty good, no hot spots in between the bores on mine and saves changing gasket every time you pull the head.
2.1 318is, MS, LPG. 200bhp, 175ft/lbs GONE!
Boxster, e46 m3, e36 sport touring and alpina B3 3.0
Sorry tim this doesnt realy mean much to me, what was wrong with the ring?tim_s wrote:Had a spot of bother with TEP/Steve myself, but overall I was happy with my pistons. They didn't mention the detent on the oil ring rails (which would have been bloody useful!)
He did also try to push the total seal rings with me but after talking to the guy who will be putting all the bits togeather he said hes used them before in some drag engines but hes never been completly happy with them or thought that the amount of messing around/uncurtainty over standard rings was worth the tiny BHP increase.
Which is why i went for JE gapped rings.
Hope mine come all OK!
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box