Twin Seq. Dry sumping for beginners :D

[march109]

No worries I was preparing myself for VAT and duty anyway. Supposed to be charged on anything over £18 so its rare you get away ith it these days!

[Andy335Touring]

You've probobly already got it in hand but are you going to weld in some sort of internall brace to the plenum help it from expanding and contracting ?

[Turbo-Brown]

Ooooooh yes Going to be a series of rods welded in top and bottom to prevent it puffing up

[suzie650]

concerning the diffs, you can get 2.93 and 2.79 off eta's. (188 casing)

[Turbo-Brown]

Ohh, that's interesting! Is the 188 case the bigger of the ones the E30 had? There was an E28 535e too wasn't there? EEEEEeeeeenteresting, will have to have a forrage for one o' them

Turns out the rods cost about £400 when all was said and done. Not too bad considering they'd cost about four times that over here!

[Andy335Touring]

bottom to prevent it puffing up

Suits you sir !

Is the 188 case the bigger of the ones the E30 had?

Yes

[jaistanley]

Those rods are a nice price. One day when I have plenty of cash (hmmmm and kate beckinsale decides she's been living a lie and comes back to england and moves in with me and at my mums house....) I'd like to build a low comp/high strength S50B30 bottom end and supercharge it to around 600 brake. They'd be all good for that....

Can you re-build diffs? Kevo on here has taken it upon himself to be Zone expert if not. There's info and how to's in the BMW service manuals I think. A 40% lock up 2.9 would be nice...

[suzie650]

Yes you can rebuild diffs, and yes you can change the lock up for both load and engine braking. (change in ramp angles)
Not sure that a 40% lock diff would be great on the road, though. You might scare yourself in the wet a bit...

[jaistanley]

Didn't mean 'can you'.. Meant can YOU... LOL.

I can't, but I'm sure I could learn.

[march109]

Alex you have PM re: £Â£Ã‚£'s !

[Turbo-Brown]

Would be interested to have a go at putting a new diff unit in myself, but would be worried about getting the preload between the gears wrong.

I'm really tempted to buy a Quaife ATB. Reckon that'd go well with the whole setup

[jaistanley]

There are certain models of Z3 and Z Coupé that you can rob the torsen type diff out of too. I'm sure they'd have the same bolt pattern on the LSD pack to crown gear. It might be cheaper than paying for a Quaife LSD. From what I understand they'll give excellent traction and handling but at the expense of a little tail out action.

Probably a good thing!

[Turbo-Brown]

Will keep my eyes peeled for a busted Z3 then I guess Gotta look at ratios though, needs to be around 3:1 ish to make the thing bearable on the motorway!

Feel like I've taken a medium sized step forward today, have finally welded the inlet trumpets in place and tacked the two halves of the charge cooler plenum together

Here's some pre-heating going on:




Welding on the little bit at the end:




All the trumpets in place:






The idle air boss (it's on a big plate because I made the walls of idle air boss Mk1 too bloody thin and it just burned away! Quickest way to remove the bloody thing was to use a hole saw and plate over the damage )




Couple of upstands to help prevent the plenum expanding under boost where it meets the core and also to make it easier to stick the inner and outer sheets together:




And finally, the plates tacked together

[appletree]

Looking good, think i'd put a few more braces in the plenum, in the small gap, just thinking about possible vibration/pullsation.

Read abit in daves "walkers workshop" about a elise with a supercharger running medium boost and it balloned (if thats a word) the plenum, think it said it was 2mm sheet and around 8psi boost

dont know what boost your thinking of running but i'am guessing more than 8psi

[Turbo-Brown]

Oh yes! Read the same article I think!

Going to drill a grid pattern of 8mm holes all the way through and weld an 8mm stick into each one to tie the sheets together

[appletree]

Ahhh i see, thought the two struts were it

[march109]

I don't want to spam your thread anymore than I have allready , but did you get to a post office today?

Guess what I've gone and bought too?

Oh and I'm looking at Metric Mechanics pistons for another block that has just decided it wants to have more displacement .

[Turbo-Brown]

Ahhh i see, thought the two struts were it

They're as much to make the plenum more manageable while it's being fabricated as anything else, think it'll be a pain in the arse having to make up the side panels etc with it welded onto the core.

I don't want to spam your thread anymore than I have allready , but did you get to a post office today?

Guess what I've gone and bought too?

Yo dude, sure did! Your rods should be with you early next week

What have you bought dude? I'm hoping it's a great big turbo Sounds like you're getting tooled up to make just about every combination of stroker

[march109]

I bought Iain Temple's old N2O kit and a M50B25, Still set on a SC for the 2.9, but if I win the lottery there will definatly be a compound charged N2O'd 2.9L M20 running the streets of Bournemouth, lets hope mu numbers come in!

And I've got to find something to do with my 3x 2.8L cranks and 2.7L crank.

[Tommo32]

just stumbled upon your thread and it just so happens that i work for holset!!! crazy eh.

[Turbo-Brown]

N2O eh

just stumbled upon your thread and it just so happens that i work for holset!!! crazy eh.

Blimey, you're no doubt about to become very popular

What do you do for Holset dude?

Welcome to the Zone too!

[Turbo-Brown]

Bit of a mixed bag today.

Finally finished this off




And made a little progress on the charge cooler.

Welded on a boss for the air temp sensor. Put this down by cylinder 6 as I reckon that'll be where the hottest air's to be found.






Made up three little pylons to stop the plates seperating (need at least another 3 of them but I've run out of suitable material)




Then bunged the whole lot under the bonnet to make sure it'd shut. Took a little bit of fettling but the bonnet closes without fouling now

[appletree]

What engine is that supercharger on? thats how i'am planning to do mine with the m62 but with the out let the other war round!

if you could spare a few pics of the mounting i would be very intrested!

[Turbo-Brown]

It's on a 318is motor (M42 or whatever they're called )

The original idea was to mount it round the other way but, with the M45 blower at least, it pushes the charger miles away from the block and also doesn't give any decent fixing points.

Here's the brackets which hold it all on anyway



Hope that helps dude

[Tommo32]

N2O eh

just stumbled upon your thread and it just so happens that i work for holset!!! crazy eh.

Blimey, you're no doubt about to become very popular

What do you do for Holset dude?

Welcome to the Zone too!

cheers. im a mechanical engineer. but moving into development and lab-ops later in the year which should be when the fun begins.

keep up the good work,

Tommo

[jkarran]

Going to drill a grid pattern of 8mm holes all the way through and weld an 8mm stick into each one to tie the sheets together

Looking good! Just a word of caution, I did this with mine (just one support, not a whole array) and the circular weld seemed oddly prone to cracking as the plenum moved about during finish welding. I assume it'll be similar under boost

Might just be my shite welding or something odd about the geometry of my plenum or some unfortunate mix of alloys. Worth a mention though.

[e30_Turbo]

N2O eh

just stumbled upon your thread and it just so happens that i work for holset!!! crazy eh.

Blimey, you're no doubt about to become very popular

What do you do for Holset dude?

Welcome to the Zone too!

cheers. im a mechanical engineer. but moving into development and lab-ops later in the year which should be when the fun begins.

keep up the good work,

Tommo

He he I got one too

H1C, Works quite well

[Speedtouch]

PPC magazine this month has a supercharged Morris Minor with that same Eaton M45 blower atop a 1275cc MG Midget engine The car still has front drum brakes too

[march109]

Cheers Alex, I recieved the rods and they are , If I wasn't so keen on building the engine I'h hang them on the wall and put the pistons on the mantle piece, it seems a shame to get them all oily.

[Turbo-Brown]

Ooh, that's possibly bad news JK! Fingers crossed that mine stay intact, having lots and lots of them should distribute the work they have to do though. Haven't cracked yet anyway.

Mark, you've gotta get your car on a dyno at some point mate! How much boost you running now

Supercharged Moggy eh? Now that sounds scary!

Cool, glad you like them Gareth Does seem a shame to bury them in an engine doesn't it!

Will have to take lots of pics of these engine builds to remember them by

[Turbo-Brown]

Been on a mate's stag do in Dublin this weekend so haven't had a chance to get much done, but decided to have a pop at positioning the large wastegate today.

It's going to have to go down by cyl 6 and I've had to lop the corner off the battery tray to get it in, but that should give plenty of room for a 3" down pipe, a 2" WG pipe and the bypass plumbing from the outlet of the small turbine.

Going to route gas to the WG along this pipe. The plan is to cut the pipe down the middle where it meets the manifold and have it take gas from the collector.




Just gotta go out and see how short to make the stub coming off the WG now so I can weld these bits together.

[Turbo-Brown]

Bleeeee, got the WG pipe stuck on today

Took all day to get all the bits to fit properly but I'm quite pleased with the result.

Started out by hacking the pipe in half and then chopping most of the top out of it too, figuring that it'd be impossible to seam weld on unless I did most of the welding from the inside.

Decided on the position the WG needed to take at this stage too.








Then of course it occured to me that I needed to be able to get a spanner and a nut in behind the top left hole of the exhaust gas divertor assembly so had to make this ugly looking thing to clear:




And finally spent about two hours fettling the end of the pipe so that the WG would sit in the right place, then welded it all in place.






Made a cap for the top before I went home and will make a turning vane to weld inside before the cap goes on too.

[Turbo-Brown]

Hooray!

It's finished

Made a turning vane for the entrance to the WG pipe:






Made a little brace to reduce the cantilevered load of the big heavy wastegate. It's just a vertical strip as I reckon both pipes will expand at different rates so the brace will need to be able to flex.




And here it all is in the bay:




Just about to draw up the outlet flange for the little turbo and order up what I think I'll need to make the bypass plumbing. Might actually have one of the major components finished fairly soon!

[appletree]

O/T but have you made a bracket to relocate the alternator jon the IS yet? i need one

[Turbo-Brown]

Think Ashley has found a solution to the alternator position. Has to lose the power steering though.