supercharged M10

[lance1a]

Hi, I thought that I would share the following info about blowing my M10 1.8L E30. So far I have ditched the Pierburg carb in place of a Bogg Bros Suzuki GSXR Mikuni carb and manifold conversion, re-jetted to suit the car. well more or less anyway! After buggering about with the fuel pressure (2PSI from Sytec adjustable regulator) and main jet needle depth, I am almost there. Gone from getting 15/18MPG to about 24mpg urban. Still a bit rich but rather that than lean. the next step is the blower. I have been looking around the scrappy for a plenum to use to feed the carbs but might end up modifying my old M40 inlet to suit (by cutting off the inlet pipes close to the plenum chamber) or make one up from carbon fibre around a polyurethane mock-up. The Eaton M45 seems to be the best option as I only want the thing to run at about 5psi anyway. Centrifugal blowers are scarce and expensive but would be my first choice. Although I know the rootes type blowers better after having had them on my Lancias. Trying to find out if a Turbo dump/ recyle valve will do the trick of replacing the Bypass usually found on the Eaton, anybody know? Also looking for the formula for working out the new carb jetting. Do I work out the theoretical volume (1.8L at 5psi should be about the same as 2.4L) with the blower or keep to the current set up. I might have to dyno it and hope for the best. Considering the Schrick 284 cam but need to know if this will cause valve overlap and negate the point of the blower? Any input will be most appreciated by you guys. regards.

[appletree]

Hi i am using the eaton m45 blower on my M42 (318IS) its in the relitively early days of the project. take alook


http://www.e30zone.net/modules.php?name ... ic&t=51070


As regards the Bypass i think you only realy need this for better MPG and to use as a pressure relief valve. I am going to use a dump valve to makea bypass so on say half throttle the engine will be in vacume and suck the dump valve open makeing a link between the S/C inlet/outlet which will let the S/C "free wheel" and so this means it wount be working its bollox of trying to such against the throttle body and so SHOULD use less power making better MPG.

I was also looking at using a turbo actuator and waste gate to work as a pressure relief valve as the manifold pressure increases.

hope that help with your project.

have you found any good sites regarding the fitting of a M45 to anything!! as most of the site i look at its all people just talking about it but not doing it!

[lance1a]

hi, Mogsport and Old Car New Tech have a small article on the M45 and there are a number of US sites too. but most of the emphasis seems to be on turbos. I also read something about Garrett Turbochargers switching to a new supercharging technique. Lancia ran a very similar set up to the Eaton on all the VX cars, with no form of bypass at all. I will be calling BMW (Hams Hall) in the morning to see if I can get a scrap blower (I work for BMW)with cosmetic damage only, that way I am hoping to be able to get the complete unit, ducting-intercooler and bypass intact. I will re-post later in the week as things progress, hopefully! Ordered both Corky Bell's and Street Supercharging books from amazon (second hand/new)for just over £20.00 incl postage. well worth it I should imagine.

[jkarran]

I'm building a blown R1 (Yamaha - yeah I know it's not a BM or even in one ) engine using the Eaton M45, Like Appletree's it's still very much ongoing rather than done.

I wouldn't bother with a cam to begin with, mild stock will be better than putting a wild NA cam in and losing your boost to bigger overlap. I presume M10 is a SOHC engine?

Not sure about the carb jetting but you will need to pressurise the float bowls to plenum pressure. You will also need a FPR referenced to plenum rather than atmospheric or inlet pressure. Check out turbo bike sites for hints on blow through multicarb setups, there's loads of turbo'd drag bikes about.

You will also need to make sure the carbs are robust enough to withstand shutting against the boost without bending the butterfly spindle and sticking open

Roots boost is controlled by pully selection and a blowoff/bypass valve, see appletree's thread it links to oter roots conversions people have done. Currently I'm planning on using a recirculating dump valve as a bypass, it should work in theory but the manufacturer had concerns over the harsh response they can give in roots applications. If need be I can electronically modulate it maybe to calm that down or build a more progressive bypass valve, we'll see.

Hope that helps a bit,
jk

[lance1a]

HIya! Well, it seems that the blower is impractical to use with the Suzuki carbs due to the pressure increase in both fuel and air. Collapsed floats, and destroyed carb slides would be the result apparently! So this left me with one option. A draw through system. problem is I can then only use one carb (weber DTML Downdraft) and can't use an intercooler. so the whole idea becomes less appealing budget and power gain wise. It could be done but would it be worth it? So I am keeping my eyes open for a M42 motor and box with all the fiddly bits, and will flog the Brand new Eaton Cooper 's' blower to pay for it. I still have the Eaton m45 SLK blower which is a more compact and better laid out system anyway. I will have the A reg 735i on my driveway all the time, tempting me to rip it's guts out and transplant them, but sheeeeit! thats a big job! The car is up to 24mpg at the mo, and is feeling pretty frisky for what it is, so it's not all bad!

[jkarran]

Why not just switch to stronger carbs or throttle bodies, there's loads of bike bodies (no floats) and carbs that will withstand significant boost.

Check out the drag bike websites to see what they're using, some of them run crazy boost

If my slides bend and stick I paln to glue them up out of the way and just use the butterflies (03 R1 had vacuum opperated slides and manually opperated butterflies).

jk

[m-dtech]

jenvey direct to head throttle bodies ?

[jkarran]

http://cgi.ebay.co.uk/04-06-yamaha-R1-t ... dZViewItem

VS

http://cgi.ebay.co.uk/JENVEY-THROTTLE-B ... dZViewItem

10x the price The Yamaha ones will need some modification, I think there's a second servo controlled butterfly IIRC in the 04 TBs that'd need to be binned.

jk

[bigkev]

those are the newer R1 bodies that are siamesed together you might be better of with this type, He says they are R6 ones but i,m sure they are older R1 type with the pistons but you could remove them altogether as jkarran says the main advantage with these is you can space them apart as you want to easily as this guy has done with a bit of threaded bar
hope that helps

[Toby_Unna]

lance1a

is this your engine?

[lance1a]

Hi, yeah, that's before i managed to get cone filters and tidy it up a bit. Where did you find the pic? regards, rob.

[lance1a]

Oh , sorry I didn't read who the post was from, so now I know where you got the pics! Decided to fit 292 cam and have head work done and a header made up at Tubetorque. Will find another suitable and more cost effective candidate for one of the superchargers, like a Tii or similar at a later date.