Questions about m10 s14 stroker

[tbruz]

Yea I've heard of a few people running 93mm pistons in an m10 block I'm pretty sure

[thebutterson]

thebutterson - You CANNOT run 92mm pistons in an M10 block.

92mm is what Metric Mechanic uses in their m10 builds.

http://www.metricmechanic.com/pdfs/metric-mechanic-prices-2008.pdf

Also used by Top End Performance

http://www.racetep.com/bmwngin.html#02c

[Hey_You]

From what I have read, 91mm is about the max you want to run with a Forced Induction setup in a m10.

[SkiFree]

92mm is what Metric Mechanic uses in their m10 builds.

http://www.metricmechanic.com/pdfs/metric-mechanic-prices-2008.pdf

Also used by Top End Performance

http://www.racetep.com/bmwngin.html#02c

Yea I've heard of a few people running 93mm pistons in an m10 block I'm pretty sure

I'm sorry, it's a little hard to take you guys seriously. Go for a 92mm or 93mm bore while boosting it, I am by no means stopping you (and it's not worth arguing).

[deutschman]

Alrite, I mite see if I could contact him somehow. I'm doing the work myself. I just want solid parts and a proven build. I don't wanna put it together being a mystery what it's going to do the whole time.

Definately call JP. He is a really nice guy and knows what he is doing. I live about 5 minutes from his shop. I saw that motor Andrew posted a picture of. It amazing. When The air box is removed you can see strait down the intake runners to the valves. Beautiful. :D

[thebutterson]

Go for a 92mm or 93mm bore while boosting it, I am by no means stopping you (and it's not worth arguing).

You said CANNOT, not "should not if you're boosting". Feel free to post up what you think should be done, what you've seen work/not work. Nobody here is claiming to know the absolute best method of going about an m10 turbo build.

[SkiFree]

You said CANNOT, not "should not if you're boosting". Feel free to post up what you think should be done, what you've seen work/not work. Nobody here is claiming to know the absolute best method of going about an m10 turbo build.

You have a point, I'm sorry for not being a little more forthcoming.

Once you start passing 91mm, I'm of the opinion that the gains don't justify the sacrifice of the cylinder wall thickness. I actually recommend to just go to 90mm bore for extra insurance (but still one mm overbore). If you are looking to squeeze everybit of horsepower then, sure, go 92-93mm, but the reality is you won't feel much seat-of-the-pants difference and simply end up sacrificing engine longevity.

I understand that this is a lot of conjecture and I'm not bringing hard numbers to the table, my point being opinions will vary.

[reelizmpro]

I understand where you are coming from Ski. There are very minimal gains to be had from increasing bore size vs stroke. The closer you are to max bore the more problems. I only went 1mm overbore on my S14. M10 blocks are more common and a lot cheaper though.

[petrolhead]

thebutterson - You CANNOT run 92mm pistons in an M10 block.

Yes you can. It's just that a M10B18 block might/will crack. Just need to find a block cast before 1979 or so.
Last time I checked Ebay the B23 (84mm) cranks were 750€ or so, and a new crank w/ bearing shells is 1300€ around here. Pistons would have to be with ~40mm compression height, if one is using stock M10 connecting rods.

[tbruz]

Cool cool, yea I checked out a lot of 2002's yesterday at bimmerfest. A lot of different set ups but I think one of my favorite has to be a 2.2 m10 set up with the ti block. I'll do more research on it when I get home but I'm thinking thats what I'm going to do for the bottom

[Hey_You]

I'm telling you man, don't throw a bunch of money at the m10, you have a 2.7i that would like the boost better than an expensive overbuilt m10 (we met at the Gilroy caravan). Get a standard 2.0L block from a 2002, slightly build the 318i head (double valve springs, HD rockers, and maybe a cam if you feel) and you should have around a 8.0:1 CR setup to throw around 20-30 lbs of boost at. That should be good for around 300-350 rwhp from a HX35 (your Precision should be around that)

[tbruz]

Yea I thought ab boosting my 325 but idk I think the m10 would just be more fun for a starter. Pulled the motor today I'm boutta start putting together a parts list pretty soon! Dude what happen to you on the way down? I saw you pull off but I couldn't hear shit on the radio.

[Hey_You]

Yeah, radio's were shit. Front bolt on my fuel rail came loose, and started spraying fuel from the top of the front injector. Fixed that in about 2 minutes (brought a nearly complete tool kit with me, haha) but later had some more driveability issues (tracked it down to a loose reference wire on the starter) and ended up loosing the group. I think I missed where you all turned off for lunch

[tbruz]

Yea it was cool, after lunch everybody kind of scattered anyways haha. But it was coo, should have gotten ur number so we coulda mobbed around after all the festivitys haha

[tbruz]

Well I have been talked into just building a m20b25 to boost