M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Swaps, Turbos, Buildups => Topic started by: nickmpower on November 13, 2006, 06:55:50 PM

Title: pistons/rods
Post by: nickmpower on November 13, 2006, 06:55:50 PM

well im at another delima.

I called metric machanic and they said that it is not a good idea to run boost with the non interference valve pockets, even if its only 7lbs. im not even sure if i would end up geting a dasc, but id really like to keep the option open

they have one setup with 8.5 compression and one setup with 11.5 compression. It seems like neither would work for me.

I would like to have the compression at around 10 and deep valve pockets to make the engine non interfernce but it looks like that might not be possible.

maybe i should just order some rods and pistons from somewhere else? the problem with that is i dont know what the specs would need to be to give me what i want.

can anyone help me out here?

Title: pistons/rods
Post by: silverblades181 on November 14, 2006, 02:03:00 AM

the M42 has 10:1 compression stock :p

Title: pistons/rods
Post by: GuySchalnat on November 15, 2006, 10:50:16 PM

But you may want less compression then stock.  Depending upon what boost you want to run, you may even get a non-interference engine, better compression for your purpose (so you don't have to retard the timing so much), and stronger internals.

In general, I'd think this is less about BMW's and more about building engines.

-Guy

Title: pistons/rods
Post by: 2002maniac on November 17, 2006, 02:41:29 PM

I would buy the 11.5:1 setup from them.  If you want boost in the future, get a thicker headgasket to lower the CR.

Title: pistons/rods
Post by: nickmpower on November 17, 2006, 04:56:05 PM

yeah but according to them the non interference pistons will melt with boost. I dunno. I might just get some 10:1 JE:s and call it good. that way a dasc will be no problem.

i dunno...

Title: Pistons Question !!!
Post by: vatos_p on November 24, 2006, 11:02:27 AM

hello , i am wondering about a thing i heart about the m42 engine pistons , that is has almost exact piston size as the lancia delta intergralle 16v turbo , and i am wondering if it is true...

could someone tell me the exact size of 318is m42b18 engine ? and the lancia delta intergralle 16 turbo piston size , because if it fits then..........







thank you , and i am really sorry about my english but i am from greece...

Title: pistons/rods
Post by: cecotto on November 25, 2006, 09:34:47 AM

Quote from: vatos_p;14378

"..... m42 engine pistons , that is has almost exact piston size as the lancia delta intergralle 16v turbo , and i am wondering if it is true..."

At http://www.mahle.com you can find piston details:

I looked it up and here are the specs that i was able to find: