WHICH PISTONS?? m20 turbo !!!!

Post Sat Nov 14, 2009 7:53 am

Hey guys I'm currently buildin a m20 325i block to turbo it usein standard internals arp head studs m/s standalone etc etc since I haven't put the pistons bk in yet I was wondering if any 1 knows of any other pistons which would be abit stronger than the cast m20 ones ?
I know the m50 m52 pistons will fit but are they stronger ? Will they take more boost?
How much max could I run the standard pistons? 8 to 10 psi?
I've heard so much that they will take this they will take that but then I've also heard the opposite that they won't take as much as I would like I'm only lookin at about a bar or boost and not going for out and out power but would just like to know if I did wind the boost up just wanna feel confident that the pistons will take it ?

Any info would be great
thanks guys

Post Sat Nov 14, 2009 12:35 pm

Not sure what spec they are but there is a set of low comp pistons for a turbo M20 in the for sale section.

Post Sat Nov 14, 2009 1:13 pm

cheers mate if ive seen the 1s your on about i think they are just standard facelift pistons which are lower comp anyway but thanks anyway

Post Sun Nov 15, 2009 9:02 pm

On A Standard Engine What Sort Of PSI Or Boost Can You Set......

Post Sun Nov 15, 2009 10:09 pm

completely stock later spec m20 engine has seen 1 bar of boost if im not mistaken ! that with a thicker H/G.. or no more than 10psi.. all depends on the mapping !!

Post Mon Nov 16, 2009 1:15 am

8.8:1 compression can run at least 350hp with ARP and stock head gasket.

Stock pistons can run to 500hp for absolute sure.

Post Mon Nov 16, 2009 10:04 am

Cheers guys Im not really 100% sure I have the late engine as I brough just the engine with no back ground on it wot do the piston crowns look like as I didn't get a head with it but I know I need a 885 head are the pistons dished with to valve cut outs?
And gunni I emailed ya over the weekend I don't know if you got it
thanks guys

Post Mon Nov 16, 2009 2:00 pm

Just read and replied.

Here are all the M20 pistons and their dimensions
http://www.bmwccn.no/rogaland/Mahle_m20.html

Post Mon Nov 16, 2009 2:07 pm

blingsta wrote:completely stock later spec m20 engine has seen 1 bar of boost if im not mistaken ! that with a thicker H/G.. or no more than 10psi.. all depends on the mapping !!

Gunni wrote:8.8:1 compression can run at least 350hp with ARP and stock head gasket.

Stock pistons can run to 500hp for absolute sure.

Thanks Fellas