Does the M42 have forged Pistons?

[DannyKB]

Hi

Some say yes, some say no.

But can we find a definitive answer?

When I look at pictures they dont look forged to me?

Have anyone heard of m42 pistons failing due to high RPM?

Cheers!

[slocar]

As far as I'm aware, the crank is forged, the rest isn't.

What kind of RPMs are you trying to run? Stock, you should be good for about 7200-7300 rpm, and I have yet to hear of one fail at those revs.

[DannyKB]

OK, so its decided -not forged

I have a e36 m42 with turbo and MS3. Butt dyno says 220whp.

I want to upgrade to forged rods, and modify the pistons to a cr of 8-8.5:1, studs and head gasket.

The goal is 320-340whp but my concern is as you mentioned, if I could make good power with a max off 7000rpms.

I will keep tempetures down with water/meth.

What ya think?

- - - Updated - - -

I know you love pictures.

I will pull the engine out, make a new top mount (buttom mount sucks in so many ways), make new intake mount new intercooler. Remove egr and all other useless crap. And do a make over.

First small turbo external wastegate



Second turbo internal wastegate