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DISCUSSION => Swaps, Turbos, Buildups => Topic started by: halcron on September 07, 2008, 10:23:16 AM

Title: Help! My Goal for a 2 bar Boost engine
Post by: halcron on September 07, 2008, 10:23:16 AM

I am planning to rebuild my M42 motor into something that is able to hold 2 bars of boost.

The first part is to bore up the motor to 2L using 86mm pistons (Read from ludiagsm's thread that wossner pistons are fine for 2 bars of boost).

The 2nd part is to stroke up using the popular 2L diesel crank and well as forged conrods. I am hoping for a compression of perhap 8.5:1 to be able to boost to 2 bar safely.

Now, the main question is what combination of parts can I use to be able to get to 2 bars w/o blowing up the engine? I am leaning towards MM parts but they listed their motor for 250-300HP only. I estimate thats only around 1-1.2 bar of boost. Tried emailing them several times regarding the max boost the parts could take but never did get a reply. I don't live in US thus calling them is quite difficult.

Thanks for the help!

Title: Help! My Goal for a 2 bar Boost engine
Post by: rob_e30 on September 07, 2008, 10:50:26 AM

It's going to be less about the components and more about the ECU, tune, rev limit, how you plan to run it (street, drag, road race), and what else you're doing to make the system work.  Custom pistons, forged, balanced, shot peened rods will help get you there.  

Good luck