750-800hp 944 S2 3L 16v

[Thom]

Thank you for reminding these basics of engine design.
I don't see the point in building an oversized engine if we can't put the power to the ground, at least on a track car that is supposed to perform in lap times. If a destroked engine can make the same power, and that would be with the same peak torque as a stroked engine but at a higher rpm, then it should be more reliable and more responsive.
A well built engine should be able to run on full load without holding it back artificially with the tune.

You don't want to use stock S2/968 104mm pistons with a turbo, as turbo pistons are conical to allow for increased thermal expansion.

[Breizhtetics]

You don't want to use stock S2/968 104mm pistons with a turbo, as turbo pistons are conical to allow for increased thermal expansion.

Of course, i was thinking of wossner who offer forged piston for S2 and 968 with 10.9 rv. Some of the retailler say there are meant for turbo application so i think i will go with that on my build

[adonay]

Are you sure you want 10.9:1 CR on a turbo engine . If you plan to run pumpgas and not E85/Racefuel you will have avery narrow tuning window with an engine that is prone to detonation. New direct injection cars may get away with it but you might want to limit the boost with such a setup.

Also a 3mm gasket sounds like the wrong solution with high boost. Wossner will make other pistons than what they have on shelf i would email them and ask.

[Tom]

If your goal is maximum HP, why in the world would you de-stroke the 3L?

Those engine produce a lot of torque, and if you want the maximum hp, the massive torque in response create too much stress on the crankcase

(This is what happened at 946hp 966Nm)
IMG_2924.jpegIMG_2923.jpeg

Reducing the stroke means less torque for the hp, means more potential hp

The second added value my eyes see is that reducing the stroke also reduce the compression ratio, and with a 2.5L crank in place of the 3L and a 3mm cometic headgasket you now have a compression ratio of 8:1 with piston meant for 10.9:1
So no more need for costum made piston

At those power levels, some of the pro's pin the girdle better to keep it from shifting under load and breaking things...

https://performancedevelopments.com/por ... r-upgrade/