vinyl_tien

I am consider build a 3.8 L engine, a 3.2 and 3.0 engine, which one will be a good platform?
Need you guys advice! Many thanks!

porsche0nut

I've heard of builds of 3.4 and 3.5L, starting with a 3.2 base, but never a 3.8. I think it would be very difficult to make the cylinders that large and still have enough wall strength.

Why 3.8L?

Take a look at the forum "Impact Bumpers". There are a lot of engine build threads on there starting with 3.0 and 3.2L engines.

Whatever you end up doing, make sure you document it here with lots of pics! Good luck.

whalebird

I would say 3.2 for sure, but 3.8 is big. Twin plug ignition is a must. The chassis you choose to put this motor in will be a factor as well. You may be better served to start with a 3.6 based car/motor. Regardless of the platform you choose, to get the most from your project you will have to address cams, heads, intake and exhaust, as well as transmission type/gearing.

earlyapex

A 3.6L motor would be a much better place to start.

NineMeister

Fit a 3.6 993 engine. Worked for me: the motor in my G50 Carrera runs Motec, makes 308hp on regular 95 octane fuel and gives 30mpg on a run.

Seriously, it will cost you double to convert a 3.2 engine to 3.5 or 3.6 and you will end up with a lot less power and efficiency against fitting a remapped stock 3.6. Then, if 300hp is not enough for you, tuning the 3.6 engine is a lot more straightforward.