twin turbo 331 ????

[PKRWUD]

Originally posted by 91GTturbo


Chris,

I assumed since the original topic delt with a turbo, we were talking intercooled boost. I don't think you ever specified in your posts that you were only talking non-intercooled boost. Now that we have that straight, I totally agree with you. If 429 builds a 331 with an intercooled turbo setup, he will easily be able to run 10 - 12 lbs on pump gas.

You should be a dignitary somewhere. No one has ever been so cordial with me when disagreeing.

Truthfully, I kept thinking he was talking about a blower, but the same rules apply. Yes, with an inter-cooler he will be able to sustain higher levels of boost, but I still don't see 12 pounds (sustained) on pump gas with 9:1 compression. Maybe, but I wouldn't recommend it. That's just me, though.

I have become a firm believer in lower compression for boosted engines. The lower your compression, the more boost you can safely achieve. Think about it... If you go with 8:1 and find some A/V gas, you could easily reach 15 pounds. At 15 pounds of boost, that 331 suddenly has over 670 cubic inches of displacement. That's what I like.

Make sure you get blower pistons. They're stronger, and are less likely to crack the skirts.

Take care,
-Chris