Quote:
Originally Posted by wnta1ss
My opinion is, if you are only going to have LT4 fuel parts with a cam lobe, running E85, then you will not be able to run enough boost to justify lowering the compression ratio (due to limited fuel supply). Lowering the compression ratio actually makes the engine less efficient, and you'd need to then up the boost just to get back to where you are right now. So unless you are doing a setup to run quite a bit of boost, I think that lowering the CR would be a step backwards. Therefore, with the parts and fuel that you're listing, I think that the drop-in pistons from Vengeance Racing (stock CR) would be a better choice than the lowered-CR pistons.
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Intuitively I agree. In most cases, compression is definitely a good thing, especially on DI motors. I just want to get inputs from others with more experience. I've done numerous NA builds over the past 40 years but am still a newbie regarding forced induction. I wonder why the lt4 has lower compression given it's modest amount of boost?
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