Something I've been wondering. Given the same two motors with the exact same setup, one with about a 9.0-9.5 (something a blower/turbo could go on and work well) compression ratio, and the other with about a 11.0-11.5 compression ratio for N/A. Feasibly, how much of a power difference are we talking about???

Reason I ask is that I *may* be looking at a rebuild shortly if bad news comes on my car. That said, I want to go power adder in the not to far future, and would like to have a motor in place rather than rebuild another one.

Asked this here because I figured I'd get a better answer and it might be useful. Mods move if you deem necessary!!

 

It's going to effect your cam selection more than anything. The higher compression motor can take more camshaft and still be a "street" car. Meaning it will be driveable.

If you build it for a blower and put a blower cam in it, it's bascially going to be unimpressive NA but work really well on the blower.

Bret

 

I was thinking of something like a 224/236, something that's ok on N/A but is ready for a blower. Or, a cam swap prior to a blower/turbo isn't that big of a deal.

Say I go with an 847 or even keep the 224/230. Feasibly how much would I cost myself by going with the lower compression ratio??

 

Powerwise not as much, but power and driveablity you will suffer on both a large amount.

 

with the exact same setup, one with about a 9.0-9.5 (something a blower/turbo could go on and work well) compression ratio, and the other with about a 11.0-11.5 compression ratio for N/A. Feasibly, how much of a power difference are we talking about???
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approx 10.0 hp to as much as 26 hp gains per point in CR

 

So what I'm understanding here is that I could be leaving 50ish HP worst case on the table by going N/A with a 9.0 compression ratio. AND driveability would be affected?? Dang, this is going to be a descision.

 

So what I'm understanding here is that I could be leaving 50ish HP worst case on the table by going N/A with a 9.0 compression
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"ONLY" => if "no" detonation occurs , octane and timing curve are correct for your application