Power loss vs. compression reduction : Rule of thumb?
01-16-2004, 08:49 AM
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Power loss vs. compression reduction : Rule of thumb?
Has anyone ever figured out a rule of thumb or something similar for the power loss you get when you drop the compression ratio? Does it work proportionnaly for boost too?
For example, I have a B16 with 9.0:1 compression, down from 10.2:1 stock. Bore is the same. Assuming it makes ~140whp stock, how much do you think it would make now, and can you assume a similar reduction percentage when boosted from what it would do if it had stock compression still?
I hope it makes sense! Thanks!
For example, I have a B16 with 9.0:1 compression, down from 10.2:1 stock. Bore is the same. Assuming it makes ~140whp stock, how much do you think it would make now, and can you assume a similar reduction percentage when boosted from what it would do if it had stock compression still?
I hope it makes sense! Thanks!
01-16-2004, 11:56 AM
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Re: (JO)
Was that @ me? If so what I mean is the small amount of power you will lose by droping compression will more than make up with the higher boost you can run..
01-16-2004, 12:11 PM
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Re: (Overblown-Teg)
No that was for b18c1boosted. The intent of this thread was to get an idea as to what kind of difference you will observe on 2 similarly boosted set-ups @ the same psi with the only difference being a compression drop. 
I know I can crank that sucker up.
I know I can crank that sucker up.
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01-16-2004, 12:17 PM
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Re: (JO)
Pick up the new drag sport mag. it talks about forged pistons. it has a chart and i baisically says if your original comp was 10:1 and you drop it to 9:1 you will lose 2.8% at the some boost level but you get a larger margine in tuneing error.
01-16-2004, 12:40 PM
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Re: (kpt4321)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote »</TD></TR><TR><TD CLASS="quote">If you're going to leave the boost at the same place, then why would you lower the compression?</TD></TR></TABLE>
Argggh! I was curious that's all, that was an example, I just wanted to have an idea of what kind of power reduction per point of compression drop you'll typically see.
b18c1boosted, that's exactly what I was looking for, thanks I'll look up the mag.
Argggh! I was curious that's all, that was an example, I just wanted to have an idea of what kind of power reduction per point of compression drop you'll typically see.
b18c1boosted, that's exactly what I was looking for, thanks I'll look up the mag.
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