compression ratio and horsepower question
compression ratio and horsepower question I just had a quick question - on a 408, what would the horsepower difference be between an 11.1:1 vs. a 10.9:1 - I was wanting a -10 cc piston, but all the shop has in stock now is a -12cc piston. I already have tsp prc 62cc 5.3 2.5r heads. should i wait for the other piston or will it only be worth 2-3 hp?
6 & 8 Second Club
Joined: Aug 2006
Posts: 2,284
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From: Illinois, RT 66 dragway area
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Less than that, don't sweat it. Compression does equal more HP, but 0.2 is not worth a second thought. 1, 2, or 3 full points will make a difference, not 0.1, 0.2 or 0.3.
Have fun, good luck.
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Less than that, don't sweat it. Compression does equal more HP, but 0.2 is not worth a second thought. 1, 2, or 3 full points will make a difference, not 0.1, 0.2 or 0.3.
Have fun, good luck.
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TECH Apprentice
Joined: Mar 2006
Posts: 326
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Originally Posted by nomorews6
I just had a quick question - on a 408, what would the horsepower difference be between an 11.1:1 vs. a 10.9:1 - I was wanting a -10 cc piston, but all the shop has in stock now is a -12cc piston. I already have tsp prc 62cc 5.3 2.5r heads. should i wait for the other piston or will it only be worth 2-3 hp?
I agree with mrdragster1970. A couple of tenths of a compression point or so won't make any real difference in power. Save the milling for another day when you might need to clean up the deck surface or if a little bit of warp develops in the future. If the head decks are flat, I wouldn't mill them.
Steve
Steve
Last edited by Steve Bryant; Mar 17, 2007 at 07:33 PM.
