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May 4th, 2007, 12:16 AM
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#1 |
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MM Fanatic
1991 Ford Mustang GT
Join Date: May 2007
Location: San Diego, California
Posts: 4,348
 iTrader: 0 reviews
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compression 9 to 1 VS. 11 to 1
My question is , if you have 3 high proformace engines all with the same parts and the only difference is the compression ratio, for example lets say the 9 to 1 compression engine has 225 hp, what would the horse power be at 10 to 1 and 11 to 1? is there a mathethmatical formula to this?
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May 4th, 2007, 12:59 AM
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#2 |
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MM Ninjas!
 
1990 Mustang LX
9.36@143 mph
Join Date: Jan 2006
Location: North Fond du Lac, Wisconsin
Posts: 11,375
 iTrader: 1 reviews
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It depends....
There is no formula that I know of. I've heard engine builders say 1 compression point is worth 20-25 horsepower but it really depends on the rest of the combination.
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My daily driver has 16 cylinders and 4400hp @ 1000 rpm....  ***1988 Mustang GT - Stock....almost 
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March 30th, 2010, 11:06 PM
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#3 |
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Newbie
Join Date: Mar 2010
Posts: 7
iTrader: 0 reviews
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good question im in the middle of a 351 stroked to a 408 running 11:1 with 61cc combustion chambers.
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November 13th, 2010, 03:10 AM
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#4 |
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MM Fanatic
1991 Ford Mustang GT
Join Date: May 2007
Location: San Diego, California
Posts: 4,348
iTrader: 0 reviews
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Any more thoughts ?
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 DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears |
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November 13th, 2010, 09:24 AM
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#5 |
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MM Fanatic
1991 Mustang LX 5.0
Join Date: Jan 2010
Location: Minnesota
Posts: 4,805
iTrader: 2 reviews
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Waiting 3 years for answers is some serious patience. I woulda bumped it a few more times, lol.
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A whole bunch of crap that makes the car go fast |
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November 13th, 2010, 10:06 AM
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#6 | |
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MM Fanatic
1991 Ford Mustang GT
Join Date: May 2007
Location: San Diego, California
Posts: 4,348
iTrader: 0 reviews
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 Ya when i posted this i never saw the answer. I forgot all about it. im still figureing out this site when i ran across it so i thought id bump it and see if i cant get it rolling. if it turns out to be a topic that know care about this time ill let it go. ha ha. 1slo5.0 gave a good answer and maybe its not going to get much better that
__________________
DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears Last edited by ryanw; November 13th, 2010 at 10:08 AM. |
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November 13th, 2010, 10:18 AM
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#7 |
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Premium Member
 
1969 Mustang Mach 1
7.324@94.61 N/A
Join Date: Aug 2006
Location: Oklahoma jackass, get to driving
Posts: 4,559
iTrader: 0 reviews
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There is no good answer, because it takes a lot different cam profile to run a 9:1 engine, than it does an 11:1 engine. So if you build the first engine at 9:1, and you bump that engine to 11:1, your combo will be wrong, therefore you will not get the most out of your newfound compression.
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 ProSystems Aeromotive TFS MSD Bullet Induction Solutions PA Moser |
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