horsepower < > compression = ?

[bscottie]

anybody know a resoure to determine what effect lower/higher compression will have on horsepower with all other pieces staying the same?

 

[Marc s]

Every point of compression is worth around 2% gain/loss in HP.
www.wallaceracing.com/hp-cr-chg.php

 

[SteveP]

i am having my motor bumped up from 8:5:1 to 9:5:1 so i can get more power from the motor and blower

 

[bscottie]

Every point of compression is worth around 2% gain/loss in HP.
www.wallaceracing.com/hp-cr-chg.php

cool, thanks

 

[stang67gt]

sorry to jack your thread but just out of curiosity, why do you want to raise compression instead of turning up the crackpipe. i can only assume that you want a more effiecient engine off boost or are running something higher than 93 octane. just wondering what your decisions were to bump up compression.

 

[spyder7724]

Every point of compression is worth around 2% gain/loss in HP.
www.wallaceracing.com/hp-cr-chg.php

I read in one book that said in the lower ranges it can be as much as 4% then at around 12:1 it decreases rapidly like to about 1% per point so i think what they were saying is that the HP gains decrease as the compression increases.

 

[bullitt boy]

What would be the "best" compression ratio for vortech H/O planning on about 13/14 lbs boost with pump gas? Meth kit suggested?
planning on a forged rotating assembly in stock block 4.6 . Already running vortech non intercooled 10 lbs with no troubles looking for more power with insurance of forged.

 

[Bingo]

sorry to jack your thread but just out of curiosity, why do you want to raise compression instead of turning up the crackpipe. i can only assume that you want a more effiecient engine off boost or are running something higher than 93 octane. just wondering what your decisions were to bump up compression.

+1...

 

[Kiddigretarzz]

What happens then to the HP calculation when you lower the compression to 9.1:1 but stroke the motor to 298(4.8L)?

 

[US-1]

Well this should be fun to watch.

 

[MexGT]

What happens then to the HP calculation when you lower the compression to 9.1:1 but stroke the motor to 298(4.8L)?

I think its a rule for any gas engine, not for 281 specific or a determined c/i

 

[Kiddigretarzz]

I think its a rule for any gas engine, not for 281 specific or a determined c/i

I´m aware of that, I only used the numbers as an example.

 

[pacettr]

Well this should be fun to watch.