How much power does adding compression make?
09-25-2007, 10:31 AM
#22
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ok i know that this is like maybe a dumb question not meant for hear. But can anyone please tell me the stock head specs, along with the gasket thickness so i can find the compression online with a calculator, and then play around with it like if i were to mill the heads or swap gaskets? ( stock ls1 241 heads from a 00' trans am)
09-25-2007, 10:34 AM
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ok i know that this is like maybe a dumb question not meant for hear. But can anyone please tell me the stock head specs, along with the gasket thickness so i can find the compression online with a calculator, and then play around with it like if i were to mill the heads or swap gaskets? ( stock ls1 241 heads from a 00' trans am)
Thanks SO MUCH in advance
Thanks SO MUCH in advance
09-25-2007, 01:01 PM
#24
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Originally Posted by Dragkid1917
ok i know that this is like maybe a dumb question not meant for hear. But can anyone please tell me the stock head specs, along with the gasket thickness so i can find the compression online with a calculator, and then play around with it like if i were to mill the heads or swap gaskets? ( stock ls1 241 heads from a 00' trans am)
Thanks SO MUCH in advance
Thanks SO MUCH in advance
09-25-2007, 04:59 PM
#25
riddle
Originally Posted by KCFormula
The best formula I have found is based on thermal efficiency.
E= 1-(1/R^K-1)
E is the thermal efficency, R is the compression ratio and K is the coefficient for the adiabatic (SP?) expansion of air. Which means there is a lot of factors that play into it but when done right a good rule of thumb would be about 3-4%.
E= 1-(1/R^K-1)
E is the thermal efficency, R is the compression ratio and K is the coefficient for the adiabatic (SP?) expansion of air. Which means there is a lot of factors that play into it but when done right a good rule of thumb would be about 3-4%.
09-26-2007, 08:28 AM
#26
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Originally Posted by tee-boy
What is thermal efficiency? What units is it measured in? If it is highly correlated w/ torque, then the answer to this riddle is to differentiate E with respect to R. The derivative will answer your question.
There are no units. Its a percentage of T.E. The goal is to find T.E. by estimating numbers on the other side of the equasion.
09-26-2007, 09:08 AM
#27
definition
Originally Posted by KCFormula
There are no units. Its a percentage of T.E. The goal is to find T.E. by estimating numbers on the other side of the equasion.
09-26-2007, 10:41 AM
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Never mind i found it, Now i have a question. If i mill the stock heads .040, or if i mill them .030 and put a .010 thinner gasket on, it sould raise my compression to 11.12 :1, that is assuming the base number in 10.1:1, which would mean the piston is down in the hole .005 at TDC, whick seemed to be of confusion because i read someone wasnt sure if it was .005 or -.008, which would change alot. Anyway 10.1:1 sounds right. So if i did this, can i still run 93 pump gas without detonation? And is it safe to run that clearence with a 233/239 .598/.603 112lsa? And... with 233/239 .616/.621 112lsa?
09-26-2007, 11:18 AM
#30
FormerVendor
Efficiency is usually defined in terms like BSFC as in Brake Specific Fuel Consumption or another words how much power do make while consuming X mass of fuel per unit time. There is also BSAC or Brake Specific Air Consumption or another words how much power do make while consuming X mass of air per unit time. Of course they are related through the A/F ratio.
09-26-2007, 03:29 PM
#31
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My own personal car picked up .22 in the eighth mile going from 10.3:1 to 11.9:1, all I did was mill the heads. That equates to around 20 horsepower out of 6 cylinders. FWIW
