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Compression ratio ver. compression lbs. ????

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1morgan

10-16-2005 06:34:08




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If my compression on a E- gleaner stock is 145 ibs., what would the ratio be. ALSO IF IT WERE 185 LBS. WHAT WOULD THE RATIO BE? THANK FOR HELP. 1MORGAN.




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Texas Denny

10-16-2005 06:52:34




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 Re: Compression ratio ver. compression lbs. ???? in reply to 1morgan, 10-16-2005 06:34:08  
Unfortunately, there isn't a formula that accounts for compression loss. Theoretically and neglecting temperature effects, compression ration should produce higher pressure by the formula P1xV1=P2xV2 which simplifies to P2=P1x(compression ratio) since V1/V2 is compression ration. Most tractors can only be used to 8.5:1 and therefore the theoretical compression would be 8.5 x 14.7 = 125. To get 185# compression, the ratio would need to be 12.6:1 necessitating premium fuel. Also, the pressure in the cylinder shortly after bdc on the intake stroke may still be less than barometric pressure since vacuum was necessary to fill the cylinder. When you are doing a compression test, this vaccuum is small. At running speeds, the vaccuum is much more significant.

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Kent of SW MO

10-16-2005 14:49:32




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 Re: Compression ratio ver. compression lbs. ???? in reply to Texas Denny, 10-16-2005 06:52:34  
The only way to find the compression ratio is to pull the head and cc the combustion chamber, The space above the piston as there is not a combustion chamber in the head. The find the cc's of the sweeped area of the piston and calculate the compression ratio.

Kent



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