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-   -   Compression/cylinder? (https://www.ft86club.com/forums/showthread.php?t=82746)

Amir Ghadiri 02-20-2015 01:25 PM
Compression/cylinder?
 
Anybody know how much compression our motors should be showing per cylinder? I checked on ProDemand and it's showing 167 PSI min, 254 PSI max, 29 PSI max variance. Can anybody confirm this?

Thanks

350matt 02-20-2015 01:30 PM
when I checked mine it was about 180psi on all cylinders

Amir Ghadiri 02-20-2015 01:34 PM
Quote:
Originally Posted by 350matt (Post 2140695)
when I checked mine it was about 180psi on all cylinders

That's what I thought it should be at, thank you!

stugray 02-20-2015 02:17 PM
14.7 PSI (atmospheric pressure at your altitude) * 12.5 (86 compression ratio ) = 183.75 PSI.
So that is the number that you should never be able to exceed with "static" CR (cranking it).
At full speed, the "dynamic CR" is different.

Amir Ghadiri 02-21-2015 03:23 AM
Quote:
Originally Posted by stugray (Post 2140788)
14.7 PSI (atmospheric pressure at your altitude) * 12.5 (86 compression ratio ) = 183.75 PSI.
So that is the number that you should never be able to exceed with "static" CR (cranking it).
At full speed, the "dynamic CR" is different.

Thank you very much, I appreciate it!!


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