In a message dated 96-10-11 21:30:07 EDT, you write:
<< To a first approximation, take your compression ration and multiply by 15.
Atmospheric pressure is about 15 PSI (14.8 is "normal"), so for a 10:1
ratio,
you should see close to 150 PSI. >>
Good suggestion -- that approximates the maximum ABSOLUTE pressure in the
cylinder. To get even closer to the maximum gauge reading you'll see from a
"perfect" cylinder, remember that the gauge shows the pressure differential
between the inside of the cylinder and the atmosphere. Therefore, the
DIFFERENTIAL equals:
(Atmospheric Pressure X Compression Ratio) - Atmospheric Pressure
A 10:1 compression ratio thus should yield (14.8 X 10)-14.8 or about 13.3
PSI
-Karl
|