Speed,Combat,Scale,Racing > Rat Racing and Team Racing

Crankcase pressure

<< < (2/2)

Ron Duly:
FYI: 1 PSI = 51.71493256 mmHg.  Why did I want to know this?  I found a pressure gauge from a blood pressure tester that is calibrated in mmHg, with a range of 20-300 mmHg, which is low pressure.  I can now test a Perry pump and see how it compares to Bill's results.  If the pump pressure is in the 1.4 to 1.6 psi range then I can try the large Perry pump carb with crankcase pressure.  All this is for my Nostalgia Class 1 Navy Carrier plane with a K&B 40 R/C engine that doesn't have room for the rear mounted pump.  Stay tuned!

C.T. Schaefer:
Ron, I found that case pressure can work with carbs, including the Perry Carb. However it will not work without a good exhaust valve because when you close the carb to idle the pressure goes to 0 or less.  I used the exhaust to control idle speed and the carb as a fuel meter. The carb  would be about 1/4 to 1/3 open to maintain pressure. This worked well enough to  set the class 1 record (breifly) and gain P2 at the Nats in '87.  Keep us posted!

Navigation

[0] Message Index

[*] Previous page