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Author Topic: Crankcase pressure  (Read 1244 times)

Jim Roselle

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Crankcase pressure
« on: May 22, 2017, 07:02:44 PM »
Hey all,
 
 I want to experiment with running one of my norvels on crankcase pressure from a tapped backplate. Is it necessary to run a check valve between the pressure fitting and the tank?

 Thanks,
Jim

Offline Paul Smith

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Re: Crankcase pressure
« Reply #1 on: May 23, 2017, 07:24:47 AM »
We almost always ran without check valves.  It's a good idea to pinch the pressure line or pull it off during refueling to prevent filling the crankcase.

As long as you treat the system like a bladder you shouldn't have a problem.  That is to say, keep the line pinched until the engine fires.  

A check valve won't protect you from flooding the engine through the venturi if it takes a long time to get started.

If you build the tank into the plane be sure to pressure-test it well before installation.
« Last Edit: May 23, 2017, 01:34:36 PM by Paul Smith »
Paul Smith


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