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Relief valve bouncing causing pulsing

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Sun Dec 18, 2011 2:20 am Post subject: Relief valve bouncing causing pulsing

I have recently tried the 4th shape of valve plug. Picture attached and for Yahoo find it at:  

http://groups.yahoo.com/group/jabiruengines/photos/album/439839736/pic/133555367/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc  

The new video shows clearly the effect of the taper and the smoothness of the pressure in the system, compared to the original.  

http://www.youtube.com/watch?v=jhOQmBQctHA&feature=youtu.be  

Original flat top:  

http://www.youtube.com/watch?v=q_TCQtrfUHc&feature=related  

Given this is the same engine I hope that those that suggest the pump puts out the pulses will now see it isn’t the case.  

I plan a slightly more tapered plug as the final design. The blunt end will still ensure ‘relief’ properties while the taper will ensure the smooth pressure control that will stop cooler damage and wear on pressure senders.  

 Unfortunately it can’t stop leakage through engine casings so my engine still needs to be split. The healthy pressure in the video drops back when the engine is warm and at tick over I only see 10 psi. The joys of Jabiru ownership…..  

Regards, Clive <<4 shapes of plug.jpg>>

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