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                           JabiruEngine-List Digest Archive
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                     Total Messages Posted Sun 12/18/11: 1
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Today's Message Index:
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     1. 02:21 AM - Relief valve bouncing causing pulsing  (James, Clive R)
 
 
 
________________________________  Message 1  _____________________________________


Time: 02:21:41 AM PST US
Subject: JabiruEngine-List: Relief valve bouncing causing pulsing
From: "James, Clive R" <clive.james@uk.bp.com>

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/1
33555367/view?picmode=&mode=tn&order=ordinal&start=1&count &d
ir=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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