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jptook(at)jptook.cnc.net
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 Posted: Fri Aug 24, 2007 9:46 am Post subject: JabiruEngine-List Digest: 9 Msgs - 08/21/07 |
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Topic: Static RPM on a Jabiru 3300 with Sensenich Carbon
Fiber Adjustable Prop on a 601XL
I have an older Jab 3300 with low (50 +/-)hours, solid lifters. I have
recently changed out my original Bing Carburetor with a NOS Bing without
the 'Economizer' change. The difference has been dramatic, a top RPM
increase of 200RPM without any change to Prop setting. My question is
this: what should the static RPM be? What is the prop setting used by
most on a 601XL with Jab 3300 on a 601XL, and what are the
RPMs/indicated airspeeds seen with these settings?
Many thanks in advance.
Ed Gmerek
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Peter H
Joined: 20 Mar 2007
Posts: 197
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| Posted: Fri Aug 24, 2007 3:09 pm Post subject: JabiruEngine-List Digest: 9 Msgs - 08/21/07 |
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Ed watch out for excessive EGT with the new set up. I conducted a lot of
experiments with the Bing/econ carb supplied and found that with the mech
pump feed the float needle valve seat (2.25mm) leaks causing excessive rich
mixture and loss of performance above 2750RPM but EGT was only 620 deg. I
then fitted the smaller seats recommended by Bing for pump feed (1.5mm) and
saved 5LPH with marginal but OK EGT but even this seat leaked when the
electric boost pump was started, back to 37LPH.
I think you need to monitor EGT if departing from the original settings.
Peter
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