wingdingy(at)gmail.com
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 Posted: Thu Aug 12, 2010 7:06 am Post subject: JabiruEngine-List Digest: 5 Msgs - 08/11/10 |
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| Quote: | >>> Another consideration is the fuel rate at the new RPM. It would be interesting
to see your full throttle EGT's with the two different props. I may be wrong,
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but I believe you could be running leaner at full throttle with the lower RPM
prop.<<<<<
All other things being equal, the lower RPM would seem indicate a greater load on the engine by the new prop. If that is the case the engine will run richer, not leaner, with the Bing carby and the same jetting. He should be seeing lower EGT's as a result. This is one of the things that Jabiru hasn't done a very good job of explaining to folks, myself included, who buy their engines and use them on different airframes or with different props. Jabiru engines come from the factory tuned for the Jabiru airframe and a specific prop combination. If you alter that by installing their engine in a different airframe/prop combination you have to adjust the prop pitch and/or carb jetting to optimize your particular set up. A cleaner airframe, like my Europa, presents less load to the engine and will make it run leaner. In my case, much leaner. You have to adjust the jetting and prop pitch to compensate. A more draggy airframe, like a CH701, presents more load to the engine and will make it run richer. You have to adjust jetting and prop pitch accordingly. This is covered in depth in Jabiru USA's engine course. I highly recommend anyone who is operating a Jab attend it. You won't be sorry. Well worth the price charged.
Regards,
John Lawton
Whitwell, TN (TN89)
Europa N245E - Flying
Jabiru 3300 - 175 hours
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