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03-23-2009 | 03:49 AM

#22

DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: Engine tuning question

Quote:

ORIGINAL: pauser98

...change to a small 12x8 prop, engine raced to 11,000 RPM.
Change back to 12x6 prop - engine reached 8,500 RPM at full throttle after some adjusting to the high end!
(Peak RPM in the manual for this prop is 8,800)

This running at 11,000 RPM - did it un-stick something inside the engine or the carburettor....?

Chris,

It seems something did clear an obstruction that was 'at large'.

It is, however, much safer to locate the problem by diagnosis, then to hope it becomes rectified on its own...

However, the situation you are seeing; with a lower load prop (12x6) being spun much more slowly than the higher load prop (12x8 - 11K is 1.38 HP; a respectable number), is more than a hint that some kind of a problem still exists...

Rectify it before you try flying!

EDIT: Typographical...

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