RPM goes back and fwd 200 RPM while cruising

by Julio Consuegra in General Tech Discussion 10 years ago

While cruising, the power goes back and fwd about 200 rpms, it is real, not only indication. Who has had the same problem in a 912 100 hp ?
What could be: carburator or CDIs ?

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Re: RPM goes back and fwd 200 RPM while cruising

by Kevin Machniak » 10 years ago

Kevin Machniak

6 167 40

I dont have that problem ,but first thing to come to mind is an intermittent fuel restriction. Do you have a fuel pressure gauge?

Is it a constant in rythm pulse? Is it affected by slight pitch control up or down?

Any work done prior to problem?

I think you need to supply as much details as you can .

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Re: RPM goes back and fwd 200 RPM while cruising

by gaetan belanger » 10 years ago

gaetan belanger

0 10 0

Buenos noches Julio, I agree with Kevin , give us a bit more details .....is it only at cruse or at idle also ? have you inspected your engine compartment after your last flight for leaks or vacuum leak

Phil

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Re: RPM goes back and fwd 200 RPM while cruising

by Julio Consuegra » 10 years ago

Julio Consuegra

5 7 0

I did the 500 hors service and changed the cowling. It happens in cruise at 5.300 rpm

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Re: RPM goes back and fwd 200 RPM while cruising

by Julio Consuegra » 10 years ago

Julio Consuegra

5 7 0

I do not have the fuel pressure gauge, it happens at 5.300 rpm in level flight. I did the 500 hours service and changed the cowling

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Re: RPM goes back and fwd 200 RPM while cruising

by gaetan belanger » 10 years ago

gaetan belanger

0 10 0

Hola Julio take a magnefying glass and have a look at your intake manifold.....around the bolt and right in the middle...also check you intake gasket...may I ask why you did change your cowling ???
buena suerte

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RPM goes back and fwd 200 RPM while cruising

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