POH or Continental Operator’s Manual?

[hubcap]

I was reviewing the Continental Operator’s Manual for Myrtle’s engine (TSIO-360-LB) and found that in some instances the POH makes recommendations contrary to Continental’s recommendations. 
 

For instance - My POH recommends running up at 2000 RPM for checking mags while Continental recommends 1700 RPM. 

There are other differences, such as starting procedures etc.

So… which to follow?

[EricJ]

22 minutes ago, hubcap said:

I was reviewing the Continental Operator’s Manual for Myrtle’s engine (TSIO-360-LB) and found that in some instances the POH makes recommendations contrary to Continental’s recommendations. 
 

For instance - My POH recommends running up at 2000 RPM for checking mags while Continental recommends 1700 RPM. 

There are other differences, such as starting procedures etc.

So… which to follow?

The aircraft POH always supercedes the component (e.g., engine) manual, since the aircraft manual includes installation considerations, which can't be accounted for in the component manual.

[A64Pilot]

POH, it may for instance say 2000 RPM due to a prop restriction or similar. But POH takes precedence, it probably says that in the Conti documents.

Having said that in my opinion it needs to sometimes be taken with a grain of salt as they may have different agenda’s. POH often stresses performance over longevity whereas the engine manual may be recommending limits based on longevity

Edited July 29, 2023 by A64Pilot

[GeeBee]

Yes on the IO-550 Continental says, 300 degrees CHT minimum for takeoff, Mooney says 250. 

[hubcap]

40 minutes ago, GeeBee said:

Yes on the IO-550 Continental says, 300 degrees CHT minimum for takeoff, Mooney says 250. 

So does Mooney have knowledge about the engine that Continental doesn’t?

[PT20J]

20 minutes ago, hubcap said:

So does Mooney have knowledge about the engine that Continental doesn’t?

Not the engine per se, but Mooney has knowledge Continental does not have on the engine as installed in the airplane. The airplane manufacturer is the final authority regarding the airplane. That said, the only section of the POH/AFM that is regulatory and approved by the FAA is the Limitations section and that is clearly indicated in the document. So, you are free to conduct your mag check at any rpm you desire.

[kortopates]

How would Continental know how their engine performs in a Mooney airframe with a prop selected by Mooney?


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[EricJ]

1 hour ago, hubcap said:

So does Mooney have knowledge about the engine that Continental doesn’t?

Yes, Mooney knows the test and certification results for how the cowling and baffling affect cooling and oil temperature, and how the air box and filter and exhaust system affect power production, etc.    Those affects are all unique to the airframe and the engine manufacture has no way to know what those will be.