M20J Engine Baffling / What option is best?

[carusoam]

Summarish…

1) FF up in the 18-20 for keeping CHTs lower in the climb…. IO550s use 28-30 for the same reason…

2) Seals are everything… get them worked out, cleaned, keep them from folding back on themselves…

3) Check seals at the front… alternator and starter often leak air pressure into where it doesn’t belong…

4) Follow-up on that sawtooth pattern CHT…. If that were EGT it has a meaning of a sticking valve…  find out what is causing that.

5) Guy Ginsby is the guru of air cooling seals… have a conversation with him.

6) always be aware of temp issues… prove they are real, or instrument related.

7) all knobs forward is typical Mooney climb profile…

8) leaning in the climb is possible as the MP drops…

9) EGTs are hard to compare between planes because they are very dependent on MMs distance from the exhaust valve… 

10) Many Mooney EGT sensors were not put in exact standard locations in the IO360… standardized locations probably didn’t arrive until the late 80s… when installed at the factory…

11) cruise climb speed 120 indicated is a good method of keeping CHTs under control while moving across the ground and getting to altitude…

12) cowl flaps open…?   (Old worn ones have a tendency to close on their own)

 

PP summary only, not a mechanic…

Best regards,

-a-

 

[MikeOH]

1 hour ago, M20Doc said:

Generally fuel flow should be 9-10% of rated horsepower 18-20GPH, but that’s only as accurate as our K factor calibration on your fuel flow instrument.

@M20Doc

Thanks!

I'm pretty sure I have a problem with FF, then.  On a typical fill up of 45 gallons, I'm within 1-2 gallons; a few percent error.  However, if I'm suppose to have 18 and I'm seeing 16...that's nearly a 13% error!  More if it should be 19-20 gph!

Is this adjustable, or does the RSA5 need to be sent in?

[MikeOH]

Just now, M20Doc said:

RSA injectors, unlike Continental fuel injectors are not field adjustable with regards to increasing maximum power fuel flow.  Idle speed and mixture are the limits.

@M20Doc

Is this an injector problem?  I was thinking the low fuel flow is due to a setting within the RSA body/servo.  Am I incorrect?

[MikeOH]

33 minutes ago, Evan said:

When was the last time the servo was OH'd?

Good question! I need to check the logs. I believe the OH interval is 12 years.