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CHT on climb

Mlasalle

By Mlasalle
in Modern Mooney Discussion

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Mlasalle Apprentice

Mlasalle

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I live in south Louisiana where it's pretty warm. Been paying more attention to CHT on climb trying to keep it below 380. The POH rec climb at 125 knots is too slow to keep it down. Even 135 -145 seems to creep up the temps over 390. This is the number 5 head that's right behind the alternator. Today the surface temp was 78 degrees and at 5000" oat was 65. Fuel flow is 26-27 gph. WOT at 2650.

Any ideas? Fuel flow to low. RPM settings?

BTY she's an Ovation 3

Mlasalle Apprentice

Mlasalle

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Haven't taken cowling off since last oil change 20 hrs ago. They were fine then. I'm not having any significant change in CHTs, just paying more attention to them. The #5 head stays 20 degrees hotter on climb then comes down when level. The others say well below 380. But that makes sense, there is a baffle at the inlet I can see. I'll check it out tomorrow. Thanks

Marauder Grand Master

Marauder

Posted
Posted

This is bird nesting season as well for some of us. Might be worthwhile take a look under the cowling. If you didn't have a problem beforehand, maybe it is something simple.

Marauder Grand Master

Marauder

Posted
Posted

Also, RPM max out at 2650. Should she get the whole 2700 pr is that normal?

I would have the accuracy of the tach checked before jumping on the prop governor. Mine maxes at 2690 using the digital tach.

29-0363 Collaborator

29-0363

Posted
Posted

I've posted the MFD engine page of 29-0363 in cruise at 8,000 ft.  Note #5 CHT is higher than the others - always has been, as well as having the lowest EGT.  On leaning #4 will always peak first, then almost simultaneously #2 will peak.  Leaning was around 100F ROP, hence the high FF.

post-7031-0-87204300-1366616602_thumb.jp

Mlasalle Apprentice

Mlasalle

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I've posted the MFD engine page of 29-0363 in cruise at 8,000 ft.  Note #5 CHT is higher than the others - always has been, as well as having the lowest EGT.  On leaning #4 will always peak first, then almost simultaneously #2 will peak.  Leaning was around 100F ROP, hence the high FF.

What are u getting on CHT on climb?

PMcClure Mentor

PMcClure

Posted
Posted

My Ovation 2 is getting the same results. #5 is always the hottest and reaches 390-410 on climb out. I checked the baffles and everything looks good. Others are around 350-360. 

Mlasalle Apprentice

Mlasalle

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Gotcha. I just read other posts on those holes. My #5 is running in 390s only on climb. Once level it gets down below 360. I was just a bit concerned for damage on the climbs, but if that is normal, I can live with that. But, I'm low time enough to not have gone through a rebuild on a big engine like the 550.

fantom Grand Master

fantom

Posted
Posted

Its a hole that sometimes develops without explanation or logbook entry. It just appears like pixie dust.

miss_pixie1_web.jpg

 

Does great work with never a notation ;)

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