Higher than normal CHT1, IO360 A3B6D

[PTK]

Last few flights I noticed a higher than normal CHT1. I've set the EDM to alarm at 390 and it has alarmed. I'd open the cowl flaps to the trailing setting and the CHT dropped. I'd close them again and it crept up again. The oil T was normal all along.

After landing the other day I checked my cowl flaps in closed and noticed that they are closed fully vs the 1/4 inch or so trail setting in cruise which I thought they were in. Until I started to notice this CHT increase. I adjusted them to trail slightly open again and voila, all good!

Moral of the story: check and correct the simple things first. 

Of course the real question now is how did they lose their trail slightly open setting they've been on all along?!

[Alan Fox]

1 hour ago, PTK said:

Last few flights I noticed a higher than normal CHT1. I've set the EDM to alarm at 390 and it has alarmed. I'd open the cowl flaps to the trailing setting and the CHT dropped. I'd close them again and it crept up again. The oil T was normal all along.

After landing the other day I checked my cowl flaps in closed and noticed that they are closed fully vs the 1/4 inch or so trail setting in cruise which I thought they were in. Until I started to notice this CHT increase. I adjusted them to trail slightly open again and voila, all good!

Moral of the story: check and correct the simple things first. 

Of course the real question now is how did they lose their trail slightly open setting they've been on all along?!

Probably adjusted at the annual