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Old 01-06-2018, 06:07 PM
jacksel jacksel is offline
Join Date: Jul 2005
Posts: 108
Default High CHT

I recently began flight testing my RV-7. Since my engine is new (superior XP-360) I have tried to be diligent about adhering to break-in procedure. However, from the start I have noticed that cylinders 1 and 2 (forward two) run 30 to 40 degrees warmer (CHT) than 3 and 4. I now have 13 tach hours on the engine. Is it accepted protocol in a case like mine to simply trim some off the air dams at the front?

Thank you

John Walsh
RV-7 builder
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Old 01-06-2018, 06:13 PM
Dbro172's Avatar
Dbro172 Dbro172 is offline
Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,040

Yes. I ended up removing mine completely. Then in the winter I add some foil tape as needed, to balance the cylinders.
Derek Hoeschen
EAA Tech Counselor
RV-9A #92103 - N803DK
G3X, Superior XO-320, Dual Pmags, Catto 3B

RV-8 #83565 - N184DK - building
1968 Mooney M20C - Sold
1956 C-182 - Sold
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Old 01-06-2018, 06:22 PM
jabarr jabarr is offline
Join Date: Sep 2008
Location: Fayetteville, Georgia
Posts: 188

You should start with no front air dams then add as required to balance temps.
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