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Old 12-28-2020, 12:18 PM
rwarre rwarre is offline
Join Date: Jul 2007
Location: Wray, Co
Posts: 601
Default Bump out

Was having trouble with high CHT on #3 cylinder with my newly rebuilt engine, so decided to try making a bump out on the firewall side of the baffle. i got the pictures from another builder so thanks for that. The bump out worked, cylinder CHT dropped and all is good so far.
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Old 12-28-2020, 03:48 PM
plehrke's Avatar
plehrke plehrke is offline
Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,740

What does it look like? I can’t visualize it from your description. Can you post the pictures?
How much higher temperature did your cylinder 3 have? Are there a different “bump outs” sizes for different temperature adjustments needed?
RV-6A - flying 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
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Old 12-28-2020, 04:54 PM
gmkonrad gmkonrad is offline
Join Date: Feb 2005
Location: Howell,MI
Posts: 140
Default Bump out

I believe this is the bump out for #3 cylinder that RWARRE is referring to.
I put one on my -7 when making the baffles. NO hot #3 CHT. It works.
Photo credit to BillL.

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Old 12-28-2020, 05:03 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,705

Maybe this??
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 12-28-2020, 05:36 PM
rwarre rwarre is offline
Join Date: Jul 2007
Location: Wray, Co
Posts: 601
Default Picture

The pic that gary put on is what I followed. I was able to drop the temp by about 25 degrees
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