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Old 05-22-2016, 08:33 PM
Mark C. Mark C. is offline
Join Date: Nov 2009
Location: Schaumburg
Posts: 119
Angry Running Too HOT

RV9A, IO360. Catto Tri-prop. I am now 16 hours into my phase 1 flight on normal cruse seeing 385F CHT at 3,000' cyl. #1 the hottest running, OAT is 76F. On climbs at that altitude 500 FPM they can all push over 400F. what actions have some of you guys performed to bring these temps. down?? Thanks, Mark C. 119RV
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Old 05-22-2016, 08:44 PM
YellowJacket RV9 YellowJacket RV9 is offline
Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,314

Do you have the standard Van's baffle kit with the air dam in front of cyl #1? If so, try cutting it down or removing it. Inlet air ramps installed? I had to remove and re-glass my inlet ramp forward on the right side. This provided more area above #1 and brought temps down about 10 degrees. Absolutely sure your baffles are sealed everywhere?

Also, is it a new engine? If so it will probably cool down a good bit as it breaks in. And lastly, do you have wheel pants and fairings installed? I just installed my main gear fairings and saw a gain of 5-7 knots and temps down another 8-10 degrees.

I am at a similar point in Phase 1 as you. My goal is under 400 all the time - right now #1 creeps over 400 in a climb (it's also 90 degrees OAT...). I'm getting close, and think that adding wheel pants and front gear fairing will do the trick.

Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16

Last edited by YellowJacket RV9 : 05-22-2016 at 08:48 PM.
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Old 05-22-2016, 09:36 PM
Mark C. Mark C. is offline
Join Date: Nov 2009
Location: Schaumburg
Posts: 119

thanks, Chris... New Engine, stock Vans baffles very well sealed. No wheel pants yet on any of the wheels. I have cut down the forward air dams about 1/2 inch. It make sense as others have stated just take them out.. Mark C.
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Old 05-22-2016, 10:22 PM
RV7AJeremy's Avatar
RV7AJeremy RV7AJeremy is offline
Join Date: Aug 2010
Location: Gilbert AZ
Posts: 416

Get the wheel pants on. I saw 10-15 degree drop in CHT's once installed. I have an IO-360 with hartzel CS prop. Your numbers don't seem too far off from what I saw during initial break-in without wheel pants. I also removed my air dams too.
Carbon Cub EX2 N852AZ KCHD
EAA Tech Counselor
2017 Bronze Lindy
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Old 05-23-2016, 08:18 AM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,358

Your numbers are very close to mine, though #4 is my hottest. I am just finishing up the wheel pants now and we'll see what that does. I ended up cutting my lower cowl exit area about 1" forward of the firewall during the first part of Phase 1, that helped quite a bit. I may end up putting it back in and installing the Anti-Splat louvers for climb cooling, we'll see.
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 750 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 05-23-2016, 02:53 PM
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RV10inOz RV10inOz is offline
Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,303

What RPM do you get on take off and early climb out, what speed are you climbing at and what is the fuel flow and MP just after take off?

You would not be the first person to have an FCU that does not flow anywhere near enough fuel.

David Brown

DYNON Authorised Dealer and Installer

The two best investments you can make, by any financial test, an EMS and APS!
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