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-   -   CHT numbers in the 14 (http://www.vansairforce.com/community/showthread.php?t=165740)

Nova RV 11-05-2018 06:09 AM

CHT numbers in the 14
 
For the guys already flying, are any of you having high CHT issues? Yesterday was about 59 degrees OAT and I never saw CHT numbers over 300, mostly mid-high 200s (all cylinders pretty consistently close). I'm not complaining but my tech helpers who both have 7s and high CHT issues thought I must have some reading errors to be that low and I don't recall anyone with a 14 posting about high CHT issues. I was flying close to WOT and full rich as these were the first flights. Can I solicit some real world CHT numbers from you guys please?

Don E 11-05-2018 03:10 PM

Just started flying
 
Chris, OAT was 64 degrees F when i flew last Thursday and i saw CHTs in the 350s on 3&4, and 370s on 1&2. Running hard to seat valves, leaned to 12gph at 78% power. Iím at six hours and consistently seeing temps in the 300s.

Bavafa 11-05-2018 03:49 PM

What temp do you guys get for the oil, if I understand it correctly, IO390 runs cooler on CHT but hotter on oil temp.

gen1313 11-05-2018 04:49 PM

Quote:

Originally Posted by Bavafa (Post 1300537)
What temp do you guys get for the oil, if I understand it correctly, IO390 runs cooler on CHT but hotter on oil temp.

I consistently get mid to high 180's in the cruise for oil. That doesn't seem to change much regardless of OAT. In the climb oil temp does get up to 210 sometimes but I try to avoid that. The worst scenario for oil temps is in the circuit on hot days. CHT's are never a problem.

n982sx 11-05-2018 05:29 PM

Quote:

Originally Posted by Bavafa (Post 1300537)
What temp do you guys get for the oil, if I understand it correctly, IO390 runs cooler on CHT but hotter on oil temp.

This is my experience, mostly 300 and below in cruise. In the summer on a hot day I can get as high as 350-375 during climb, but then they come down to below 325.

I have to watch the oil temps on climb in the summer. Not really a problem but in the summer, cruise oil temps between 200 and 210 are normal for me. As the ambient air during the winter gets colder my oil temps in cruise come down into the 180's.

Don E 11-05-2018 06:51 PM

Oil temps
 
My oil temps during the first six hours of break in have been in the 185-200 range. I have not done any sustained climbs, just 3,000 feet, then running hard. Touched 200 degrees at 78% power with 64F OAT.

KeithB 11-05-2018 07:12 PM

Similar results to others - cruise CHTs are around 300 (couple under, couple just over). At higher altitudes (OATs 30-50), all are 280-290. On high power climbs I might hit 350 - have never seen a 400 temp ever. On a cross country winter flight with -5įF OAT, CHTs fell to 200 and I had to run rich of peak to get temps up.
Oil temps run higher as mentioned - similar results with 200-210į in high power settings, but 220į is the highest Iíve seen. One nice side benefit is the engine really warms up fast after start. Unless itís winter, I never need to warm up - 100į oil after a short taxi.

Nova RV 11-06-2018 05:41 AM

Thanks guys, I will get some more data and post it tomorrow. Plesase keep sharing anyone who is currently flying. This would be important info for the next guys getting ready to fly as far as what temps seem correct for the 14

BCP Boys 11-06-2018 05:45 AM

Seat those valves
 
Chris, I would consider leaning out a bit to get things hotter on a new engine to seat those valves properly.

Jesse 11-06-2018 05:46 AM

I flew with a guy in his RV-14 in Michigan. His CHTís got over 300 in the climb, maybe as high as 350 on one or two, but in cruise at least one or two were under 300. I couldnít believe it.

In an RV-7A with a 390 that just started flying, the highest CHT Iíve seen is 394, and Cruise is around 350. Oil temp stays above 200 until the descent. Iíve seen as high as 214.


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