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CHT Overheating issue
We installed the Dynon HDX in our RV7A over 2 years ago. We also redid all of the engine baffling. The CHT on #4 always ran hot on takeoff. We replaced a number of components and traced it to a wire. The probe itself was ok.
Now, on take off 2,3 and 4 all show hot at 410 to 425 on #4. Any thoughts? It was suggested I install cowling Louvers to provide more air flow. The carburetor was overhauled last year and I installed a new fuel pump. It came out of annual this past spring. Thanks....... Steven Superior 0-360 with fix pitch |
CHT
I just went through it myself. I can share what my issues were.
History: O320 and installed a Dynon system. New probes, wires. Conditioned in May 19. No issues found. Issue: High CHT (405-425) Solution: 1) Timed both mags. They were advanced a few degrees. Ok, maybe a lot of degrees. Lol. It was a certified new engine w 250 TTSN. 2) Dynamically balanced the prop. It was .034”. It’s now .006” The timing dropped my CHT so much that I can now climb at Max gross at 1,900 ft/min through 5,000. Then 1,200 ft/min through 9,500 and stay below 400. Cruise is now 360s. And my fuel flow went from 7.5 to 6.7 gph at 65% / 142kt. Not sure if it helps, but if you haven’t checked timing in the last 50 hours, I’d start there. Good luck with your search. |
Check your magneto timing.
If you have P-mags, PM me your number and I'll walk you through it. If you have even a small leak in your baffles, it can make a surprisingly large difference in CHT's. Louvers are a last ditch effort and should be avoided. |
CHT
I forgot a third change that helped a lot
3) Cut the bottom cowl back at a 45 degree |
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Other temps and info required
What are your other CHTs, oil temp, are you running
rich, at or lean of peak, carb or injection, what injection, ignition? Engine model? Thx. |
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