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HIGH CHT NORMAL EGT & OIL TEMP

by Michael Nault in 912 / 914 Technical Questions 5 years ago

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Re: HIGH CHT NORMAL EGT & OIL TEMP

by Michael Nault » 5 years ago

Michael Nault

9 19 0

This engine has 368 hours and the high CHT just began late last summer. It has no thermostat, no oil/coolant exchanger, system flushed (water only - no additives). I have repeatedly tried to eliminate air pockets by running it up to operating temperatures then shutting it down and removing heat exchanger & radiator caps, opening radiator bleed ports (screws) and tying the tail down (it's a trike) for several minutes.
It idles and cruises smoothly and develops 5500rpm at WOT. If I had a vacuum leak on #3 bank, wouldn't my EGT increase as well due to the lean condition? Also, do you recommend a coolant system flush additive and does back flushing the system pose any problems?
Thanks - Mike

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Re: HIGH CHT NORMAL EGT & OIL TEMP

by Steve Cogger » 5 years ago

Steve Cogger

1 2 0

Hi Mike,

Did you fix it?

I also have a trike and have just had the engine out for a rebuild. I noticed now that CHT is far higher than it used to be....even 10 mins at 2000rpm on the ground is giving me a steady 100c....or 115c @ 3600rpm. I'm suspecting an airlock, but never had airlock probs in the past.!

Thanks
Steve

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