C90 Engine running cool

[Colin Dix]

Hello,

Our C90 is running qround 40 deg C cooler since we performed a top end overall. Can anyone expain this. Also we had the Mags overhauled too?

Thanks

Colin

[David Hardaker]

Colin
What sort of temps are you getting, assuming you're cruising at a steady 2350 (say) ?
From my what my own C90 ran at, I'd be expecting an oil temp of 70 to 80C.
One thing's for sure, I don't see any harm in cruising at higher rpm's, as everything gets nicely warm. Creeping around at low rpm's is not good... ! Having said that, I can think of a C90 in a Jodel that refused to go much above 60C oil temp, whatever the OAT was.
Regards
David

[Colin Dix]

Dave,

I'm not sure of the oil temperture, the cylinder hear reaches around 110C, before it used to get to 140C? Very confusing!

[David Hardaker]

Colin
Yes, confusing.
Maybe the sender/thermocouple is playing silly B's if it's been disturbed.
My C90 had no CHT, or even oil pressure gauge, just an oil light. Very low tech, so I can't relate to your figures.
But 1400 hours later it was still going strong !
It wouldn't be the first time a sender had caused much head-scratching, and even expense. I have a particular dislike of oil pressure gauges which rely on a sender. Far better to have "live" oil pressure on the panel....What you see is what it is, not what some gismo thinks it is.
I know what Fred would say !
regards
David

[pillpoppinpilot]

Hi Colin

In my C90 in a Jodel D117, the oil temp has never been above 60 deg C in a climb in summer! It normally only just registers just above 40 after some time in flight. I thought I had a faulty temp sender as it's probably very old.
I've just had the engine top end overhauled and the mags so I'll see if there's any difference.

Tony Smith

[Colin Dix]

Thanks Tony,

I have now left the Emeraude group but will pass on any comments to them,

Thanks

Colin