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Subject: Re: My airplane is running HOT
From: Lorn H Olsen <lorn@dynacomm.us>
In-Reply-To: <list-4396322@logan.com>
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References: <list-4396322@logan.com>

Bryan,

The vernatherm is a distinct possibility. If it is a vernatherm problem, =
it may just be that the vernatherm  is not seating correctly. Lycoming =
has a tool that you could obtain and use to smooth the vernatherm seat.

When I started flying my plane after the last engine teardown, the CHTs =
went up to 480 in the climb and the EGTs would not go over 1,300. =
Normally in the climb my CHTs go up to 440 and the EGTs are up to 1,500. =
After all of the other checks, I had the timing looked at. The left mag =
was set at 50=B0 BTDC instead of 25=B0 BTDC. Correction of the left mag =
timing fixed the problem.

Now I know that high CHTs and low EGTs can mean advanced timing. Visa =
versa, low CHTs and high EGTs can mean retarded timing.

Lorn

> Date: July 16, 2010 11:21:15 PM EDT
> Posted for Bryan Wullner <vonjet@gmail.com>:
>=20
>  Anybody have any ideas or advice for the following situation:
> =20
>  Lancair 360 with carbed 360 (180hp) engine. 475 hours on it about. =
Chrome
>  Cylinders. I have a Plenum cooling system and larger cowling inlets.
>  (Zavatson's cowling and plenum system)
>  Oil cooler is mounted at the front inlet.
>  Oil wont cool in climb and will go up to 230 and probably higher if =
not
>  stabilized. CHT's are all hot in climbs and will go to 440 no =
problem. Cant
>  figure it out.
>  Motor runs great, compression good, boroscoped fine, mag timing good. =
All
>  leaks in plenum or baffling are sealed.
>  Probes were checked out ok.
> =20
>  Only thing I haven't checked is the vernotherm.
> =20
>  Thanks for any advice.
>  Bryan
--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,700 hrs, N31161, Y47, SE Michigan