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Subject: Re: Need advice on improving cooling
From: Lorn H Olsen <lorn@dynacomm.us>
In-Reply-To: <list-4832426@logan.com>
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References: <list-4832426@logan.com>

Bryon,

I don't understand. I am cooled the same way that you are but it takes =
15 minutes of taxying to get my oil temp up to 70=B0F. My gage does work =
because if I close my cooling air door (behind #3) the temp will go into =
the 200s in flight.

I am thinking that the cooler is really bad or the vernatherm has to be =
checked.

As far as head temps, I have no comment because you haven't mentions the =
explicate temperatures.

Lorn

> From: Bryan Wullner <vonjet@gmail.com>
> Date: January 29, 2011 11:36:33 PM EST
>=20
> My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to =
cool and I am feeding the oil cooler with air off the #3 cyl.
>=20
> My chts are high on the ground and takeoff. The oil temp is high on =
the ground as well. Its to the point where I can't takeoff if I'm on the =
ground too long. And the hotter days aren't even here yet.
>=20
> Also my carb temp climbs on the ground and pegs at the gauge limit of =
127 degrees. I've replaced the probe and the manufacturer seems to think =
its operating normally. This would make me believe my lower cowling area =
is getting hot and not enough air flowing out of it.
>=20
> My AP has checked my engine, compression, timing etc and doesn't =
believe there is any issues with it. The cooler is a 9 vane SW that was =
new when installed.
>=20
> My plan was to add cowling louvers to the lower cowling on each side =
below the cyl banks.  I would hope this would improve the air movement =
out the cowling.=20
> I read that cht probes could read high if they run close to the =
exhaust in a tight cowling. Mine do. Also the carb probe is kind of =
close to the exhaust as well. Not sure if this is my case. All my =
baffles are in place and properly sealed.
>=20
> Anybody have any advice on where to place these or other ideas that =
would improve cooling or things to check
>=20
> 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, 1,750 hrs, N31161, Y47, SE Michigan