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To: lml@lancaironline.net
Date: Thu, 05 Jun 2008 09:32:05 -0400
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From: Lorn H Olsen <lorn@dynacomm.us>
In-Reply-To: <list-2952667@logan.com>
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Subject: Re: CHT's-Lycoming 0-320 (LNC2)
References: <list-2952667@logan.com>

Gerard,

I climb full rich and 2,600 RPM until my EGTs come down to under =20
1,400=B0F. This normally happens at about 8,000 ft. In an O-320 you just =
=20
can't get more that 11 gph at full rich and full throttle at sea level.

My #4 temp was up to 450=B0F in the climb for about 4 months. In level =20=

flight it would go down to 380=B0F to 400=B0F. Last month, I noticed =
that =20
the aluminum plate on the left side that holds the rubber baffles had =20=

cracked. I siliconed the aluminum plate and the temperatures are back =20=

down to 410=B0F in the climb and 360=B0F to 380=B0F in cruse. All of my =20=

other cylinders are running 320=B0F to 360=B0F.

In the past, when I have had high temperatures, I have gone to the =20
plane at night and shined a flashlight up from the bottom of the =20
engine. You would be surprised at how many air leaks that you can =20
find. All of these leaks need to be sealed. You should be able to =20
lower your temps by up to 30=B0F just by sealing the baffling leaks.

I don't like the idea of cutting more cooling holes in the cowling. If =20=

you do need to get more air through, you might try putting a 1/2 to =20
3/4 inch aluminum extension on the exit side of the cowling. Angle the =20=

extension down at 45=B0. This will help pull air out.

Lorn

On Jun 4, 2008, at 6:01 AM, Lancair Mailing List wrote:

> From: gerardoconnell@optusnet.com.au
>
> Since installing an EDM 700 I notice my cylinders running around the =20=

> 380 to 415 deg C
>
> Number 1       380 deg C
> Number 2       380-398 deg C
>
> Number 3       380-395 deg C
> Number 4       415 deg C
>
> Number 4 reaches 430-450 in the climb out at 130 KIAS
>
> I am thinking of putting 2 NACA ducts in the top cowl to address =20
> particularly NO 3 & 4 temps
>
> What say ya'll
>
> Gerard

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,400 hrs, N31161, Y47, SE Michigan