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Gerard,
I climb full rich and 2,600 RPM until my EGTs come down to under 1,400°F. This normally happens at about 8,000 ft. In an O-320 you just can't get more that 11 gph at full rich and full throttle at sea level.
My #4 temp was up to 450°F in the climb for about 4 months. In level flight it would go down to 380°F to 400°F. Last month, I noticed that the aluminum plate on the left side that holds the rubber baffles had cracked. I siliconed the aluminum plate and the temperatures are back down to 410°F in the climb and 360°F to 380°F in cruse. All of my other cylinders are running 320°F to 360°F.
In the past, when I have had high temperatures, I have gone to the plane at night and shined a flashlight up from the bottom of the engine. You would be surprised at how many air leaks that you can find. All of these leaks need to be sealed. You should be able to lower your temps by up to 30°F just by sealing the baffling leaks.
I don't like the idea of cutting more cooling holes in the cowling. If you do need to get more air through, you might try putting a 1/2 to 3/4 inch aluminum extension on the exit side of the cowling. Angle the extension down at 45°. 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 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 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
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