Sorry about the second message. I left one important thing out. In cruise, I run 325-350 degrees.
-----Original Message----- From: krnet-bounces+jfaughn=socket....@mylist.net [mailto:krnet-bounces+jfaughn=socket....@mylist.net] On Behalf Of Jim Faughn Sent: Wednesday, September 08, 2004 8:11 PM To: 'KRnet' Subject: RE: KR> To cool or not too kool Orma, I have a 2180 and nothing fancy such as a turbo. On an 85-90 degree day, I will take off and CHT will climb to 400-425 depending on the altitude I'm climbing too. I never exceed 450 and if it is going over 425 I will lower the nose to get more air through the engine cowl or if it is a 100 degree day, I have actually climbed a thousand or 1500 ft and leveled off to cool it and then climb again. This is especially true when I have someone else on board and I don't have the option of pulling back on power. Anyway those are about my numbers. I don't think anyone has discussed this yet but I'll bet Mark can chime in here. If you have a bigger engine and didn't create a larger exit for the hot air, you could also simply be choking off the exit air. I seem to remember, but again someone else chime in, the exit area needs to be about 4 times the intake hole size. That seems big but my books are at the airport. Cooling and timing are critical but so are the cooling hole sizes. Of course another discussion will be the larger the size the more drag but that is another item with a different fix. Jim Faughn 891JF
