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 -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Orma Sent: Wednesday, September 08, 2004 7:09 PM To: KRnet Subject: KR> To cool or not too kool Hello Net I now feel that I am writing the episodes in the continuing saga of Orma's KR. By 9 this AM I had added the fuel pump and this regulator type device( It seems that restricts the flow of fuel, as opposed to controlling pressure). I ran the engine and for the first time I knew that I was running rich at WOT. In fact so rich that the engine tried to quit. I found that when the pump is on, I did not get an anticipated flood of fuel. The engine seemed normal till I reached the part where I had carved a step in the needle. At that point, the engine flooded. After several trial settings, I installed the last needle that I got from Joe at Revmaster. To get the best run, I would start with the fuel off and after a warm up I would push the throttle to WOT and turn on the pump. But, the real question is what about the temp. I made a 3 minute run at WOT, controlling the flooding by moving the mixture control. I was able to hold the temp of #3 to 450. The engine was turning 30 00 and 30 MP. This is the first time that I was able to see the effects of the fuel cooling the cylinder. This is still not too Kool. I need to cool the thing down at least another 50 degrees. I can live with 400 CHT on takeoff. All the time that I have had the CHT gauge in the cockpit, and I don't remember what the takeoff numbers were on the old engine. What are some of the takeoff numbers that other get? Orma Southfield, MI N110LR celebrating 20 years To the gathering or bust _______________________________________ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
