Hi Hannes and others. I have the same bottom cowl as Ian and have modified it according to his results but have not yet seen his photo's. I did it as per discussions with him and I think I understood. I am still playing with variables in relation to a kick down profile at the rear of the cowl. It has made a noticeable difference but best results have come from this and using rich mixture on climb and I mean rich. I find in our Dimona about 20mm of travel delivers the right result at full power climb. I have been battling CHT issues for some time and the combination seems to work well. A few weeks ago I launched in 35C and got a comfortable 160C in an extended climb. Treat it like a power plane when it comes to leaning mixture. Same principle when you don't have a EGT. Richen it until it starts to lose power and run a bit wooly then back it leaner till it is smooth and with normal power. That is as rich as you can get practically really and I find I get good temps in climb. Once in cruise or cool down I go back to the normal mixture as the carb is adjusted to and the temps are fine. Cheers. Nige.
----- Original Message ----- From: Maree, Hannes To: [email protected] Sent: Monday, December 06, 2010 9:25 PM Subject: [DOG mailing list] RE: Reducing CHT Hi Doglist, A while ago there was a discussion regarding changing the air outlet of the Dimona to reduce engine temperatures. I have recently overhauled the engine of my Dimona and want to ensure I do not overheat. I constantly find myself on take off with CHT's running to 400 degrees C and really have to reduce throttle to get anywhere near a max of 370. Can changes be done to the outlet to increase the airflow through the engine? Any ideas will be highly appreciated. I must add that we are currently flying in ground temperature conditions of 32 - 35 dgrees C. Best Regards Hannes Maree ------------------------------------------------------------------------------ From: Ian Mc Phee [mailto:[email protected]] Sent: 06 December 2010 12:42 PM To: DOG LIST Subject: [DOG mailing list] Fwd: [jabiruengines] ethanol in fuel from Jabiru engines group. Perhaps we will just remove the enthol in the future Ian M ---------- Forwarded message ---------- From: randy beachler <[email protected]> Date: 6 December 2010 20:56 Subject: [jabiruengines] ethanol in fuel To: [email protected] Not sure where I saw this, but on the sta-bil website, they are coming out with a fuel treatment for ethanol early next year.....not sure if will help with fiberglass tanks....rb --- On Sun, 12/5/10, John Miller <[email protected]> wrote: From: John Miller <[email protected]> Subject: Re: [jabiruengines] liquid cooled heads To: [email protected] Date: Sunday, December 5, 2010, 11:15 PM Lynn: I wonder of MMO would protect fiberglas tanks from ethanol by coating the tank? John M ___ This email and all contents are subject to the following disclaimer: www.lonmin.com/emaildisclaimer
