Date: Sat, 29 Jul 2000 00:05:09 GMT From: "William Brooks" <sea.brooksnopsamdnet.att.net> Subject: Re: How hot is too hot?
Good guess on the slope of the grade... but a 9000T with an automatic weighs around 3200 pounds. So, factoring that in to your equation (of which I'm pretty impressed) it was more like 100 horse power. Still, I would think that sufficient cooling capacity to handle the engine's rated horsepower (160) would be a given. I was using high octane fuel because I knew I had some hills to climb and I didn't want the APC to have to retard the ignition to avoid pinging. I have heard that retarding the ignition will cause the engine to run even warmer. "Andrew Stephenson" <amesnopsamrak.demon.co.uk> wrote in message news:964826929snznopsamrak.demon.co.uk... Cannot help with a yes/no, or even absolution for your misdeeds. But let's do some sums. Not knowing how heavy your car was that day, or what the average gradient was, I'll have to work in terms of 1,000 Kg mass (1.102 short tons) and slope of 1:6. At 70 mph, the power you were asking the engine to deliver, just to lift the car up that hill, was approximately (1000*9.81)*(70*0.447*(1/6)) = 51159.15 watts which is 51159.15 / 745.7 = 68.6 horsepower (roughly) Adjust the figures to suit reality. I'd say you were working it pretty hard, especially when you allow for AC, power loss in the transmission and at the tyre/road interface and, at that speed, maybe also air resistance and momentum lost to bugs smacking the bodywork <g>. Some (over)heating should be too surprising. -- Andrew Stephenson
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