flyrotary@lancaironline.net Mailing List Archive

That's the trouble with matching up isolated data points. Some of that (160 degree oil temp) is about what you need if you want to win a race and every HP is critical. Most of the time we aren't at that point. 180 deg oil is fine AND desirable. BSFC is a little better at even higher temps. Note that many modern cars run 200 - 210 deg coolant & oil temps for better fuel economy.

Cooling drag is a lot more critical for airplanes as well. Higher coolant & oil temps make lower drag cooling possible.

Even this doesn't get close to all the factors you should evaluate.

Tracy

On Mon, Dec 13, 2010 at 2:22 PM, Kelly Troyer <keltro@att.net> wrote:

----- Forwarded Message ----
From: "CozyGirrrl@aol.com" <CozyGirrrl@aol.com>
To: keltro@att.net
Sent: Mon, December 13, 2010 12:52:06 PM
Subject: Re: Fw: [FlyRotary] Re: Fw: Water temps

This is where I get confused:

said previously,

-ideal water temp = 160*~180*F

-ideal oil temp = 160*F

If we are cooling oil with water that is at best hotter than the ideal temp of the oil, then are we not adding heat to it rather than removing it?

If we are trying to cool oil, why would we feed the highest temp water to the oil/water cooler rather than the coolest temp water by tapping into the pump housing where it enters the block?

Based on feedback, the water entering the block may be as low as 150*~160*F, would this be cool enough to do an adequate job of cooling the oil?

Also, which model of Mocal is being used?

...Chrissi