Mailing List flyrotary@lancaironline.net Message #53262
From: <Lehanover@aol.com>
Subject: Oil coolers
Date: Mon, 13 Dec 2010 19:23:28 EST
To: <flyrotary@lancaironline.net>
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
The ideal is that the coolest water would pass through the water to oil cooler first.
 
The ideal oil temperature is below 160 degrees. If the water temperature of your installation and just about everybody else's is 180 or 190 then cooling the oil with only water will not yield the ideal oil temperature.
 
But it will yield oil temperatures very close to the water temperature. If for some reason your oil temps are out of control, like 190 or 200 degrees, then the water to oil cooler will improve the situation, at the price of increased water temps.
 
I had no room for a larger water radiator, and when I went to water to oil cooling, my water temps were too high, and the oil temps about 10 degrees higher than the water. So I scrapped the cooler and used it for a transmission cooler in an air to oil mode.
 
I added 2 more Setrab 40 row coolers in the oil loop and got oil temps under 180.
 
Mazda is about the only car that comes with an oil cooler. Even the sedans and pick up trucks. So it is important. I think it was in 85 that RX-7s came with a water to oil cooler mounted under the filter adaptor.
 
It did not last out the model year, and was never seen again. Back to the air to oil cooler under the radiator.
 
In the big picture there is only air cooling.
 
One advantage of a water, or coolant filled cabin heater is that it adds core volume. So, should a overheating problem crop up, you can turn on the heater blower on full blast and get a few more miles out of the engine, or even save the engine.
 
Lynn E. Hanover
 
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