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Chrissi wrote:
"If the oil were being
cooled with water only and we wanted the best possible chance at that,
wouldn't we want to feed it the cooler water from the high pressure side
of the pump prior to entering the block?"
Yes, that would give you the best chance at cooling the oil but it misses the opportunity to get the increased cooling efficiency of boosting the rad inlet temperature with the 230 degree oil coming out of the pump. In other words, you will need a bigger rad if you use the cold side of the coolant for the oil cooling. How much bigger is the answer I'd like to know, but I don't.
Tracy
On Mon, Dec 13, 2010 at 5:22 PM, Kelly Troyer <keltro@att.net> wrote:
Sent: Mon, December 13, 2010 4:05:31 PM
Subject: Re: Fw: [FlyRotary] Re: Fw: Water temps
Thanks Tracy for the adjustment in my thinking. I don't want to target temps unrealistically.
Where does that leave us with our pick up and return points for the oil/water cooling system? If the oil were being cooled with water only and we wanted the best possible chance at that, wouldn't we want to feed it the cooler water from the high pressure side of the pump prior to entering the block?
Whatever space we would use for an oil/air cooler takes away from potential coolant radiator space. Putting the two side by side becomes less efficient spacewise for both due to losses for structure etc. If it is not possible to cool the oil adequately with water alone then we'll need to back up a little and make other layout plans. I remember Richter's Cozy III with three P-51 scoops, it got the job done but was like dragging a parachute in drag.
Kelly, to your comment below, while I am sure we'd have no problem putting adequate heat into the oil, I am very concerned about keeping any more than just enough out of it. Much easier going one way then the other =)
...Chrissi
In a message dated 12/13/2010 2:49:02 P.M. Central Standard Time, keltro@att.net writes:
Chrissi,
My own opinion is that after warm up and in flight the oil temp leaving the engine before the
coolers (air or water to oil) will almost always be well above 160-180 F..............If it is not this
high then the oil to water cooler will actually help warm it to a more efficient temp.........IMHO
Somebody correct me if this is a fallacy !!.......................<:)
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
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
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