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Old Oct 5th 2016, 11:21 PM   #1
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fluid dynamics - hopefully an interesting question

Hi ladies and gents,

I am new to the forum. I hope I don't upset anyone with my novice question.

I am buying oil coolers for an engine. I have seen many inlet and outlet styles and I can only guess at their internal flow and restriction.I dont have the cash to have them all tested. I was hoping to get some experts to have an educated guess...

here are the pictures. I'd love to know which is the best design for least flow restriction and least pressure drop.

IMG#1


IMG#2


IMG#3


IMG#4
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Old Oct 6th 2016, 06:47 AM   #2
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You are asking only about the inlet port, but I suspect that the "best" oil cooler is the one that provides the greatest amount of cooling in terms of degrees of cooling times volume per unit time. And that depends much more on the design of the internal heat exchanger than the inlet - things like design of internal tubing, cooling fins, and materials are all very important. So you are asking which is "best" without knowing anything about the important aspects of the product. It's like asking for recommendations on automobile tires by posting pictures of valve stems.

However, you asked specifically about the inlet port, so here goes - the inlet with least flow restriction will be the one with the largest diameter. There may some secondary affects from internal threads, or obstructions (as with the third picture). But in general look for the one that has the largest unrestricted area.

Last edited by ChipB; Oct 6th 2016 at 06:50 AM.
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Old Oct 7th 2016, 01:13 PM   #3
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A highly threeaded or ribbed surface will give rise to increased frictional losses from a purely pressure loss point of view a smooth, wide orifice is best.
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