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Old 06-09-2011 | 11:21 AM
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I've been asked this question three times this month. Eddie (as usual) is right. Since there were some differing opinions I thought I would mediate.

Oil "in" goes in the thermostat side, out obviously on the opposite end. The thermostat only fits in one spot, oil comes in from the top.
The sea water direction in the cooler is unimportant from the user's perspective.

Russ Cromer
2489607850

Last edited by Mr. Cool; 06-09-2011 at 11:25 AM.
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Old 06-09-2011 | 11:27 AM
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Originally Posted by Mr. Cool
I've been asked this question three times this month. Eddie (as usual) is right. Since there were some differing opinions I thought I would mediate.

Oil "in" goes in the thermostat side, out obviously on the opposite end. The thermostat only fits in one spot, oil comes in from the top.
The sea water direction in the cooler is unimportant from the user's perspective.

Russ Cromer
2489607850
Oil tstats have one in and 2 outs. 1 hot out and one cold out. If you plumbed it to go into the non tstat side of the cooler the tstat would have two ins and one out which of course would not function properly.
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Old 06-17-2011 | 01:16 PM
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Originally Posted by Lee
I guess I should of made it clearer as in engine oil out side to the T-stat.

As far as Parallel vs Counter Flow of the oil to H2O, Counter Flow is ALWAYS more efficient as seen here:http://www.engineersedge.com/heat_ex...nger_types.htm
What you have experienced with the oil temp not making a difference means that the t-stat was doing it's job but it was doing it at a different percentage of the of the t-stat, with Parallel H20 flow the stat may have been opened at 80% to maintain the temp, with Counter Flow H2O it would approximately be opened at 60% to maintain temp thus making the cooler more efficient and able to handle a higher load and still maintain temp. The Parallel flow would reach it's max cooling capacity before the Counter Flow.

Counter-flow also has 3 other advantages over the parallel flow design, more uniform temperature difference between the two fluids which minimizes the thermal stresses throughout the exchanger, the outlet temperature of the cold fluid can approach the highest temperature of the hot fluid (the inlet temperature). and the more uniform temperature difference produces a more uniform rate of heat transfer throughout the heat exchanger.
Lee, I agree 100% with the theory of what you have posted. However, has anyone seen quantifiable results switching from parallel flow to counter flow? I would like to hear from someone running an oil temp gauge with no oil T-stat who has seen a temp reduction by switching from parallel to counter flow. Not disputing what you said out of hand, just looking for someone who has seen it making an actual difference on a boat.

Thanks.
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