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What size oil cooler for Borg Warner Velvet Drive?

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25-06-16, 23:13

SlowlyButSurely

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Join Date   Jul 2003   Location   Solent   Posts   491  

What size oil cooler for Borg Warner Velvet Drive?

My boat has a BMC 1.5 diesel engine with a Borg Warner 71C 2.1:1 reduction gearbox. I need to change the exhaust elbow but as luck would have it the current elbow went out of production years ago and the new elbow supplied by ASAP fouls the gearbox oil cooler which is a Bowman 12 inch oil cooler. Due to limited space the only way I can fit the new elbow is to fit a smaller oil cooler so my question is what size oil cooler will provide adequate cooling on this engine/gearbox combination? The Bowman 6 inch oil cooler would be a perfect fit but will it provide enough cooling? I ought to mention that we are currently cruising in the med.
All advice gratefully received.

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25-06-16, 23:26

coopec

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Join Date   Nov 2013   Location   Perth WA   Posts   1,702  

Re: What size oil cooler for Borg Warner Velvet Drive?

Is this any help?

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26-06-16, 07:30

bristoljim

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Join Date   Dec 2008   Posts   110  

Re: What size oil cooler for Borg Warner Velvet Drive?

As it is in the raw water circuit & with the relativly low power of your engine a 6" cooler should be fine - heat transfer is dependent on temperature difference so even in the Med before oil temperatures get critical the difference will be big so a small cooler will be very effective.
Jim

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26-06-16, 08:46

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BlowingOldBoots

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Join Date   Aug 2009   Location   Scotland.   Posts   12,971  

Re: What size oil cooler for Borg Warner Velvet Drive?

Originally Posted by bristoljim

As it is in the raw water circuit & with the relativly low power of your engine a 6" cooler should be fine - heat transfer is dependent on temperature difference so even in the Med before oil temperatures get critical the difference will be big so a small cooler will be very effective.
Jim

+1

My experience, Perkins 4236 with the same Borgwarner has a stumpy oil cooler and while I have never measured the length it is not 12" long, far shorter.

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