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  #1  
Old 9th July 2018
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Default Oil cooler simple routing suggestion (see drawing)

I have a 4 speed with a 5 speed oil pump.

Due to different design the return line from the oil filter pad is not directly in to the pump but under the engine.

I have a little oil cooler ( a small metal tube with fins) with an IN and a OUT inlets.

where it's best to place it? Between A and B (feed line) or
between C and D (return) ?

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Old 11th July 2018
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I would think either would be fine as long as its not restricting oil flow.
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Old 12th July 2018
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Default

No restriction. It's basically a metal tube "U" shaped with fins.
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Old 12th July 2018
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Default

Return line has higher pressure/flow - I'd put it there.
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Old 13th July 2018
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Do not agree. The return line has no restriction except from the bung on the tank. The scavenge pump also does not have to overcome the clearances in the oiling system. The pressure pump has to supply oil under pressure through those restrictions. The return line will carry oil heated by the engine operation though. So the oil temp in that line will be the hottest.
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Old 13th July 2018
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So this can be good?
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Old 13th July 2018
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On my ironhead I have the cooler on the tank return line.
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Old 13th July 2018
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Same on mine. Feed line from pump to cooler, other side of cooler to tank return.
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Old 1st August 2018
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I have to admit that when at home after about 30 km in 40 mins in a 100°F day, the metal tubes of the cooler are cool. The first part of the hoses attached to it are cool too. The oil tank is hot . The oil temp is the same (195°F). But It's the hottest day I used the bike in this summer ..I never saw 100°F before in this summer.

Last edited by conv90; 1st August 2018 at 16:03..
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Old 6th September 2018
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I just bought a oil cooler.
The guy who did it to me fixes bikes.
He said put it on the oil return line to the tank
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