Would larger oil hose size increase cooling?

by Mike Tiffee in General Tech Discussion 4 hours ago

The 915/916 oil tanks have AN10 fittings on the tank outlet and the engine oil pump inlet also has AN10 fittings. The returns out of the engine as well as the tank inlets are AN8. The only specification in the installation manual regarding hose size is showing a minimum of .39" (10mm).

With that, should I be using 5/8" hose from the tank, through the oil cooler, and into the engine? I'm currently using 1/2" hose everywhere. Would upsizing that hose increasing cooling? And if so, why does the manual only specifiy .39" hose. Even the "Rotax" hose shown in SI-PAC-013R2 is only 12mm (just under 1/2").

So why the larger fittings on the tank and oil pump?

Thanks,

Mike

Re: Would larger oil hose size increase cooling?

by James Ott » one hour ago

James Ott

22 338 407

I don't know how a larger oil hose would give better cooling. All it would do is lower the oil pressure somewhat which would not affect cooling. Oil flow rate would not increase because the pump has a fixed displacement and puts out the same flow independent of pressure. As long as the normally used 1/2" hoses keep oil pressure within acceptable limits, which they do, the only thing larger hoses would do is add weight. I would guess that the larger (#10) fittings which are on the oil pump suction side help reduce the pump inlet vacuum to avoid cavitation.

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Would larger oil hose size increase cooling?

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