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Oil cooler inlet/outlet orientation

Phang

Phang

Cruisin' Guzzisti
GT Contributor
Joined
Jun 16, 2009
Messages
388
Location
Singapore
This has been bothering me for a while.

The Griso/Stelvio/Breva oil cooler has the feed and return line at the bottom.

BREVA%201200033.jpg


Unless there is a check valve in the circuit and the cooler is factory air bled, I reckoned air will be trapped in the upper rows of the oil cooler during normal operation causing a reduced cooling efficiency.

I spoke to several peoples, some thought I am no smarter than the Guzzi engineers, some said the oil pump will flush/push the air down and some said a check valve will hold the oil in the oil cooler and keep it fill up after engine shut down.

ducati-sport-classic-radiator.jpg


IMHO, the top feed/return orientation works better as it would hold the oil in the cooler after the engine shut down even without the presence of a check valve and allows any trapped air to be flushed out from the outlet located at the top row of the cooler.


What’s your view?

Phang
 
It's a moot point unless you know what the pressure and return line orientation is in the block, If the return line just dumps into the sump then I don't see a problem with an air lock in the cooler.
 
Phang,

I was interested in your question .... and it started bothering me! :lol:
I remember taking some courses in college (way back) in fluid dynamics but I'm no expert.
Just a thought.
I found some information concerning natural fluid flow in an engineering site that may be of some interest.

The different flows of fluid.
http://www.engineersedge.com/fluid_flow/forced_natural_circulation.htm

Conditions required for Natural Liquid Flow
http://www.engineersedge.com/fluid_flow/conditions_required_natural_circulation.htm
In general .... areas with different temperature exist in the oil cooler "Heat rises" as long as the fluid is in contact.

This would explain even a bottom feed would remove the air pocket at shut down (Engine hot)
 
Thanks for the links Dan but that's too heavy for my grey matter to digest at this hour (12:20 midnight). I'll read it later in the morning.

Phang
 
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