Oil cooler. Up or down.

[Pegleg]

What's the pro's and con's to fitting the oil cooler with the inlet/outlet top or bottom? 

[imago]

Connections at the side or the bottom mainly because if they're at the top you can't drain the oil out of the cooler when you're doing a service. It's also possible to get air trapped with some types of cooler due to the connectors protruding into the cooler and the way the feed/return hoses need to loop to connect. Routing the pipes neatly is much more difficult too.

Cooling wise they'll work either way.

[wraith]

+1 with above 

I like the pipe work out the bottom, less pipe work. 

Think it's all down to personal choice 

[TLRS]

Will the cooler fill up completely when the connections are on the bottom?

[Joseph]

When doing a oil change with filter, it still leaves at least 1 liter of old oil in the engine, so emptying the 200ml from the cooler won't change much eitherway

[imago]

19 minutes ago, Joseph said:

When doing a oil change with filter, it still leaves at least 1 liter of old oil in the engine, so emptying the 200ml from the cooler won't change much eitherway

 Not really sure what to say to that, other than it's nonsense.

[Joseph]

dunno, thats what the manuals say, give or take, depending on which engine is being serviced ?

Edited May 20, 2023 by Joseph

[imago]

2 hours ago, Joseph said:

dunno, thats what the manuals say, give or take, depending on which engine is being serviced ?

I wonder if they're on about an oil change without filter? Even then there's nowhere in an engine that'd hold a litre (getting on for 2 pints) of oil. A few ml in the galleries, similar amount in the cam chest, a bit in crank drillings and the like, it just wouldn't add up to a litre. Maybe they're just being cautious with capacities in case people go by the amount rather than the level?

 

[Joseph]

well tbh when changing oil i've never pre-measured the oil in a jug to match what the manual says, i've just added it to match the window level notch in the clutch cover. i know there's enough in a 5L tub to cover the oil change need, i just buy one and fill up.

but for example, the manual says, in terms of capacities, for a 750R : 

engine overhaul : 5.0L

oil change only : 3.6L

oil and filter change : 3.8L

thats 1.2L left inside, according to Suzuki-san ?

granted that must include the cooler capacity, approx 200-300ml ?

and then if you take the sump off, and then take the oil pump strainer off, i would say at least half a pint will dump out, i guess cause you're breaking some vacuum seal releasing this amount from the pump area ?

@george 1100said that he runs the engine for 5-10 sec once emptied of oil when he does his oil changes to make sure he gets it mostly all out.

[imago]

I think fill to the level is how most people fill the oil, I certainly do. I just don't see a litre or more in the system, that half pint in the strainer and sump is about a quarter of a litre, so on the 750r figure you have there it still leaves almost a litre to go. 

[TonyGee]

22 minutes ago, Joseph said:

@george 1100said that he runs the engine for 5-10 sec once emptied of oil when he does his oil changes to make sure he gets it mostly all out

That gives me the heebie-jeebies  

[Dezza]

My oil cooled bike has a 19 row main cooler (top fittings) and a smaller head cooler (in seat) and together they retain almost exactly 1 litre of oil when the oil is drained through the sump. To get it all out requires cooler removal.