Xbr500 oil circuit

[Propellor]

Anyone put their hands on a cutaway drawing of the above? I've seen one on here before but can I heckers like find it.

Wouldn't mind swotting up on this subject a bit. Seems to crop up a lot!

Cheers, and may your engine runneth over with oil. 

[themoudie]

Does this link help? 

Adventure_Rider_Forum_XL600/Domi_oil_pump_etc

Start at page 1, enjoy the images and carefully read. There appear to be specific age related problems with the oil pumps and also retro fitting new pumps to older crankcases, be careful!

This may also be relevant to the cavitation discussion that is ongoing in another thread.

My regards, Bill

[Propellor]

Does this link help? 

Adventure_Rider_Forum_XL600/Domi_oil_pump_etc

Start at page 1, enjoy the images and carefully read. There appear to be specific age related problems with the oil pumps and also retro fitting new pumps to older crankcases, be careful!

This may also be relevant to the cavitation discussion that is ongoing in another thread.

My regards, Bill

Cheers bill.

Only read the first post so far, but if that is anything to go by then there is a design flaw with the pump. Cross leakage from one pump to the other. Under certain circumstances. I'll read the rest of it later. Can't see the oil circuit drawing on there, so if anyone can put their hands on it. Cheers.

Edit: read it all now. The first post is the crux. Some pictures have disappeared. Going by langer, it seems the pump body is maybe not rigid enough and suffers cross leakage when hot.

[SteveC#222]

There is a similar article on one of the American XR600 sites - basically it sounds like if you start tuning and/or racing the standard pump can cause problems. I would imagine there is probably an uprated pump somewhere as the Americans like their Desert racing and the big Honda singles are popular - maybe White Bros?

I've never heard of it being a particular problem on the standard XBR used in a 'normal' way though some of the sidecar boys have fitted oil coolers so it may be the pump is on the upper edge of it's comfort zone.

[Propellor]

There is a similar article on one of the American XR600 sites - basically it sounds like if you start tuning and/or racing the standard pump can cause problems. I would imagine there is probably an uprated pump somewhere as the Americans like their Desert racing and the big Honda singles are popular - maybe White Bros?

I've never heard of it being a particular problem on the standard XBR used in a 'normal' way though some of the sidecar boys have fitted oil coolers so it may be the pump is on the upper edge of it's comfort zone.

Cheers Steve.

Maybe the easiest solution, if you're using max power for extended periods or have a high state of tune, is to keep the oil at manageable temperature?

Maybe an oil pressure switch tapped into the pressure at cylinder head level might be a good idea? At least that would be an indication that you're in trouble! Pull over. Have a cuppa. If you're racing, sod it, the trophy is more important. 

[JOOLZ]

Interesting article, I wonder if running straight grade 40 oil will minimise this problem

[themoudie]

Aye Joolz,
Sounds like a Duke single to me! 
My regards, Bill

[Propellor]

Interesting article, I wonder if running straight grade 40 oil will minimise this problem

What temperature is the oil getting to? Maybe then speak to some oil company's for viscosity ratings at that temperature?

Re cooling. Fabricate a special tank with fins inside? Run the supply and return pipes in copper or aluminium. Fatigue breaks will be an issue then! Has anyone tried returning via a radiator? Make the tank a higher capacity? Maximise suction head. This may help stop the cross leakage as well as cavitation
 
Just thinking out loud. 

[guest564]

Maybe the easiest solution, if you're using max power for extended periods or have a high state of tune, is to keep the oil at manageable temperature?

I ran an oil cooler on my Tigcraft though I never measure the oil temperature I always had heat soak issues when waiting to go out. XL/XR600 oil coolers were a relatively common fitment.

There was a thread on here a while back that stated that a later pump could be used that had a higher capacity.

[guest564]

Maybe the easiest solution, if you're using max power for extended periods or have a high state of tune, is to keep the oil at manageable temperature?

I ran an oil cooler on my Tigcraft though I never measure the oil temperature I always had heat soak issues when waiting to go out. XL/XR600 oil coolers were a relatively common fitment.

There was a thread on here a while back that stated that a later pump could be used that had a higher capacity.