16H Wet sumping - Velocette oil valve

Hi,I have used a very neat and good working valve I bought from Bri-Tie Motorcycles and after about 10 years use I have had no problems. I have used this type on single and twin Norton`s.

Svein.

Mick Hemmings anti-drain valve is based on the Velocette design. I've use one on my Mk 3 Commando for the past few years without problem.

I have thought of a relatively simple method of installing an anti drain valve on the PRESSURE side of the Norton Twin timing case. Should a few people show interest I will draw it up. The manufacture of it should be fairly simple. As you would appreciate, having a valve on the pressurised feed side is vastly safer than a valve fitted to the inlet side of the oil supply.

Les

Les, have you considered the leak inside the pump, the oil moves from the feedside through the shafts to the scavange side and then out of the oil pick up into the sump. I have fitted two X ring seals to a pump for that fix, they seal the end faces of the 2 feed gears so oil cannot get to the shafts. Just stopping the flow out of the feedside into the crank is only half the solution. For the 2nd 1/2 I finally have some nitrile 1/4" balls on route, I have deepened the feed hole so it can have the spring and ball installed to shut off the flow once the engine has stopped.

The prewar bikes had the oil pressure tell tale on the RHS of he crank case - so you should know immediately if any tap has been turned on. Of course I'm not in the habit of looking for it though!

For a while I did use a ball valve with a switch to disable ignition.It looks like a washing machine cut-off with a push switch operated by turning the lever. It needs to be'push to make' the power wire forcoil ignition and 'push to break the earth cut-out' for K2F magneto - but that's not so easy for a single with a mag. Can it be done, I wonder?

That's not there for various reasons so now I just start up and tick over very gently, smoking a lot, until the oil is returned.