Author Topic: Anti Wet Sumping Valve  (Read 2366 times)

Offline alanp

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Anti Wet Sumping Valve
« on: 13.10. 2011 17:07 »
Just thought I'd post up a photo of the valve I've fitted on the line from the oil tank to the engine.
It's a manual valve since I didn't want to risk an auto valve. I know some of you use autos, but I couldn't bring myself to fit one.
I run with 20W 50 oil so the oil gets through to the crank when not in use somewhat quicker than your average 40 or 50 grade.
I always have to switch off my ignition isolator switch before starting and will now include a check that the valve is open.
Hope this helps someone.

PS Just looked at the photo and realised that I need to give the bike a good clean after its 3000 miles or so.
Member of the 'Last of the Summer Wine Club - Jennycliff'.

Online Triton Thrasher

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Re: Anti Wet Sumping Valve
« Reply #1 on: 13.10. 2011 18:00 »
My mate put one on his late 1940s Norton International.

Guess what happened.

Offline MG

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Re: Anti Wet Sumping Valve
« Reply #2 on: 13.10. 2011 18:13 »
I found this neat contraption on the internet recently:

When the valve is closed, the magneto cut-out contact is earthed via the push button. The bracket could be mounted using one of the hose adaptors that screws into the valve housing?
1955 A7 Shooting Star
1956 A10 Golden Flash
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Online Triton Thrasher

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Re: Anti Wet Sumping Valve
« Reply #3 on: 13.10. 2011 18:30 »
In industry, we assume switches like that won't work when you need them.


Think I've said it before on here. Make the lever of the tap long enough to interfere with the kickstart, when closed and you might get off with it.


Online bsa-bill

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Re: Anti Wet Sumping Valve
« Reply #4 on: 13.10. 2011 18:43 »
It comes down to whether you have more faith in a non return valve or your memory, much as it hurts pridewise to say so I know my memory comes a poor second. *whistle*
The switch is a good idea but the more failsafe bits you incorporate the more bits there are to fail - catch 22 *doh*
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline nigeldtr

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Re: Anti Wet Sumping Valve
« Reply #5 on: 19.10. 2011 21:39 »
I found a new SRM oil pump solved the problem, also improved the oil pressure. Never liked death valves, I have had one blown engine through oil starvation - what a bloody mess and expense.
1951 Golden Flash (engine now rebuilt) 1953 M21 a pain to start and 1961 GF that is turning into a black hole!

Offline lawnmowerman

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Re: Anti Wet Sumping Valve
« Reply #6 on: 19.10. 2011 21:59 »
Just bought a valve with kill switch combined from A W Dove for £40 inc UK postage. Used extensively on AMC machines which are notorious for wet sumping.
I am going to get in the habit of killing the engine with the oil switch rather than the handlebar switch - that way I know the switch works after every run.
I need to find a good supplier of oil line with the armoured spring round the outside. Any ideas?

The PO used straight 40 - now I know why! When I changed to 20/50 it filled the sump in a few weeks.

Jim
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1938 Wolseley 14/60
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1960 BMW R60
1954 Matchless G80S
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1951 Sunbeam S7DL
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Online muskrat

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Re: Anti Wet Sumping Valve
« Reply #7 on: 20.10. 2011 06:58 »
Good work Alan, now all you need is a new clutch cable. One strand gone!
Cheers
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Offline Goldy

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Re: Anti Wet Sumping Valve
« Reply #8 on: 20.10. 2011 08:20 »
I agree with nigeldtr a new SRM oil pump solves the problem, and as these bikes require great care and attention a new oil pump not only solves the problem but as said, gives that all important oil delivery to the engine. Fitting anti sump valves is just a problem waiting to happen and as bill says you cannot rely on you memory. Ok so a new pump is £225 but that is a very small percentage of the motorcycles value and will give year of trouble free service.
All the best Goldy
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