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#217622 - 10/08/08 3:49 am Anti sump valve  
Joined: Oct 2008
Posts: 7
lwc Offline
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lwc  Offline
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McAlester,Ok.
Hi guys I need advice on the best anti sump vavle out there for my 74 commando.Any ideas Lowell

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#217648 - 10/08/08 11:41 am Re: Anti sump valve [Re: lwc]  
Joined: Aug 2007
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Jim Clausen Offline
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Jim Clausen  Offline
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Posts: 221
Port St. John, FL USA
Do not use any of the in-line check valves. Putting anything between the oil tank and the oil pump is asking for trouble. Send your timing cover and oil pump to Alternative Motorcycle Repair and they will put a check ball in the pump output and modify the pump to prevent wet sumping. I know I will get some flak on this. Some will say they use one of the spring loaded in-line check valves with no problem. They are cheap, quick and dirty. I had one. When the oil is hot oil pressure drops to zero at idle. Ended up wiping the lobe off the cam.

#217671 - 10/08/08 2:29 pm Re: Anti sump valve [Re: Jim Clausen]  
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Curmudgeon Offline
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Curmudgeon  Offline
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Posts: 333
Texas Gulf Coast
This topic is about as contraversial as it gets so be ready. Having said that, I would try Al Miles Classic Brake in La Selva Beach, CA. ph# 831-684-1202
Al makes a check valve that he claims has a built in safety feature where if the valve ever does fail it will do so in the open position so that it won't cut off oil to the engine. I've been using a check valve on my '74 Commando for over 10 years with no problem but I also installed an oil pressure guage for extra safety. My hot oil pressure at idle is around 20 psi.


reliccycles.com
#217788 - 10/08/08 10:36 pm Re: Anti sump valve [Re: Curmudgeon]  
Joined: Jul 2006
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trevinoz Online content
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trevinoz  Online Content
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newcastle australia
I have just seen the results of having an anti - sumping valve in the oil feed line.
Rebore, new pistons, crank grind, cam grind and bearings and gaskets plus labour.
Easier and less expensive to drain the sump.
Trev.

#217809 - 10/09/08 12:56 am Re: Anti sump valve [Re: trevinoz]  
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Posts: 326
Mike667-neighbor of the beast Offline
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Mike667-neighbor of the beast  Offline
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Boston -
Originally Posted By: trevinoz
I have just seen the results of having an anti - sumping valve in the oil feed line.
Rebore, new pistons, crank grind, cam grind and bearings and gaskets plus labour.
Easier and less expensive to drain the sump.
Trev.


major
bummer..
what type of inline valve did you have


73 850 Commando
75 Ducati 750gt
78 Laverda 1200
97 Ducati 900 SS
61 BSA A10
62 Triumph T110
#217812 - 10/09/08 1:04 am Re: Anti sump valve [Re: Mike667-neighbor of the beast]  
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lwc Offline
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lwc  Offline
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Posts: 7
McAlester,Ok.
Jim ,Thanks for the advice .I think I will do the AMR thing.It appears to be the safest.Thanks for all of the responses.Iam new to this and it is GREAT.Lowell Cable

#217819 - 10/09/08 1:34 am Re: Anti sump valve [Re: lwc]  
Joined: Aug 2007
Posts: 221
Jim Clausen Offline
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Jim Clausen  Offline
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Port St. John, FL USA
Originally Posted By: lwc
.I think I will do the AMR thing.It appears to be the safest.


It's also the cheapest. Refer to Trevinoz's post.

Last edited by Jim Clausen; 10/09/08 12:31 pm.
#217846 - 10/09/08 4:13 am Re: Anti sump valve [Re: Jim Clausen]  
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trevinoz Online content
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trevinoz  Online Content
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newcastle australia
It wasn't my bike thankfully. I have no idea what sort of valve it was. It is in the bin.
I have been riding Nortons and BSAs for many years now and wet sumping is just a way of life.

#217950 - 10/09/08 8:25 pm Re: Anti sump valve [Re: trevinoz]  
Joined: Jul 2003
Posts: 301
maylar Offline
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maylar  Offline
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Posts: 301
Connecticut
My 850 has wet sumped since new. I don't drain anything or check valve anything and it's been fine for 34 years. I just fire it up and let it idle for 2 minutes before checking the oil level, per the instructions in the rider's manual.


Dave from CT
#217987 - 10/10/08 12:15 am Re: Anti sump valve [Re: maylar]  
Joined: Aug 2007
Posts: 221
Jim Clausen Offline
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Jim Clausen  Offline
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Posts: 221
Port St. John, FL USA
I pretty much agree, Dave. The most serious thing with wet sumping is the crankcase being so full it pushes out the drive side crank seal. Not bad when you compare that to some of the damages done by check valves.

If you think about it, the Commando oil pump is designed to be gravity fed. An inline check valve creates a blockage that the pump has to overcome by suction. I don't think this is a problem at 2,000 or greater RPM. The Norton oil pump is designed to provide approximately 10 PSI for every 1,000 RPM. My Combat, with a new oil pump and fresh bearings exceeds that. When I installed the check valve, I got zero oil pressure at idle when the oil was hot. I even tried taking a few turns off the spring in the check valve. Still no oil pressure at idle. The oil pressure take-off is the front rocker arm spindle, left side. I chucked that check valve under the bench.

Last edited by Jim Clausen; 10/10/08 12:17 am.
#217995 - 10/10/08 1:05 am Re: Anti sump valve [Re: Jim Clausen]  
Joined: Dec 2006
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TBolt72 Offline
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TBolt72  Offline
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Posts: 208
Glenwood, Iowa USA
Thats all great information for us new to the Norton Commandos. I was getting ready to order one for the basket case I just bought, but I think I'll just put up with the wet sumping.


Moderated by  Dave Comeau 


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