BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auction JRC Engineering dealers JWood Auction
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
jetpoweredmonkey
jetpoweredmonkey
Sacramento, CA
Posts: 31
Joined: September 2006
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
205 registered members (1xfatboy), 1,826 guests, and 554 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Gus1956, Henry74, Benny, Lou Quirch, Mark Masa
10045 Registered Users
Top Posters(30 Days)
Lannis 152
kommando 112
Stuart 58
Popular Topics(Views)
480,882 mail-order LSR
Forum Statistics
Forums33
Topics65,768
Posts635,817
Members10,045
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Anti sump valve #217622
10/08/08 3:49 am
10/08/08 3:49 am
Joined: Oct 2008
Posts: 7
McAlester,Ok.
L
lwc Offline OP
BritBike Forum member
lwc  Offline OP
BritBike Forum member
L
Joined: Oct 2008
Posts: 7
McAlester,Ok.
Hi guys I need advice on the best anti sump vavle out there for my 74 commando.Any ideas Lowell

Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
Re: Anti sump valve [Re: lwc] #217648
10/08/08 11:41 am
10/08/08 11:41 am
Joined: Aug 2007
Posts: 221
Port St. John, FL USA
J
Jim Clausen Offline
BritBike Forum member
Jim Clausen  Offline
BritBike Forum member
J
Joined: Aug 2007
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.

Re: Anti sump valve [Re: Jim Clausen] #217671
10/08/08 2:29 pm
10/08/08 2:29 pm
Joined: Aug 2001
Posts: 333
Texas Gulf Coast
Curmudgeon Offline
BritBike Forum member
Curmudgeon  Offline
BritBike Forum member
Joined: Aug 2001
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
Re: Anti sump valve [Re: Curmudgeon] #217788
10/08/08 10:36 pm
10/08/08 10:36 pm
Joined: Jul 2006
Posts: 872
newcastle australia
trevinoz Online content
BritBike Forum member
trevinoz  Online Content
BritBike Forum member
Joined: Jul 2006
Posts: 872
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.

Re: Anti sump valve [Re: trevinoz] #217809
10/09/08 12:56 am
10/09/08 12:56 am
Joined: Nov 2006
Posts: 326
Boston -
Mike667-neighbor of the beast Offline
BritBike Forum member
Mike667-neighbor of the beast  Offline
BritBike Forum member
Joined: Nov 2006
Posts: 326
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
Re: Anti sump valve [Re: Mike667-neighbor of the beast] #217812
10/09/08 1:04 am
10/09/08 1:04 am
Joined: Oct 2008
Posts: 7
McAlester,Ok.
L
lwc Offline OP
BritBike Forum member
lwc  Offline OP
BritBike Forum member
L
Joined: Oct 2008
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

Re: Anti sump valve [Re: lwc] #217819
10/09/08 1:34 am
10/09/08 1:34 am
Joined: Aug 2007
Posts: 221
Port St. John, FL USA
J
Jim Clausen Offline
BritBike Forum member
Jim Clausen  Offline
BritBike Forum member
J
Joined: Aug 2007
Posts: 221
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.
Re: Anti sump valve [Re: Jim Clausen] #217846
10/09/08 4:13 am
10/09/08 4:13 am
Joined: Jul 2006
Posts: 872
newcastle australia
trevinoz Online content
BritBike Forum member
trevinoz  Online Content
BritBike Forum member
Joined: Jul 2006
Posts: 872
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.

Re: Anti sump valve [Re: trevinoz] #217950
10/09/08 8:25 pm
10/09/08 8:25 pm
Joined: Jul 2003
Posts: 301
Connecticut
maylar Offline
BritBike Forum member
maylar  Offline
BritBike Forum member
Joined: Jul 2003
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
Re: Anti sump valve [Re: maylar] #217987
10/10/08 12:15 am
10/10/08 12:15 am
Joined: Aug 2007
Posts: 221
Port St. John, FL USA
J
Jim Clausen Offline
BritBike Forum member
Jim Clausen  Offline
BritBike Forum member
J
Joined: Aug 2007
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.
Re: Anti sump valve [Re: Jim Clausen] #217995
10/10/08 1:05 am
10/10/08 1:05 am
Joined: Dec 2006
Posts: 208
Glenwood, Iowa USA
TBolt72 Offline
BritBike Forum member
TBolt72  Offline
BritBike Forum member
Joined: Dec 2006
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 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.1.1