Feked Anti Sumping Valve advice re oil flow

Peter Waller

Peter Waller

Joined
May 16, 2021
Messages
41
Country flag
I am just about to fit the Feked Anti sumping valve with the micro switch and I also noted that the hosetails on either side of the valve are 1/3 rd smaller diameter than the oil pipes that come up from the oil pump/ timing cover. I am worried that this reduction in diameter will restrict the oil flow. I rang Feked and they said they have never heard of a problem in the thousands they claim to have sold. I have tried to get larger bore hose tails with no luck. Anyone ever had a problem?
 
The narrower the pipe the greater the frictional losses, but if the narrow section is only short compared to the full run then it will have little overall effect.
 
That was the general consensus when the topic was discussed 3 years ago.

Mine is still in the box. I put the easy to undo, AN dual sump plug on mine and just empty the sump, if I've not ridden it in the last couple of weeks. That way my oil feed is as it came from the factory, so I don't invalidate my warranty :)
 
Peter Waller said:
I am just about to fit the Feked Anti sumping valve with the micro switch and I also noted that the hosetails on either side of the valve are 1/3 rd smaller diameter than the oil pipes that come up from the oil pump/ timing cover. I am worried that this reduction in diameter will restrict the oil flow. I rang Feked and they said they have never heard of a problem in the thousands they claim to have sold. I have tried to get larger bore hose tails with no luck. Anyone ever had a problem?
Click to expand...
What oil tank - side or center?
 
Would not worry about the small reduction in diameter. Afterall, the folks running the spring ball check valves have a steel ball sitting in the middle of the oil path and yet that works fine, I know people in our local club have run them for decades (until it fails to open one day).

Also, I doubt the pump ever demands the maxium volume the hose pipe can deliver...it just needs a continuos minimum supply.
 
I put in the Feked valve about a year ago and also installed an oil pressure gauge.
It works fine on my 850
Oil pressure is fine. Like you I consulted the forum when I found out that it has a narrower internal diameter and the
advice that it will likely not make a different is correct.
No more wet sumping! I have a long string on my ignition key that I clip near the Feked and I am reminded by the clip to turn the valve on and off.

Dennis
73 850
 
DennisMo said:
I put in the Feked valve about a year ago and also installed an oil pressure gauge.
It works fine on my 850
Oil pressure is fine. Like you I consulted the forum when I found out that it has a narrower internal diameter and the
advice that it will likely not make a different is correct.
No more wet sumping! I have a long string on my ignition key that I clip near the Feked and I am reminded by the clip to turn the valve on and off.

Dennis
73 850
Click to expand...
Thank you for that reassuring reply Dennis and I am going to wire mine up to the horn so when the ignition is switched on the horn will sound until the tap is turned on for oil flow.
 
Peter Waller said:
Thank you for that reassuring reply Dennis and I am going to wire mine up to the horn so when the ignition is switched on the horn will sound until the tap is turned on for oil flow.
Click to expand...
IMHO, you need to check the current carrying capacity of the switch. If you have a stock horn, it draws more much current than the ignition system.
 
DennisMo said:
I put in the Feked valve about a year ago and also installed an oil pressure gauge.
It works fine on my 850
Oil pressure is fine. Like you I consulted the forum when I found out that it has a narrower internal diameter and the
advice that it will likely not make a different is correct.
No more wet sumping! I have a long string on my ignition key that I clip near the Feked and I am reminded by the clip to turn the valve on and off.

Dennis
73 850
Click to expand...
Huh? Why do you need an idiot string when the Feked valve has an ignition defeat switch to prevent idiocy?
 
Hi Peter,

I wired mine to cut the voltage to my Tri Spark ignition when the oil flow is turned off.

I have learned that if I crank my motor (Alton) with the ignition turned off, because I forget to
turn on the Feked, I get a back fire when I then crank with ignition on. A wopping loud backfire like a gun going off!

So if I forget to turn on ignition and crank, I can stop the backfire by cranking a few seconds with ignition still off and with throttle wide open (which clears fuel I guess), then I turn on the ignition and crank.

I suppose I could wire the Feked to cut the voltage to the alton starter relay. But I am most comfortable knowing the feked cuts the ignition

By the way, I suspect the Feked microswitch may not be able to handle the current of sounding the horn. I forget what the amperage limitation is. I suggest you wire the Feked turn on a relay to then sound the horn.

Dennis
 
Good question about why the string.

It reminds me to turn off the Feked when I turn off the ignition as string is clipped near the Feked.
Can't put key in my pocket without unclipping it.
I get a sinking Idiot! feeling when I want to start the bike on a sunny day and I have wet sumped it as I have forgotten to turn off the Feked.
Despite lapping the pump, it wet sumps in a day with the Feked left on.

Dennis
 
I have a Feked valve installed for use on my Norton 750 engine. I noticed the smaller hose barb ID, but have never had an issue with it feeding the pump. Although I have forgotten to turn it off overnight once or twice. Takes longer than a few days to fill my sump.

I also hang my key off the lever on the valve when I put the bike away.

For me it's a helpful and useful device. My 2 into 1 exhaust headers and collector run right under my sump and it was always a PITA to remove the exhaust to drain the sump before riding. If I had pea shooters and dual exhaust, I probably wouldn't use it. The sump plug with the small bolt in the center would do the trick.

My Feked valve is wired to cut ignition to a dual coil. Also wired so the switch can be bypassed if the sump switch fails. Switch failure would turn it into a manual valve which I can heartily not recommend.
 
DennisMo said:
Hi Peter,

I wired mine to cut the voltage to my Tri Spark ignition when the oil flow is turned off.

I have learned that if I crank my motor (Alton) with the ignition turned off, because I forget to
turn on the Feked, I get a back fire when I then crank with ignition on. A wopping loud backfire like a gun going off!

So if I forget to turn on ignition and crank, I can stop the backfire by cranking a few seconds with ignition still off and with throttle wide open (which clears fuel I guess), then I turn on the ignition and crank.

I suppose I could wire the Feked to cut the voltage to the alton starter relay. But I am most comfortable knowing the feked cuts the ignition

By the way, I suspect the Feked microswitch may not be able to handle the current of sounding the horn. I forget what the amperage limitation is. I suggest you wire the Feked turn on a relay to then sound the horn.

Dennis
Click to expand...
Like you I have made mine cut the power to the Trispark. Cnw starter and no banging in the pipes if I forget to turn it on,I don't think that the starter would make a difference however.I do like the security aspect as it sits behind the Z plate and is easily overlooked.
 
I also hang my key off the lever on the valve when I put the bike away.

Good idea above! I just have to remember to do it!

Dennis
 
Peter Waller said:
I am just about to fit the Feked Anti sumping valve with the micro switch and I also noted that the hosetails on either side of the valve are 1/3 rd smaller diameter than the oil pipes that come up from the oil pump/ timing cover. I am worried that this reduction in diameter will restrict the oil flow. I rang Feked and they said they have never heard of a problem in the thousands they claim to have sold. I have tried to get larger bore hose tails with no luck. Anyone ever had a problem?
Click to expand...
Peter,
I know what you are looking at as far as the barbs being a bit smaller.In some of the past discussions read what TexasSlick explained in detail. I have 2 friends that have these installed with no problems whatsoever.One suggestion that Slick gave to me was to shorten the length on the barbs a little.
Feked sells a lot of these and I think that if there was a problem there would be many people screaming by now.
Mike
 
I have the Feked valve on two Commandos. One for 15 years. Both wired to ignition power feed.
From Feked’s website,
"Internal bore diameter of tap inlet: 1/4" (6.3mm)
Suit 3/8" bore pipe, but will fit very tight into a 5/16" ID pipe"
 

Similar threads

D
Can you advise on .250 inch versus .340 inch manual internal diameter anti oil sumping valve
Replies
4
Views
526
DennisMo
D
Soundbite
  • Locked
MK3 engine oil change with an ant-wet sumping valve
2
Replies
29
Views
4,389
seattle##gs
S
F
  • Locked
Wet sumping cure - oil flow rate query
2 3
Replies
41
Views
4,992
kommando
kommando
J
  • Locked
Anti wet sumping valve, who's got one ?.
2 3 4
Replies
70
Views
6,861
laurentdom
laurentdom
Back
Top