Gearing an oil pump
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Gearing an oil pump
Hello guys.
So I'm here to ask the experts!!!! My 48 pan 84" strocker fitted with a 51-67 oil pump all rebuild I have 30 miles on the bike after rebuild. Ones it gets warm the oil pressure goes down and the light comes on, oil is still returning but not squirting just slowly running to the tank. So there is flow. Can I gear the pump so it runs faster??? Any pointers on this will be appreciated!!!
Sorry for the English I'm from Denmark:-)
So I'm here to ask the experts!!!! My 48 pan 84" strocker fitted with a 51-67 oil pump all rebuild I have 30 miles on the bike after rebuild. Ones it gets warm the oil pressure goes down and the light comes on, oil is still returning but not squirting just slowly running to the tank. So there is flow. Can I gear the pump so it runs faster??? Any pointers on this will be appreciated!!!
Sorry for the English I'm from Denmark:-)
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Re: Gearing an oil pump
Unclered,
Welcome to the site!
Is it a stock oil pump? Low oil pressure on panheads is very common.
Welcome to the site!
Is it a stock oil pump? Low oil pressure on panheads is very common.
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Re: Gearing an oil pump
Welcome UncleRed!
Much too common is that modern sending units need too much pressure.
OEM were something like 4 psi to open, and break the connection to the dash light.
Is your's an ACCEL?
....Cotten
Much too common is that modern sending units need too much pressure.
OEM were something like 4 psi to open, and break the connection to the dash light.
Is your's an ACCEL?
....Cotten
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Re: Gearing an oil pump
Hi guys thanks for fast replys!!!
Yes it is an original oil pump!! (51-67)
Been thru 3 repop sending unit no accel yet I'm still looking for an old original one!!!!
But the oil is returning but how do I know if it's enough??
Unclered
Yes it is an original oil pump!! (51-67)
Been thru 3 repop sending unit no accel yet I'm still looking for an old original one!!!!
But the oil is returning but how do I know if it's enough??
Unclered
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Re: Gearing an oil pump
UncleRed!
Is there disturbing noise or heat?
Finding quality sending units is a chase.
....Cotten
Is there disturbing noise or heat?
Finding quality sending units is a chase.
....Cotten
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Re: Gearing an oil pump
Cotten.
No disturbing things at all, just the horror in my head constantly saying what if!!!
But the oiltank gets warm as the motor so it must oiling ok???
Unclered
No disturbing things at all, just the horror in my head constantly saying what if!!!
But the oiltank gets warm as the motor so it must oiling ok???
Unclered
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Re: Gearing an oil pump
UNCLERED!---The stock pump should be plenty of press. for your motor!.--As Cotton stated new sending units are junk!---I put a new 1 in mine & changed back to the 1 thats been in there for 15yrs.--The light would come on as soon as I came to a stop!---The old one comes on after about 2min. at a light & a little throttle & it goes out!---When you buy them its a shot at what press. its going to set off the light!-(PITA). As long as you have oil returning to the tank,-no worries!--Pans are known for actually to much oiling up-top!--& if you install a guage -(it will drive you nuts!). As long as you are not overheating -your good to go!--At operating temps. 10 to 15lbs. is plenty!-When you first fire-up it may read 30+lbs.--I have been running a stock pump for 24yrs. & never a oiling problem!.---A friend of mine has a guage on his pan-shovel & at oper.-temps. hes got 5lbs!---NO OILING PROBLEMS! ,Been that way for 6yrs. now.----RICHIE
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Re: Gearing an oil pump
Hi again and thanks
I Will come down and see if i Can find an original sending Unit
I Will come down and see if i Can find an original sending Unit
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Re: Gearing an oil pump
[quote="unclered"]Hi again and thanks
I Will come down and see if i Can find an original sending Unit
quote]
First off, I'll unnecessarily echo everyone else by saying "yeah, it's scary, but it's fine." Mine's been pushing no more than 3-4 psi when hot for many years and many thousands of miles without problems. That said, unless you're very rich, or very lucky, you may have trouble finding a good stock unit. I've been on the hunt for over 4 years now with no luck. The other day one was posted on eBay, but once again when it went up to over $170, I lost interest...
-Kuda
'49 panchop
I Will come down and see if i Can find an original sending Unit
quote]
First off, I'll unnecessarily echo everyone else by saying "yeah, it's scary, but it's fine." Mine's been pushing no more than 3-4 psi when hot for many years and many thousands of miles without problems. That said, unless you're very rich, or very lucky, you may have trouble finding a good stock unit. I've been on the hunt for over 4 years now with no luck. The other day one was posted on eBay, but once again when it went up to over $170, I lost interest...
-Kuda
'49 panchop
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Re: Gearing an oil pump
I know:-( and unfortunately I'm not very rich.
3-4 psi is that when the motor is idling???
Unclered
3-4 psi is that when the motor is idling???
Unclered
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Re: Gearing an oil pump
Yep. When it's really hot, and the oil is getting near the end of it's life (I change mine every 2000 miles), it'll actually get down to 2 psi or so at idle, and when I had a gauge on it (which didn't last long), I saw it go to zero (which was probably really only 2-3 psi) when I was rolling down the highway at 70 mph. The oil light will come on at anything less than 20 mph or so. But if I pull the oil cap and shine a flash light in there, oil is still drooling out of the pipe, so it's circulating, and that's all that matters if you have solid lifters/pushrods.unclered wrote:I know:-( and unfortunately I'm not very rich.
3-4 psi is that when the motor is idling???
Unclered
-Kuda
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Re: Gearing an oil pump
Kuda!
You were lucky to find a gauge that would read that low.
Please remember that at highway speeds, the motor itself becomes the pump.
As oil is thrown from the rod bearings, it literally draws oil in behind it, causing a reduction of pressure of sorts.
It is not the pressure of oil that lubes, it is its presence.
....Cotten
PS: I have never experienced hydraulics starving at high speeds.
You were lucky to find a gauge that would read that low.
Please remember that at highway speeds, the motor itself becomes the pump.
As oil is thrown from the rod bearings, it literally draws oil in behind it, causing a reduction of pressure of sorts.
It is not the pressure of oil that lubes, it is its presence.
....Cotten
PS: I have never experienced hydraulics starving at high speeds.
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Re: Gearing an oil pump
Does your pump have the early type adjustable pressure regulator...or is it the fixed type? If its the early type , the adjustment is 3/8 in from the casting end.
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Re: Gearing an oil pump
It's the fixed type!! But thanks:-)
Anyway, do any of you know if you can gear up or down the oil pump??
Anyway, do any of you know if you can gear up or down the oil pump??
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Re: Gearing an oil pump
IM taking a shot in the dark on this!--I have rebuilt OEM pumps back to original!--As far as gearing it up---(spinning faster)--It would take a diff set of gears obviously, & the size would be diff.-(if im wrong someone will correct me!)--If the gears are of diff. diameter it would take extensive machine work & ruin a otherwise good pump!---It would be ALOT cheaper to get a aftermarket hi-volume pump. I never geared-up a stock-pump!---But hell they might have some aftermarket gears that fit a OEM pump without to much MODS. GUYS HELP HERE I would like to know who makes faster spinning gear sets for a quicker flow myself!---As a matter of fact I may have read something on this in some dope at the shop awhile back!--(long-while)-so its probable & been going on for awhile!--I just never had to do it & DONT WANT to give you the WRONG INFO!---RICHIE--With respect!--GOOD-LUCK--The boys will straighten it out!