Oil Pump Upgrade......
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,448
From: la la land jerzey
Prot, I know what they advertise but I have heard through the grapevine (HD Forums) that because of the way the oiling system and ports are designed on our Harley's that pressure increases are not to be expected. At the pump yes but not throughout the motor... So we'll see.....
the introduction of hyd lifters in the 1950s on to 1972 took priority oil pressure, and part time to the lower unit and the top end was secondary oil pressure
in 1973 to 1984 they made an attempt to up grade the system, but still the lower unit was not primary with oil pressure and no one has tried to make it primary
very few shovels will not smoke with 15 pounds of oil pressure at hot idle - a miracle has to happen to keep them from leaking with that much pressure and volume
but they do have over 100 pounds cold for a few minuets - reinventing an engine design 30 plus years after the last one was built might be a mistake
evos on the other hand want more as they have a car type hyd lifter and they are not primary pressure to the lower unit as well, evo switch comes on at 6 to 8 pounds
Seasoned HDF Member
Joined: Aug 2008
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From: Ohio
I run the S&S oil pump, it's gears are about 1/4" wider in depth than a stock pump. Took the Ultima pump apart also and it is identical inside compared to the S&S, the Chinese copied it to a tee.
Cruiser
Joined: Aug 2008
Posts: 190
Likes: 25
From: Rotterdam, Netherlands
Due to the high volume output, there will be more oil fling of from the big end towards the barrels. Good for cooling and lubrication, but did anyone notice an increase of oil consumption with these pumps? In other words, do the oil scrapers manage to get rid of the extra lube?
Last edited by Daedalus; Jun 3, 2018 at 10:28 AM.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,448
From: la la land jerzey
Due to the high volume output, there will be more oil fling of from the big end towards the barrels. Good for cooling and lubrication, but did anyone notice an increase of oil consumption with these pumps? In other words, do the oil scrapers manage to get rid of the extra lube?
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