HPOP oil?
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Senior User
Joined: Feb 2007
Posts: 351
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From: Duluth
HPOP oil?
I would have thought that the engine oil was what lubricated the HPOP? can someone give me the easy skinny on what is up with the oil on the HPOP. Do the HPOP's come from ford oiled do they lose oil over time" i installed a new one 2 years ago, never put oil in it and haven't had issues yet......
Postmaster
Joined: Jul 2006
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From: Indianapolis
The HPOP is just a gear driven rotary pump that is lubricated by the same oil it pumps. Basically its a set of I thing 5 small pistons that are cam actuated by the rise and fall of a ramp, which basically pushes each piston up and down sucking in LP oil and focing it out under pressure. Just imagine a WWII rotary engine with piston standing up vice outward. The early 99's have a 15* ramp, while the 99.5 and up had a 17* ramp, more pressure, better fuel atomization...
Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
To answer your question, it is fed oil form the LPOP. But some folks like to change the extra quart or so of oil that's in there when they do their regular OCs. It doesn't drain when drain the rest, so that's why they suck it out and use that extra quart out of the gallon to fill it. It's also kind of convenient because then you don't have that pesky extra quart of oil left over if you buy 4 gallons. 
Post Fiend
Joined: Jul 2005
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From: 21791
The HPOP is just a gear driven rotary pump that is lubricated by the same oil it pumps. Basically its a set of I thing 5 small pistons that are cam actuated by the rise and fall of a ramp, which basically pushes each piston up and down sucking in LP oil and focing it out under pressure. Just imagine a WWII rotary engine with piston standing up vice outward. The early 99's have a 15* ramp, while the 99.5 and up had a 17* ramp, more pressure, better fuel atomization...
Here, i hate to sound like a correct-it smartass, but ive taken one apart just to see how they work, and it's 7 pistons in the barrel, the barrel rotates with the pistons inside of it, against the fixed swashplate. The main engine lube pump pressure is what keeps the pistons up against the swashplate, also there are springs in the cups to hold them tight as well.. The oil inlet is blocked off as the piston passes BDC on its way up, and then the outlet port opens up at TDC, the volume of oil that can fit down in the cup of the piston plus the stroke of it, is what displaces the oil. It's cam driven correct, but at .85 of cam speed i believe, and the cam spins .5 of the crank. More volume with the same amount of flow=higher pressure
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From: Brinklow Md
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Yeah, early 99, I just get tired of typing it so I figured 98.9 got thepoint across any price idea? I'm on my iPhone and it's kind of hard to surf.
any price idea? I'm on my iPhone and it's kind of hard to surf.
