HO oil pump ??
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Joined: May 2006
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From: Kingsport, TN
HO oil pump ??
Have been "prepping" for a 360/390 rebuild for a while... Just what is the difference - adding a "high volume" oil pump ? With hyd. lifters does that change the lift duration or ?? Does that have any effect on HP rating ? Am considering an RV cam.
Tuned
Joined: Mar 2009
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From: Napa
If you're doing a long-life mild pickup/RV type engine with stock-type bearing clearances, it's usually considered better to stay with the standard volume pump, as the extra volume isn't necessary with tight clearances, and the unused volume that just gets bypassed will just beat 'n heat the oil, and the HV pump also consumes more power to turn it, which is an unnecessary loss as the extra volume isn't needed. If you were doing a hotrod or race engine with loose clearances, like .0025/.0035, then you'd want the HV pump to keep up with the "leaks"
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From: Kingsport, TN
HV oil pump
MeanGean - Thanks for the info - Just asking to find out IF there was a difference in performance. STILL interested in IF there is a difference because of a high volume / hydrolic lifters ? I would assume (not knowing) that a higher volume would make a difference in the "action" of the hydrolic lifters OR that the tappet clearance might be different. Trying to find out ALL possible questions/options before I get started - AND have the right parts on-hand before the build gets started. Again, Thanks.
Cargo Master
Joined: Aug 2000
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From: SW Michigan
oil pumps
George, the hydralic lifters have a clip in the top that lets them pump up only so far. Going to a HV oil pump won't give you any more valve lift than a standard pump. . DinosaurFan
Tuned
Joined: Mar 2009
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From: Napa
All a HV pump does is make a larger volume of oil available if needed, which an engine with stock-type clearances doesn't need, and just gets bled off by the relief spring. The lifters either have enough oil or they don't- their action doesn't change because of what oil pump is on it. Makes me curious, though, where that idea came from? Never heard that particular theory or question before- just wonder how you got on that path?
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From: Kingsport, TN
MeanGene427 - Just an off-the-wall question. Have worked with hydrolics - usually, more volume means faster action in the cylinder, etc. - same for pneumatics.
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Tuned
Joined: Mar 2009
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From: Napa
Now your question makes sense, given your background- in tractor & machine hydraulics, steering systems, etc., yeah. Think of hydraulic lifters as more like a shock absorber for the valvetrain, used to eliminate the need for lash in the system and give quieter operation. They don't move they valves hydraulically like a machine control cylinder, they just function as the shock absorber between mechanical motion on each end. There really isn't a big flow situation through the lifter, it just has fluid inside, and the quantity stabilizes at zero lash, oil always available under pressure coming in, and controlled leakage going out- as long as there's enough oil to keep the lifter in supply, it's OK. If the oil supply is inadequate or stops, the lifter will lose enough oil through leakage after a few cycles to open up some internal lash, and then the noise starts.
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From: Kingsport, TN
MeanGene427 - Thanks for the DETAILED info - understood. Just trying to get all possible details worked out / understood before I rebuild the FE. < tear it apart w/ silly questions & somebody that knows more should have the proper/correct answer. Again, Thanks.
