At what point do I need a HV oil pump
03-21-2014, 12:28 PM
#1
Staging Lane
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At what point do I need a HV oil pump Looking for answers with experience please. Building a 370ci LQ4. Looking to spin no more than 7500 rpm. Is a ported stock pump up to the task?
03-21-2014, 01:53 PM
#2
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You're also going to need an oil pan with a higher-capacity sump, or run an accumulator. Otherwise, you risk the stock pan being pumped dry . . . No oil pressure . . . BOOM ! ! !
03-21-2014, 02:33 PM
#6
Frankly I'd rather spend less on a nice Melling pump, those ported LS6s I've seen run in the 170+ range when the Melling is just over 100.
I went with a new LS6 on mine because I got it for cheap at 70 bux and I just wanted a stock replacement. But if I was going to spend more than that, it would not be for a ported LS6 for 100 bux more.
I went with a new LS6 on mine because I got it for cheap at 70 bux and I just wanted a stock replacement. But if I was going to spend more than that, it would not be for a ported LS6 for 100 bux more.
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03-21-2014, 08:11 PM
#13
You need an oil pump capable of supplying enough oil for your bearing clearances. As bearing clearances increase so does the need for a greater volume of oil to maintain the wedge. The ls1 engines were designed to run thinner oils. You don't need to put 0w10 but you also don't need 20w50. Use the viscosity that your engine was designed for. The Melling is a good choice but one area you should address is reducing aeration of the oil.
03-21-2014, 08:12 PM
#14
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You need an oil pump capable of supplying enough oil for your bearing clearances. As bearing clearances increase so does the need for a greater volume of oil to maintain the wedge. The ls1 engines were designed to run thinner oils. You don't need to put 0w10 but you also don't need 20w50. Use the viscosity that your engine was designed for. The Melling is a good choice but one area you should address is reducing aeration of the oil.
03-21-2014, 11:46 PM
#17
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03-22-2014, 10:25 AM
#19
If it is a bypass flow setup of some sort siphoning partial flow away from main flow certainly, like maybe a turbo or ultra high efficiency bypass filtration, but if full flow as I thought most setups typically were how would a HV pump help?
HV pumps go into bypass at a lower rpm given the same bearing clearances, once at the same bypass pressure standard volume and HV are going to push the same amount through bearings and on high rpm motors all that ectra oil in bypass is just getting heated up more, and increasing the likelyhood of cavitation, flooding the valvecovers or draining the pan.
Unless bearing clearances are extra wide using high rpm as the excuse for HV is actually specifically contradictory to reasonable thought because either pump would likely be in bypass long before the higher rpm is reached.
If one stops and thinks about it a HV pump makes more sense on a low rpm motor that never spins the pump fast enough to create extra flow, it will move more oil at those low rpms.
03-22-2014, 10:28 AM
#20
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If it is a bypass flow setup of some sort siphoning partial flow away from main flow certainly, like maybe a turbo or ultra high efficiency bypass filtration, but if full flow as I thought most setups typically were how would a HV pump help?
HV pumps go into bypass at a lower rpm given the same bearing clearances, once at the same bypass pressure standard volume and HV are going to push the same amount through bearings and on high rpm motors all that ectra oil in bypass is just getting heated up more, and increasing the likelyhood of cavitation, flooding the valvecovers or draining the pan.
Unless bearing clearances are extra wide using high rpm as the excuse for HV is actually specifically contradictory to reasonable thought because either pump would likely be in bypass long before the higher rpm is reached.
If one stops and thinks about it a HV pump makes more sense on a low rpm motor that never spins the pump fast enough to create extra flow, it will move more oil at those low rpms.
HV pumps go into bypass at a lower rpm given the same bearing clearances, once at the same bypass pressure standard volume and HV are going to push the same amount through bearings and on high rpm motors all that ectra oil in bypass is just getting heated up more, and increasing the likelyhood of cavitation, flooding the valvecovers or draining the pan.
Unless bearing clearances are extra wide using high rpm as the excuse for HV is actually specifically contradictory to reasonable thought because either pump would likely be in bypass long before the higher rpm is reached.
If one stops and thinks about it a HV pump makes more sense on a low rpm motor that never spins the pump fast enough to create extra flow, it will move more oil at those low rpms.