HV Oil Pump Issues.
Re: HV Oil Pump Issues.
Originally Posted by My Iroc Z28
Can you shoot me part numbers for your pan, pump & pickup?
Canton PN 20-023 and PN 20-013 are given as the pickups.
20-013 Pickup for SM. BL. S.V. M155 3/4" dia.
20-023 Pickup for S.B.H.V. with 3/4" tube Melling #M155HV.
I'll PM a website that has a good picture of it going onto an LT1 rebuild.
I found the normal Canton site but as you might have expected, the prices direct from Canton are more expensive than the distributors. I have cantons on both my Z28's now. Both are 'road race' style with the wings and mutliple doors. Great pieces. I'll send you links to Cantons site as well as a less expensive distributor.
Re: HV Oil Pump Issues.
I can also atest to the fact that the HV pump will suck the stock pan dry. At WOT my oil pressure dropped 10-15 psi. It would then come back up slowly. At part throttle the car ran at 50 psi. Spun a bearing with less the 4000 miles on a forged 355. Went back to a stock pump with a high pressure spring (white) and now at WOT the car has 65 psi and no drop in pressure still on the stock pan. I have more pressure now and no drop at WOT. HV pump and stock pan. BAD IDEA!!!!!!!!
HVY SS
HVY SS
I didn't read the rest of this thread, but something I have not seen is this
HV pumps seem to work good on ported stock heads, but are blamed for"sucking the pan dry" on aftermarket heads
but, 99% of aftermarket heads have smaller then stock oil drain back holes, that limit the volume of oil returning to the pan
therefor, I think what some people experiance is not so much the HV pump "sucking the pan dry", as it is the pump overwheming the ability of the oil drainback holes in the heads to return that high volume of oil BACK to the pan, which still sucks the pan dry, but not on its own
HV pumps seem to work good on ported stock heads, but are blamed for"sucking the pan dry" on aftermarket heads
but, 99% of aftermarket heads have smaller then stock oil drain back holes, that limit the volume of oil returning to the pan
therefor, I think what some people experiance is not so much the HV pump "sucking the pan dry", as it is the pump overwheming the ability of the oil drainback holes in the heads to return that high volume of oil BACK to the pan, which still sucks the pan dry, but not on its own
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LS1 Based Engine Tech
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