So my builder recommends a high volume pump
I would suggest looking at your build sheet and seeing exactly what your bearing tolerances are. If they are the stock tolerances then, for your own good, get rid of the HV pump idea.
Last edited by SS RRR; Oct 4, 2010 at 06:42 AM.
That pan is notorious for windage issues. There have been a few here I believe who have changed out the windage tray with success. I would suggest changing out the tray especially if you decide to run a HV pump. I think the ones who have done it used a Moroso tray.
Got a part # on that Moroso?
yea my motor is clearanced very loose and i turn very high rpm.....i run a melling HV with no issues.....for your application i would find out the clearances and go on that....if your builder says a HV is needed then i'd prob listen to him........if you do go HV MAKE SURE you replace the pump driveshaft with a strong all steel/chromoly one from moroso or arp. The stocker WILL fail with a HV pump espically if you use thick oil. ALso I'm running that canton pan and its working great, I have NO windage issues at all. FWIW
Last edited by quik95lt1; Oct 4, 2010 at 10:18 AM.
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think the melling select pump part number is 10554
theres also some things you can do to a hv pump, i read an article somewhere about putting some chamfers on the gears and the housing itself that reduces the volume and pressure some, but cuts down on the horsepower needed to turn the pump..
there is also a melling 10552c thats only 10% more volume instead of the 25% typical of the high volume pumps.. the 10552c also has anti-cavitation grooves in the cover.. seems like these grooves in the cover plate were mentioned in that article i was talking about above..
i wouldnt run anything but the melling select pumps
Last edited by brucer; Oct 4, 2010 at 11:45 AM.
looks a bit messy lol....but stays nice and cool could have something to do with why my cam/lifters and rockers look like they've never even been used even with that big old monster bump stick in there 
think the melling select pump part number is 10554
theres also some things you can do to a hv pump, i read an article somewhere about putting some chamfers on the gears and the housing itself that reduces the volume and pressure some, but cuts down on the horsepower needed to turn the pump..
there is also a melling 10552c thats only 10% more volume instead of the 25% typical of the high volume pumps.. the 10552c also has anti-cavitation grooves in the cover.. seems like these grooves in the cover plate were mentioned in that article i was talking about above..
i wouldnt run anything but the melling select pumps
theres also some things you can do to a hv pump, i read an article somewhere about putting some chamfers on the gears and the housing itself that reduces the volume and pressure some, but cuts down on the horsepower needed to turn the pump..
there is also a melling 10552c thats only 10% more volume instead of the 25% typical of the high volume pumps.. the 10552c also has anti-cavitation grooves in the cover.. seems like these grooves in the cover plate were mentioned in that article i was talking about above..
i wouldnt run anything but the melling select pumps
Talked to my builder again today. The only thing that was needed was a crank polishing and bearing replacement. So either I'll stick with the stocker that I had on there with only 60k miles or replace it with the 10% melling. One of the other guys at the shop said definetly no to the 25% HV pump but the 10% isn't a bad idea with the rpms that I will be hitting.
So, 10% HV or stocker?
So, 10% HV or stocker?
For what its worth and I wouldn't have believed it unless I saw it myself.
I built a 355 for a friends 93 Z28 and put a HV pump in it. At the top of 1st gear it would loose oil pressure. Checked with a manual gauge to verify.
Put a stock pump in it and had a solid 60+ psi at WOT and never dropped off.
Only thing I can figure that it was sucking the pan dry. If you would roll into the gas slowly it wouldn't do it. If you ran it hard it would suck the pan empty.
I built a 355 for a friends 93 Z28 and put a HV pump in it. At the top of 1st gear it would loose oil pressure. Checked with a manual gauge to verify.
Put a stock pump in it and had a solid 60+ psi at WOT and never dropped off.
Only thing I can figure that it was sucking the pan dry. If you would roll into the gas slowly it wouldn't do it. If you ran it hard it would suck the pan empty.
High volume. Not high pressure.
There have been several threads in the past of this happening to those who use a high volume pump with the stock pan resulting in catastrophic failure.
For what its worth and I wouldn't have believed it unless I saw it myself.
I built a 355 for a friends 93 Z28 and put a HV pump in it. At the top of 1st gear it would loose oil pressure. Checked with a manual gauge to verify.
Put a stock pump in it and had a solid 60+ psi at WOT and never dropped off.
Only thing I can figure that it was sucking the pan dry. If you would roll into the gas slowly it wouldn't do it. If you ran it hard it would suck the pan empty.
I built a 355 for a friends 93 Z28 and put a HV pump in it. At the top of 1st gear it would loose oil pressure. Checked with a manual gauge to verify.
Put a stock pump in it and had a solid 60+ psi at WOT and never dropped off.
Only thing I can figure that it was sucking the pan dry. If you would roll into the gas slowly it wouldn't do it. If you ran it hard it would suck the pan empty.