high volume oil pump
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 49
Likes: 0
From: Hillard Ohio
high volume oil pump
My oil pressure is dropping once I get past 5,000 rpms. Fresh engine. Checked the clearances myself when I assembled the engine. I'm thinking that the hi volume pump is sucking the pan dry.
It's a sealed power hi volume pump. I cleaned the pick up before installing and it was operating room clean before I installed it. Set the pick up 1/4" from the bottom of the oil pan. Three generous tack welds with a mig welder hold it in place. Heads are brand new so the return holes can't be plugged.
I can cruise all day and I get 50 psi @ 3000 rpm, but like I said, once I hit 5,000 it starts dropping rapidly! Thoughts?
I'm thinking of pulling the mill and installing a stock or Z-28 pump. Anyone have a part number?
rocky
It's a sealed power hi volume pump. I cleaned the pick up before installing and it was operating room clean before I installed it. Set the pick up 1/4" from the bottom of the oil pan. Three generous tack welds with a mig welder hold it in place. Heads are brand new so the return holes can't be plugged.
I can cruise all day and I get 50 psi @ 3000 rpm, but like I said, once I hit 5,000 it starts dropping rapidly! Thoughts?
I'm thinking of pulling the mill and installing a stock or Z-28 pump. Anyone have a part number?
rocky
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Re: high volume oil pump (rocky1)
All Speed-Pro p/n for sbc:
224-4146 -- OE replacement OP
224-4146A -- Hi Press Z-28 style OP
224-14227 -- OE replacement op SCREEN for corvette
224-6146E -- HD op SHAFT w/integral steel guide
224-4146 -- OE replacement OP
224-4146A -- Hi Press Z-28 style OP
224-14227 -- OE replacement op SCREEN for corvette
224-6146E -- HD op SHAFT w/integral steel guide
Burning Brakes
Joined: Mar 2001
Posts: 1,211
Likes: 5
From: Nashville TN
Re: high volume oil pump (tsw71)
put a reliable mechanical gauge on the motor and monitor your oil pressure. The oem gauges are not super accurate, especially after you kick of the pressure a little bit.
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 49
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From: Hillard Ohio
Re: high volume oil pump (jackson)
So, the 224-4146A is the one I need. I noticed it is about 1/2 the price of the dealer price of the GM Z-28 pump. Is it identical?
Mechanical Autometer gauges. Pretty sure it is accurate.
Mechanical Autometer gauges. Pretty sure it is accurate.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Re: high volume oil pump (rocky1)
So, the 224-4146A is the one I need. I noticed it is about 1/2 the price of the dealer price of the GM Z-28 pump. Is it identical?
Mechanical Autometer gauges. Pretty sure it is accurate.
Mechanical Autometer gauges. Pretty sure it is accurate.
A "possible" cause of low press at Hi rpm is oil aeration. Perhaps a windage tray/improved windage tray in your oil pan could help
[Modified by jackson, 10:26 AM 10/10/2002]
Drifting
Joined: Mar 2001
Posts: 1,396
Likes: 7
From: Indiana
Re: high volume oil pump (jackson)
If you're already going to change pumps, get yourself a rear pan baffle. This is a flat piece that goes between the pump and rear main cap and keeps oil from climbing up the rear of the pan under hard acceleration. They're only a few $$. I know moroso makes them as well as a few other companies too.
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Race Director
Joined: Oct 2000
Posts: 15,044
Likes: 79
From: central FL, near the beach.
Re: high volume oil pum
with 10w30 oil i noticed a big drop past 4500, std pump, high pressure.
20w50 made a big improvement.
i then added a rearbaffle and scraper.
found it is steady 65 if oil temp is under 230.
added oil/water heat exchanger.
Using a 3/16 oil line(stock 1/8 line reacts too slow)
20w50 made a big improvement.
i then added a rearbaffle and scraper.
found it is steady 65 if oil temp is under 230.
added oil/water heat exchanger.
Using a 3/16 oil line(stock 1/8 line reacts too slow)
Melting Slicks
Joined: Mar 2002
Posts: 3,193
Likes: 0
From: Pittsburgh PA
Re: high volume oil pump (rocky1)
I doubt you're sucking the pan dry at 5,000 RPM, unless you're flying around a sharp turn. If you WERE sucking it dry, that means that you'd be starving your engine of oil... and I don't think it would survive at 5,000 RPM, even for a second or two. It's either the gauge, as someone mentioned, or...
How fresh is the engine? You could have a lot of junk in your filter from the break in. Instead of buying a larger oil pan, maybe get a top quality, higher quantity oil filter.
Goodluck, let us know how it turns out.
Jerry
[Modified by jerryjfunk, 6:28 AM 10/11/2002]
How fresh is the engine? You could have a lot of junk in your filter from the break in. Instead of buying a larger oil pan, maybe get a top quality, higher quantity oil filter.
Goodluck, let us know how it turns out.
Jerry
[Modified by jerryjfunk, 6:28 AM 10/11/2002]
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 49
Likes: 0
From: Hillard Ohio
Re: high volume oil pump (jerryjfunk)
I'm sure the pan isn't TECHNICALLY dry, but I do know that something is going on. Maybe aeration or cavitation.
Brand new Autometer mechanical gauge so I'm pretty sure it is reading right. Less than 5,000 miles on the engine. First couple of oil changes I cut the filters apart. Couple of TINY specks of RTV and cam lube in the first one, NOTHING in the others.
Rocky
[Modified by rocky1, 12:13 PM 10/11/2002]
Brand new Autometer mechanical gauge so I'm pretty sure it is reading right. Less than 5,000 miles on the engine. First couple of oil changes I cut the filters apart. Couple of TINY specks of RTV and cam lube in the first one, NOTHING in the others.
Rocky
[Modified by rocky1, 12:13 PM 10/11/2002]
Melting Slicks
Joined: Mar 2002
Posts: 3,193
Likes: 0
From: Pittsburgh PA
Re: high volume oil pump (rocky1)
Yeah, you're probably right. Maybe an oil pan with baffels and all of the other cool features? :cool: I'm just saying that I've been told by more than one race engine builder that a high volume/pressure pump doesn't require a larger oil pan.
Jerry
Jerry
Le Mans Master
Joined: Aug 2000
Posts: 6,273
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From: Austin TX
Re: high volume oil pump (rocky1)
I agree with TSW. A few years back I installed a rebuild with a HV pump and a stock 5 qt pan. In about 2500 miles of city mid rpm driving, I spun a main bearing. Breakdown indicated oil starvation.
Most sources I've talked to since then recommend a GM OE design oil pump for street driving.
Most sources I've talked to since then recommend a GM OE design oil pump for street driving.
Pro
Joined: Aug 2000
Posts: 713
Likes: 1
From: plymouth mass
Re: high volume oil pump (rocky1)
Hi Rocky1: I have a melling HV pump on my engine, It's had been past 5000 many times with no problems. I have the stock pan on my engine, I do have however a windage tray. Chuck D
