low volume oil pump

Weekend Racer · 02-15-2014, 07:45 PM

I plan to use schumann low volume ,low pressure oïl pump in my chevy 350 SS/HA.The main bearing clearance are at .0029 +/1 .0001
. What oïl pressure I can expect?.
Thank!

Alan Roehrich · 02-15-2014, 07:56 PM

So, you're running a -10% volume pump and what amounts to 0.003" on the mains? What is your clearance on the rods? What oil?

Weekend Racer · 02-15-2014, 09:37 PM

Sorry,you should read main bearing clearance are at .0029 +/- .0001. The rod clearance are at .0026. +/- .0001. The rod side clearance are at .014. 15W 40 oïl .
Thank!

Ed Wright · 02-15-2014, 09:48 PM

That's a lot of oil clearance for a low volume pump, isn't it?
Which rod journals?

Weekend Racer · 02-15-2014, 10:09 PM

rod journal are at 2.0995

carl hinkson · 02-15-2014, 10:29 PM

Quote:

Originally Posted by Weekend Racer

rod journal are at 2.0995

What are you using to come up with that clearance?

Alan Roehrich · 02-15-2014, 11:10 PM

Quote:

Originally Posted by Weekend Racer

Sorry,you should read main bearing clearance are at .0029 +/- .0001. The rod clearance are at .0026. +/- .0001. The rod side clearance are at .014. 15W 40 oïl .
Thank!

So, for all intents and purposes, that's about 0.003" on the mains, and 0.0025" on the rods.

Too much clearance for a -10% volume pump. And 15W40 is not really a good oil choice, either. You'll have about 10 psi hot at an idle of 800 RPM. And maybe 50 psi at 6000-7000 RPM.

Ed Wright · 02-16-2014, 10:07 AM

Quote:

Originally Posted by Alan Roehrich

So, for all intents and purposes, that's about 0.003" on the mains, and 0.0025" on the rods.

Too much clearance for a -10% volume pump. And 15W40 is not really a good oil choice, either. You'll have about 10 psi hot at an idle of 800 RPM. And maybe 50 psi at 6000-7000 RPM.

I think that is too much period.

Jim Hanig · 02-17-2014, 12:56 PM

Quote:

Originally Posted by Ed Wright

I think that is too much period.

Ed what would you have for rod $main clearance

02-15-2014, 07:45 PM	#1
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 67 Likes: 1 Liked 1 Time in 1 Post	low volume oil pump I plan to use schumann low volume ,low pressure oïl pump in my chevy 350 SS/HA.The main bearing clearance are at .0029 +/1 .0001 . What oïl pressure I can expect?. Thank!

02-15-2014, 07:56 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,969 Likes: 1,127 Liked 1,217 Times in 312 Posts	Re: low volume oil pump So, you're running a -10% volume pump and what amounts to 0.003" on the mains? What is your clearance on the rods? What oil? __________________ Alan Roehrich 212A G/S

02-15-2014, 09:37 PM	#3
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 67 Likes: 1 Liked 1 Time in 1 Post	Re: low volume oil pump Sorry,you should read main bearing clearance are at .0029 +/- .0001. The rod clearance are at .0026. +/- .0001. The rod side clearance are at .014. 15W 40 oïl . Thank!

02-15-2014, 09:48 PM	#4
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: low volume oil pump That's a lot of oil clearance for a low volume pump, isn't it? Which rod journals? __________________ Ed Wright 4156 SS/JA

02-15-2014, 10:09 PM	#5
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 67 Likes: 1 Liked 1 Time in 1 Post	Re: low volume oil pump rod journal are at 2.0995