Oil starvation issues SBC HELP?

carl hinkson · 03-21-2016, 02:14 PM

Quote:

Originally Posted by joespanova

Bore gauge.........set to the rod journal.
I'll go .002 if it'll help at this freshen up

If your using a cheap bore gauge with rigid fingers your not going to get a correct clearance. Not to many guys can afford good bore gauges to check bearing clearances.

Here is a thread on different bore gauges.

http://www.performanceboats.com/gn7-...learances.html

Bill Grubbs · 03-21-2016, 02:37 PM

Oil Pump pick-up to close to the pan bottom, or to far from the bottom?

joespanova · 03-21-2016, 04:27 PM

Quote:

Originally Posted by carl hinkson

If your using a cheap bore gauge with rigid fingers your not going to get a correct clearance. Not to many guys can afford good bore gauges to check bearing clearances.

Here is a thread on different bore gauges.

http://www.performanceboats.com/gn7-...learances.html

Carl , as a machinist for the last 35 years and in particular at a major airline ........we don't use / have any "cheap" bore gauges.

Mike Taylor 3601 · 03-21-2016, 05:08 PM

If nothing else try 10550 pump or another that uses 5/8 pickup tube,it fixed a couple engines for me.
That Ultimate II is still good pan that stroke with alum rods shouldn't have any windage issues,we ran that same pan on 9,500 and 10,000 rpm engines with that long of stroke and aluminum and steel rods.
Is pan like Moroso made it?It hasn't been modified or left anything out of it ?
Not overfilled on oil?

I remember first time we used one of those pans we like to never got it on the engine and got in the car and had to pull it for some reason and we thought crap this is going to be bad, with engine sitting right side up it falls off engine,when engine is upside down that pan is virtually impossible to get off or on,so if yours goes off and on with engine upside down may have parts missing.
If remember correctly has teflon coated tray that is practically solid no holes or louvers,and it directs oil it catches into the kickout,only part of pan you can see bottom is area where pickup/pump sets and rest is hidden by windage tray.
with 30wt. and HV pump .0025-.003 clearance should'nt cause issue,those clearances and that pump you should have 60-80lbs oil pressure cold and probably 50-60lbs with 170-190 oil temp idling and when rev should go up,if drops instead it is cavitating from pick up clearance too close or far away,or 3/4 pickup or windage.

Don't assume anything is right out of the box.

Mike Taylor 3601

joespanova · 03-21-2016, 05:25 PM

Mike this pan hasn't been modified. The 10552 c pump is whats in there now with the .750 bore/ tube.
I had a HV55 with a .625 bore...............same problem
It may well BE the vac pump. I'm going to reduce vac , baffle the pump and very likely add an accumulator.
Moroso changed the Ultimate 2 apparently , because mine has a big kick out with tubes going through it ( 3 ) and a SCREEN not a baffle..........and it came this way new in 2001 or so.

pmrphil · 03-21-2016, 05:43 PM

Did you have the pressure drop problem on the first run also, or just the second? What kind of pressure did it carry on the first run? Where is it starting to drop (RPM, gear, how far down the track, etc.) and how far does it drop? From what to what? As much detail you can provide will give everyone looking more to see and quite possibly touch on something someone else has seen.

joespanova · 03-21-2016, 07:18 PM

Quote:

Originally Posted by pmrphil

Did you have the pressure drop problem on the first run also, or just the second? What kind of pressure did it carry on the first run? Where is it starting to drop (RPM, gear, how far down the track, etc.) and how far does it drop? From what to what? As much detail you can provide will give everyone looking more to see and quite possibly touch on something someone else has seen.

I dont have a data logger...........I can't answer that question
.'
All I can share is that it dropped after the second pass. Historically that symptom equates to damage. I trailered it after that.
From what I can conclude "
A tray is better that a screen
I may need to reduce vac
I will baffle the pump as best I can
I may very well add an accusump / accumulator

L79racer · 03-21-2016, 09:10 PM

What crank is in your motor? I had a very similar problem. ruined motor twice. Kept loosing pressure. Thought it was aerating oil. Tried more, then less oil. changed pump, pickups, restrictors no restrictors etc. Finally got new crank and it solved the problem. I had an eagle crank that was crossed drilled from 2006. Machine shop said that they didnt do that anymore. New eagle crank and no more problem. Sounds crazy but everything else in motor was exactly the same.

03-21-2016, 02:37 PM	#2
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 417 Likes: 3 Liked 573 Times in 67 Posts	Re: Oil starvation issues SBC HELP? Oil Pump pick-up to close to the pan bottom, or to far from the bottom?

03-21-2016, 05:08 PM	#4
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,380 Likes: 371 Liked 319 Times in 108 Posts	Re: Oil starvation issues SBC HELP? If nothing else try 10550 pump or another that uses 5/8 pickup tube,it fixed a couple engines for me. That Ultimate II is still good pan that stroke with alum rods shouldn't have any windage issues,we ran that same pan on 9,500 and 10,000 rpm engines with that long of stroke and aluminum and steel rods. Is pan like Moroso made it?It hasn't been modified or left anything out of it ? Not overfilled on oil? I remember first time we used one of those pans we like to never got it on the engine and got in the car and had to pull it for some reason and we thought crap this is going to be bad, with engine sitting right side up it falls off engine,when engine is upside down that pan is virtually impossible to get off or on,so if yours goes off and on with engine upside down may have parts missing. If remember correctly has teflon coated tray that is practically solid no holes or louvers,and it directs oil it catches into the kickout,only part of pan you can see bottom is area where pickup/pump sets and rest is hidden by windage tray. with 30wt. and HV pump .0025-.003 clearance should'nt cause issue,those clearances and that pump you should have 60-80lbs oil pressure cold and probably 50-60lbs with 170-190 oil temp idling and when rev should go up,if drops instead it is cavitating from pick up clearance too close or far away,or 3/4 pickup or windage. Don't assume anything is right out of the box. Mike Taylor 3601

03-21-2016, 05:25 PM	#5
joespanova Senior Member Join Date: Jun 2011 Location: Ga. Posts: 521 Likes: 7 Liked 13 Times in 11 Posts	Re: Oil starvation issues SBC HELP? Mike this pan hasn't been modified. The 10552 c pump is whats in there now with the .750 bore/ tube. I had a HV55 with a .625 bore...............same problem It may well BE the vac pump. I'm going to reduce vac , baffle the pump and very likely add an accumulator. Moroso changed the Ultimate 2 apparently , because mine has a big kick out with tubes going through it ( 3 ) and a SCREEN not a baffle..........and it came this way new in 2001 or so.

03-21-2016, 05:43 PM	#6
pmrphil Member Join Date: Aug 2010 Location: CT Posts: 466 Likes: 1,873 Liked 398 Times in 153 Posts	Re: Oil starvation issues SBC HELP? Did you have the pressure drop problem on the first run also, or just the second? What kind of pressure did it carry on the first run? Where is it starting to drop (RPM, gear, how far down the track, etc.) and how far does it drop? From what to what? As much detail you can provide will give everyone looking more to see and quite possibly touch on something someone else has seen. __________________ Phil Molski PMR Performance S/C 1623

03-21-2016, 09:10 PM	#8
L79racer Member Join Date: Jan 2005 Location: North Massapequa, NY Posts: 218 Likes: 0 Liked 0 Times in 0 Posts	Re: Oil starvation issues SBC HELP? What crank is in your motor? I had a very similar problem. ruined motor twice. Kept loosing pressure. Thought it was aerating oil. Tried more, then less oil. changed pump, pickups, restrictors no restrictors etc. Finally got new crank and it solved the problem. I had an eagle crank that was crossed drilled from 2006. Machine shop said that they didnt do that anymore. New eagle crank and no more problem. Sounds crazy but everything else in motor was exactly the same. Last edited by L79racer; 03-21-2016 at 09:20 PM.