Oil pressure question

ss3011 · 07-31-2018, 05:24 PM

Here are the typical questions , was that the pressure when the engine was new ? Are you sure the pressure gauge is reading correctly Other questions are what type of lifters do you run ? Are the lifter galleries restricted ? I am with you , would rather see 60 psi at speed.

Ron Gusack · 07-31-2018, 07:43 PM

Quote:

Originally Posted by ss3011

Here are the typical questions , was that the pressure when the engine was new ? Are you sure the pressure gauge is reading correctly Other questions are what type of lifters do you run ? Are the lifter galleries restricted ? I am with you , would rather see 60 psi at speed.

I think that was the pressure when it was new, or at least it was very close to that. I have a Racepak but I don't log oil pressure yet.
I'm not sure the gauge is correct because I have a small copper line going to it. It's a SW mechanical gauge that is very old.
The lifter galleys aren't restricted but my pushrods are restricted to .028.
Lifters are Crower Hippo severe duty.
I learned that 10 lbs per 1k rpm was old school and over kill. I know that volume and pressure are different too. That's why I went with a standard volume pump but 40 at 6300 has me a little nervous. It might not be much higher at 7k when I run 1/4 mile. I need to start logging it or at the very least put a larger ID line to it.

FED 387 · 07-31-2018, 08:16 PM

maybe take the oil pressure reading off the FRONT of the block instead of the back of the block as the front is the LAST place that sees oil in the system if it is not looking bad inside I would not be overly concerned-- maybe next pass look at the oil gauge and see what it reads say at half track and thru the lights too will give you an idea of what your pressure is at various spots on the track--- FED 387

MAURICE BLENDHEIM · 07-31-2018, 08:42 PM

Ron… X2 on taking oil pressure from the front of the engine. Oil pressure reading will be after all internal leakage. MB

Ron Gusack · 07-31-2018, 10:41 PM

The pressure is about 50 at 2500 against the converter, goes up to 55ish on launch, then drops to low 40's for the rest of the run. After the stripe it climbs up a little. I put a gopro in it for one pass a couple weeks ago.

I've taken it from the #1 main before, is that good enough or is it better to get from the end of that galley? Is -4 braided what most use?

The last race of the 2017 season I over reved it bad on one run and I'm waiting for the analysis from that oil now. I hit 8400 in 1st gear and somehow it stayed together. Maybe this analysis will paint a different picture.

Mike Pearson · 08-01-2018, 08:47 AM

Ron,
I have been running a Moroso Billet pump in my 350. I had one of the Melling pumps break off and kill the engine. No more Melling pumps for me. Could be an issue with the pump. The billet pump does not have a standard pick up. it pulls the oil right from the bottom of the pump.

bry-war · 08-01-2018, 09:05 AM

Quote:

Originally Posted by Mike Pearson

Ron,
I have been running a Moroso Billet pump in my 350. I had one of the Melling pumps break off and kill the engine. No more Melling pumps for me. Could be an issue with the pump. The billet pump does not have a standard pick up. it pulls the oil right from the bottom of the pump.

Order up rebuild parts for your moroso billet pump and you will get melling parts.

BW

Nmbr1GMfan · 08-06-2018, 08:18 AM

Quote:

Originally Posted by Ron Gusack

The pressure is about 50 at 2500 against the converter, goes up to 55ish on launch, then drops to low 40's for the rest of the run. After the stripe it climbs up a little.

I had an issue like this once and it was the distributor body not sealing.

Coleydog · 08-06-2018, 11:54 AM

Quote:

Originally Posted by Ron Gusack

I think that was the pressure when it was new, or at least it was very close to that. I have a Racepak but I don't log oil pressure yet.
I'm not sure the gauge is correct because I have a small copper line going to it. It's a SW mechanical gauge that is very old.
The lifter galleys aren't restricted but my pushrods are restricted to .028.
Lifters are Crower Hippo severe duty.
I learned that 10 lbs per 1k rpm was old school and over kill. I know that volume and pressure are different too. That's why I went with a standard volume pump but 40 at 6300 has me a little nervous. It might not be much higher at 7k when I run 1/4 mile. I need to start logging it or at the very least put a larger ID line to it.

Did you bleed the oil guage? I've had air trapped in the line and gave weird readings, looked at everything untill it was found.

07-31-2018, 08:16 PM	#3
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,418 Likes: 523 Liked 332 Times in 180 Posts	Re: Oil pressure question maybe take the oil pressure reading off the FRONT of the block instead of the back of the block as the front is the LAST place that sees oil in the system if it is not looking bad inside I would not be overly concerned-- maybe next pass look at the oil gauge and see what it reads say at half track and thru the lights too will give you an idea of what your pressure is at various spots on the track--- FED 387

07-31-2018, 08:42 PM	#4
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 569 Likes: 309 Liked 284 Times in 87 Posts	Re: Oil pressure question Ron… X2 on taking oil pressure from the front of the engine. Oil pressure reading will be after all internal leakage. MB

07-31-2018, 10:41 PM	#5
Ron Gusack Member Join Date: Feb 2009 Posts: 244 Likes: 1 Liked 7 Times in 6 Posts	Re: Oil pressure question The pressure is about 50 at 2500 against the converter, goes up to 55ish on launch, then drops to low 40's for the rest of the run. After the stripe it climbs up a little. I put a gopro in it for one pass a couple weeks ago. I've taken it from the #1 main before, is that good enough or is it better to get from the end of that galley? Is -4 braided what most use? The last race of the 2017 season I over reved it bad on one run and I'm waiting for the analysis from that oil now. I hit 8400 in 1st gear and somehow it stayed together. Maybe this analysis will paint a different picture.

08-01-2018, 08:47 AM	#6
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,445 Likes: 614 Liked 1,919 Times in 576 Posts	Re: Oil pressure question Ron, I have been running a Moroso Billet pump in my 350. I had one of the Melling pumps break off and kill the engine. No more Melling pumps for me. Could be an issue with the pump. The billet pump does not have a standard pick up. it pulls the oil right from the bottom of the pump. __________________ Mike Pearson 2485 SS

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07-31-2018, 05:24 PM	#1
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Oil pressure question Here are the typical questions , was that the pressure when the engine was new ? Are you sure the pressure gauge is reading correctly Other questions are what type of lifters do you run ? Are the lifter galleries restricted ? I am with you , would rather see 60 psi at speed.