SBC Oil pump

October 28, 2025, 08:45 PM

B KING

quote:
Originally posted by markemark:
^^^^^^ Nice, Like Holleys DA graphs, Thanks! What FPS is the acquisition set to?

Heck, I don't know M & M! Not so sure I even know or if I can set it. I'll have to do some investigation.

2BKING

October 28, 2025, 09:00 PM

markemark

^^^^^ Under Datalog tab, select Setup ECU Logging, and it’s the Logging Rate

October 28, 2025, 09:15 PM

B KING

quote:
Originally posted by markemark:
^^^^^ Under Datalog tab, select Setup ECU Logging, and it’s the Logging Rate

I see nothing like that or in the instructions. Remember my system isn't as robust as yours.

2BKING

October 28, 2025, 09:53 PM

markemark

quote:
Originally posted by B KING:
quote:
Originally posted by markemark:
^^^^^ Under Datalog tab, select Setup ECU Logging, and it’s the Logging Rate

I see nothing like that or in the instructions. Remember my system isn't as robust as yours.

Looked at both Sniper and Terminator X and you are correct.

October 28, 2025, 09:56 PM

B KING

quote:
Originally posted by markemark:
quote:
Originally posted by B KING:
quote:
Originally posted by markemark:
^^^^^ Under Datalog tab, select Setup ECU Logging, and it’s the Logging Rate

I see nothing like that or in the instructions. Remember my system isn't as robust as yours.

Looked at both Sniper and Terminator X and you are correct.

I didn't want to be correct, I was hoping I had it. Not that I know how it would have helped me.

2BKING

October 29, 2025, 06:32 AM

CURTIS REED

Mark, the next time you have it out you might check that the relief valve opens all the way. That guy Carl that used to be all over the forum going by CNCNORTHEAST posted pictures of Melling pumps relief valves only opening half way. Could be your issue.

October 29, 2025, 07:30 AM

B KING

quote:
Originally posted by markemark:
When doing a burnout, the oil pressure is always 90+ @ 6500 - 7000.

Little off topic, but why the high to me burnout rpm? Not just you but seems like others like higher rpm for the burnout.

I do a high gear burnout & try keep the rpm at 4500, sometimes I get to 5000 rpm.

2BKING

October 29, 2025, 09:54 AM

Canted Valve

I think most of us respect David Reher, for good reason. This thread reminded me of one of his old Tech Talk articles. It has some good, hard learned I'm sure, practices for burnouts.

https://rehermorrison.com/tech...abusing-your-engine/

October 29, 2025, 10:25 AM

markemark

quote:
Originally posted by CURTIS REED:
Mark, the next time you have it out you might check that the relief valve opens all the way. That guy Carl that used to be all over the forum going by CNCNORTHEAST posted pictures of Melling pumps relief valves only opening half way. Could be your issue.

I agree that this is probably a pump problem. I had this exact same 10552 pump (not ST) in my SHP prior (2017-19) and never seen this excessive pressure at converter flash, but didn’t have DA either. This pump is only 10% more volume / pressure and was recommended by Carl Hinkson for the SHP / Little M engines as a better than standard volume upgrade when Dart recommended standard volume oil pumps only. He showed these in many of his Dart sbc builds.

I sent Melling Tech a question this morning about pump pressure at converter flash along with a pic of the DA I posted here and will post what they respond.

This Little M engine is being replaced next spring and there is only one last 4 day November event that I’m possibly attending in FL weather depending. The rebuilt SHP replacement has a new 10552ST pump also.

October 29, 2025, 10:31 AM

CURTIS REED

quote:
Originally posted by markemark:
quote:
Originally posted by CURTIS REED:
Mark, the next time you have it out you might check that the relief valve opens all the way. That guy Carl that used to be all over the forum going by CNCNORTHEAST posted pictures of Melling pumps relief valves only opening half way. Could be your issue.

I agree that this is probably a pump problem. I had this exact same 10552 pump (not ST) in my SHP prior (2017-19) and never seen this excessive pressure at converter flash, but didn’t have DA either. This pump is only 10% more volume / pressure and was recommended by Carl Hinkson for the SHP / Little M engines as a better than standard volume upgrade when Dart recommended standard volume oil pumps only. He showed these in many of his Dart sbc builds.

I sent Melling Tech a question this morning about pump pressure at converter flash along with a pic of the DA I posted here and will post what they respond.

This Little M engine is being replaced next spring and there is only one last 4 day November event that I’m possibly attending in FL weather depending. The rebuilt SHP replacement has a new 10552ST pump also.

Let us know what you find. The issue I posted about is easy to see. Pushing the relief open manually it would only uncover half of the hole.

October 29, 2025, 11:30 AM

markemark

quote:
I sent Melling Tech a question this morning about pump pressure at converter flash along with a pic of the DA I posted here and will post what they respond.

From Melling Tech:

The high pressure is likely due to too much oil pump volume output for the engine's flow needs. I would recommend the standard volume oil pump (10554ST ) like Dart does for use with their priority main oil system blocks. All of the Melling SBC Select pumps come with a pink 70psi spring in the relief valve and the optional 60psi yellow spring. The two extra feature high volume pumps, 10552ST and 10555ST, also include the 80psi green spring.

October 29, 2025, 12:08 PM

CURTIS REED

So they are saying in essence that their relief valve isn't large enough to keep the pressure spike down?

October 29, 2025, 01:01 PM

markemark

quote:
Originally posted by B KING:Little off topic, but why the high to me burnout rpm? Not just you but seems like others like higher rpm for the burnout.
I do a high gear burnout & try keep the rpm at 4500, sometimes I get to 5000 rpm.

Here’s my method using 32x14 bias. I roll through the water box (1 time) and stop 5’+ out. Put trans in 3rd gear. I spend 1-2 seconds max with LL (7200 chip limited) engaged and driving out with my foot in it maintaining that high 6xxx rpm (7500 chip limited). When I feel the tires wanting to pull the engine down I lift, no chirping usually. There’s no cloud/s of smoke behind the car, but a haze of smoke instead. Lower rpm pulls engine down too soon.

October 29, 2025, 02:05 PM

B KING

quote:
Originally posted by markemark:
quote:
Originally posted by B KING:Little off topic, but why the high to me burnout rpm? Not just you but seems like others like higher rpm for the burnout.
I do a high gear burnout & try keep the rpm at 4500, sometimes I get to 5000 rpm.

Here’s my method using 32x14 bias. I roll through the water box (1 time) and stop 5’+ out. Put trans in 3rd gear. I spend 1-2 seconds max with LL (7200 chip limited) engaged and driving out with my foot in it maintaining that high 6xxx rpm (7500 chip limited). When I feel the tires wanting to pull the engine down I lift, no chirping usually. There’s no cloud/s of smoke behind the car, but a haze of smoke instead. Lower rpm pulls engine down too soon.

Thanks for the explanation!

2BKING

October 29, 2025, 02:09 PM

Goob

quote:
Originally posted by markemark:
What I don’t understand is the oil pressure rises to 89 psi for 10w30 or 100 psi for 10w40 during the converter flash period and then drops into the mid-60s and maintains this with an 8-10 psi fluctuation. When doing a burnout, the oil pressure is always 90+ @ 6500 - 7000.

If this pump (Melling 10552 ST) had a 60 psi pressure relief spring standard, would this oil pressure graph below not be correct?? Pressure never drops below 60 psi. How does this work??

Overfilled pan, or poor baffling in the pan? In the burnout you're sitting still, on converter flash all the oil is in the back of the pan and splashing up into the rotating assembly, aerating the oil??
First thing, I'd run a quart less oil and see if the graphs change.

October 29, 2025, 02:12 PM

B KING

quote:
Originally posted by Canted Valve:
I think most of us respect David Reher, for good reason. This thread reminded me of one of his old Tech Talk articles. It has some good, hard learned I'm sure, practices for burnouts.

https://rehermorrison.com/tech...abusing-your-engine/

I like their tech articles!

That one seemed to mainly address the burnout rpm limiter. Except for their low rpm burnout with a Pro Stock engine.

I haven't found any issues with doing a low rpm burnout without a limiter when I was NA or now Supercharged. I put a lot of runs on my engines before a refresh.

2BKING

October 29, 2025, 02:24 PM

Goob

quote:
Originally posted by Canted Valve:
I think most of us respect David Reher, for good reason. This thread reminded me of one of his old Tech Talk articles. It has some good, hard learned I'm sure, practices for burnouts.

https://rehermorrison.com/tech...abusing-your-engine/

Tire engineers have said "get the tires to finish line RPM at some time during the burnout."
I differ with the David Reher theory of not finishing the burnout on the throttle.
I purposely get to W.O.T., to refresh the fuel in the secondary accelerator pump and metering wells.

**Full disclosure:**
I have tagged an exhaust valve during the burnout once, just got over exuberant (7100+) getting up on the tires and snapped the throttle shut real quick, heard a TING! noise out of the header, followed by the dead cylinder idle sound. Car ran dead on. Made 3 more runs that day, then replaced the valve. About 400 runs later that exhaust seat shattered.