l99 low oil pressure - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

morepowerjoe · 02-27-2021, 06:10 PM

I didn't want to hi jack the "lowish oil pressure" post. So I've noticed my oil pressure sitting at 15psi at idle in gear when hot. Isn't the rule for every 1000 rpm your supposed to have 10psi of oil pressure? Or are my bearings just shot?

morepowerjoe · 03-01-2021, 09:06 AM

Well I figured out why my oil pressure is low. I was reading all the post on low oil pressure and found out that when I replaced the oil pump in my engine I put the wrong oil pump in. Like I said I was reading the post and seen the part numbers that everyone was posting and realized that I had put in the melling part number M365 which is a standard volume oil pump and I should have put the melling high pressure 10295 in because Ihave the l99.

My only question is when I do the l99 afm delete, will the pressure go back up or should I pull the pump and replace it with the right one?

TheFlyingBananaSS · 03-01-2021, 09:19 AM

Not sure on that . I think my builder put the 10295 in mine. I did the afm delete but kept my VVT.

morepowerjoe · 03-01-2021, 09:33 AM

Quote:

Originally Posted by TheFlyingBananaSS

Not sure on that . I think my builder put the 10295 in mine. I did the afm delete but kept my VVT.

I'm going to keep the vvt also. I just don't know if that will use more oil or just the afm lifters use more oil.

Greenhornet2 · 03-01-2021, 02:16 PM

you're pressure isn't going to go up. If you aren't running the AFM you may not need the higher volume and will likely be fine.

morepowerjoe · 03-04-2021, 01:58 AM

Quote:

Originally Posted by Greenhornet2

you're pressure isn't going to go up. If you aren't running the AFM you may not need the higher volume and will likely be fine.

I currently use mobile one 5w30 oil and filter. Do you think that I should go to a heavier weight oil like 40 weight?

InFiD3ViL · 03-04-2021, 03:01 AM

Quote:

Originally Posted by morepowerjoe

I currently use mobile one 5w30 oil and filter. Do you think that I should go to a heavier weight oil like 40 weight?

No. That's treating the symptom, not the cause. These engines are designed for 5w30 due to their tighter tolerances/clearances.

morepowerjoe · 03-04-2021, 03:10 AM

Quote:

Originally Posted by InFiD3ViL

No. That's treating the symptom, not the cause. These engines are designed for 5w30 due to their tighter tolerances/clearances.

I'm just consurned of the 15 psi at hot idle. But I was reading on all data and it says minimum oil pressure is 24 psig at 1000 rpm which I don't know what the g stands for but I have a little bit over 25 or so psi at 1000 rpm. My car idles at 500 rpm so do you think that is acceptable?

JamesMyBoy · 03-04-2021, 06:31 AM

The "g" stands for gauge.
At sea level, the weight of the air above you is 14.7 pounds... That is called absolute pressure. So, if your gauge is reading 15 psig, that equals 19.7 psia.
Or, if you have a gauge laying on your workbench, it reads zero (gauge), but you and it have 14.7 psia on you. The higher elevation you are at, the lower the absolute pressure, since there's less air above you.
Gauge pressure is all that really matters, unless you work in a vacuum :-)

morepowerjoe · 03-04-2021, 07:56 AM

Thanks for the clarification, but what I really need to know is whether or not my oil pressure at 15 psi at a hot idle, in gear, at 500 rpm is ok?

TheFlyingBananaSS · 03-04-2021, 08:04 AM

There are ways to get a more accurate reading from the OBD port.

Ashen 6.2 · 03-04-2021, 08:10 AM

Quote:

Originally Posted by TheFlyingBananaSS

There are ways to get a more accurate reading from the OBD port.

^^^This^^^ The gauges are good for general info and thats about it. Would be best to get a reading from the OBD port to see what the oil pressure really is.

morepowerjoe · 03-04-2021, 08:22 AM

Quote:

Originally Posted by Ashen 6.2

^^^This^^^ The gauges are good for general info and thats about it. Would be best to get a reading from the OBD port to see what the oil pressure really is.

I didn't even think of that, thanks. But if it reads 15 psi should I be worried?

Risingson05 · 03-04-2021, 08:34 AM

I installed to 10295 and my oil pressure dropped to 20psi at idle in gear , when I spoke with melling they told me the right oil pump
Was the 10355 I tried that one and my oil pressure was back up to 25psi hot idle . Of course when I installed the Johnson 2110 I lost 3 psi of oil pressure at hit idle . As the Johnson lifters a slightly narrower than the stock ls7 lifters .

02-27-2021, 06:10 PM	#1
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,100	l99 low oil pressure I didn't want to hi jack the "lowish oil pressure" post. So I've noticed my oil pressure sitting at 15psi at idle in gear when hot. Isn't the rule for every 1000 rpm your supposed to have 10psi of oil pressure? Or are my bearings just shot? __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

03-01-2021, 09:06 AM	#2
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,100	Well I figured out why my oil pressure is low. I was reading all the post on low oil pressure and found out that when I replaced the oil pump in my engine I put the wrong oil pump in. Like I said I was reading the post and seen the part numbers that everyone was posting and realized that I had put in the melling part number M365 which is a standard volume oil pump and I should have put the melling high pressure 10295 in because Ihave the l99. My only question is when I do the l99 afm delete, will the pressure go back up or should I pull the pump and replace it with the right one? __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817 Last edited by morepowerjoe; 03-01-2021 at 09:38 AM.

03-01-2021, 09:19 AM	#3
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Not sure on that . I think my builder put the 10295 in mine. I did the afm delete but kept my VVT. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

03-01-2021, 02:16 PM	#5
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	you're pressure isn't going to go up. If you aren't running the AFM you may not need the higher volume and will likely be fine. __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

03-04-2021, 06:31 AM	#9
JamesMyBoy Drives: 2014 2SS/RS Join Date: Jan 2014 Location: Eastern Nebraska Posts: 452	The "g" stands for gauge. At sea level, the weight of the air above you is 14.7 pounds... That is called absolute pressure. So, if your gauge is reading 15 psig, that equals 19.7 psia. Or, if you have a gauge laying on your workbench, it reads zero (gauge), but you and it have 14.7 psia on you. The higher elevation you are at, the lower the absolute pressure, since there's less air above you. Gauge pressure is all that really matters, unless you work in a vacuum :-) __________________

03-04-2021, 07:56 AM	#10
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,100	Thanks for the clarification, but what I really need to know is whether or not my oil pressure at 15 psi at a hot idle, in gear, at 500 rpm is ok? __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

03-04-2021, 08:04 AM	#11
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	There are ways to get a more accurate reading from the OBD port. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

03-04-2021, 08:34 AM	#14
Risingson05 Drives: 2015 zl1 m6 Join Date: Jan 2020 Location: Alaska Posts: 702	I installed to 10295 and my oil pressure dropped to 20psi at idle in gear , when I spoke with melling they told me the right oil pump Was the 10355 I tried that one and my oil pressure was back up to 25psi hot idle . Of course when I installed the Johnson 2110 I lost 3 psi of oil pressure at hit idle . As the Johnson lifters a slightly narrower than the stock ls7 lifters .