pump. 
oil pump
Thread Starter
TECH Enthusiast
Joined: Jul 2007
Posts: 535
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From: SC
oil pump was looking at SLP's oil pump for my 98 but i have stock h/c would it hurt to do the switch. i heard LS6 pump was the way to go but what are your thoughts? it just ticked to 83k on it now... just looking for a little insurance
i actually just ordered the melling 295 about 3 hours ago, its a cheaper version of the 296, less volume, but still great quality because i dont want ot have to pull this sucker out again. plus cheaper than the ls6
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LS1Tech Sponsor
Joined: Oct 2002
Posts: 603
Likes: 1
From: Decatur, IN
Oil pump The LS1 and the LS6 pumps are the EXACT same pump. No difference in volume at all.
The Melling 295 pump also has the same volume displacement as the factory LS1/LS6 pumps although they have a slightly different pressure control valve and pressure spring.
If you have good oil pressure at hot engine idle (hot oil and hot coolant) then you don't need a bigger pump so the stock pump or a Melling 295 should be fine.
The Melling 10296 and the high volume GM pump that we sell (we sell and use the Melling 10296 as well) are recommended if you have larger than stock clearances or something else causing you to need increased oil pump volume in order to achieve good oil pressure (different bearing design, etc.).
The Melling 295 pump also has the same volume displacement as the factory LS1/LS6 pumps although they have a slightly different pressure control valve and pressure spring.
If you have good oil pressure at hot engine idle (hot oil and hot coolant) then you don't need a bigger pump so the stock pump or a Melling 295 should be fine.
The Melling 10296 and the high volume GM pump that we sell (we sell and use the Melling 10296 as well) are recommended if you have larger than stock clearances or something else causing you to need increased oil pump volume in order to achieve good oil pressure (different bearing design, etc.).
LS1Tech Sponsor
Joined: Oct 2002
Posts: 603
Likes: 1
From: Decatur, IN
LS2 oil pump The LS2 is also the same exact volume as the LS1 and LS6 oil pumps.
All the Gen III V8 engine use the same pump except for the displacement on demand (DOD) engines that use a higher volume pump. The Gen IV engines also use the same displacement pump except for the the DOD (now called Active Fuel Management or AFM) engines and hybrid truck engines. The camshaft phaser engines might also use a higher volume pump - I don't remember right now.
So basically LS1, LS2, LS6, LQ4, LQ9, etc all have the same pump.
All the Gen III V8 engine use the same pump except for the displacement on demand (DOD) engines that use a higher volume pump. The Gen IV engines also use the same displacement pump except for the the DOD (now called Active Fuel Management or AFM) engines and hybrid truck engines. The camshaft phaser engines might also use a higher volume pump - I don't remember right now.
So basically LS1, LS2, LS6, LQ4, LQ9, etc all have the same pump.
Teching In
Joined: Feb 2007
Posts: 31
Likes: 0
The LS1 and the LS6 pumps are the EXACT same pump. No difference in volume at all.
The Melling 295 pump also has the same volume displacement as the factory LS1/LS6 pumps although they have a slightly different pressure control valve and pressure spring.
If you have good oil pressure at hot engine idle (hot oil and hot coolant) then you don't need a bigger pump so the stock pump or a Melling 295 should be fine.
The Melling 10296 and the high volume GM pump that we sell (we sell and use the Melling 10296 as well) are recommended if you have larger than stock clearances or something else causing you to need increased oil pump volume in order to achieve good oil pressure (different bearing design, etc.).
The Melling 295 pump also has the same volume displacement as the factory LS1/LS6 pumps although they have a slightly different pressure control valve and pressure spring.
If you have good oil pressure at hot engine idle (hot oil and hot coolant) then you don't need a bigger pump so the stock pump or a Melling 295 should be fine.
The Melling 10296 and the high volume GM pump that we sell (we sell and use the Melling 10296 as well) are recommended if you have larger than stock clearances or something else causing you to need increased oil pump volume in order to achieve good oil pressure (different bearing design, etc.).
I have an oild pressure problem as seen in this pic
would the the Melling 10296 help my oil pressure problem?
LS1Tech Sponsor
Joined: Oct 2002
Posts: 603
Likes: 1
From: Decatur, IN
oil pressure You appear to have a little over 20 psi at roughly 1000 rpm. I would not call that an oil pressure problem. That is acceptable oil pressure. You don't need 40 psi at idle or near idle (if you are used to seeing more traditional SBC and BBC oil pressure readings).
What was your oil temperature at that pressure?
What was your oil temperature at that pressure?
Teching In
Joined: Feb 2007
Posts: 31
Likes: 0
You appear to have a little over 20 psi at roughly 1000 rpm. I would not call that an oil pressure problem. That is acceptable oil pressure. You don't need 40 psi at idle or near idle (if you are used to seeing more traditional SBC and BBC oil pressure readings).
What was your oil temperature at that pressure?
What was your oil temperature at that pressure?
LS1Tech Sponsor
Joined: Oct 2002
Posts: 603
Likes: 1
From: Decatur, IN
Oil temperature Not without a temperature gauge in your oil system or a temperature probe down the dipstick tube (we have a thermocouple probe oil dipstick we use for a quick oil temperature measurement sometimes on cars that don't have oil temperature sensors).
If you had been running the car for a long time at partial throttle, light load conditions, then your oil temperature is probably fairly close to your coolant temperature (around 180 to 190 on the ECT gauge). If you were runnng WOT or high load recently then your oil temperature would probably be higher than your coolant temperature, especially if you don't have an oil cooler.
If your oil temperature is in the 180 to 200 deg F range and you have 20 psi at 800 to 1000 rpm, I would not consider that to be an oil pressure problem.
If you had been running the car for a long time at partial throttle, light load conditions, then your oil temperature is probably fairly close to your coolant temperature (around 180 to 190 on the ECT gauge). If you were runnng WOT or high load recently then your oil temperature would probably be higher than your coolant temperature, especially if you don't have an oil cooler.
If your oil temperature is in the 180 to 200 deg F range and you have 20 psi at 800 to 1000 rpm, I would not consider that to be an oil pressure problem.
Teching In
Joined: Feb 2007
Posts: 31
Likes: 0
Not without a temperature gauge in your oil system or a temperature probe down the dipstick tube (we have a thermocouple probe oil dipstick we use for a quick oil temperature measurement sometimes on cars that don't have oil temperature sensors).
If you had been running the car for a long time at partial throttle, light load conditions, then your oil temperature is probably fairly close to your coolant temperature (around 180 to 190 on the ECT gauge). If you were runnng WOT or high load recently then your oil temperature would probably be higher than your coolant temperature, especially if you don't have an oil cooler.
If your oil temperature is in the 180 to 200 deg F range and you have 20 psi at 800 to 1000 rpm, I would not consider that to be an oil pressure problem.
If you had been running the car for a long time at partial throttle, light load conditions, then your oil temperature is probably fairly close to your coolant temperature (around 180 to 190 on the ECT gauge). If you were runnng WOT or high load recently then your oil temperature would probably be higher than your coolant temperature, especially if you don't have an oil cooler.
If your oil temperature is in the 180 to 200 deg F range and you have 20 psi at 800 to 1000 rpm, I would not consider that to be an oil pressure problem.
