Yeah I agree.Quote:
Originally Posted by Beatdown Z
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Yeah I agree.Quote:
Originally Posted by Beatdown Z
I am going to replace the pump with cam swap, so is the Melling 10295 looking good? Stock volume, higher pressure.
The NNBS with DOD have a high volumn pump. I have it in my truck 5.3 and it idles around 60 goes way past 80 at WOT
Found this thread on Ls1tech by Scoggin Dickey about oil pumps. I just got a new 12612289 pump for my 01 5.3 would it work well since trucks have a deeper pan and have more oil in one area. All the NNBS trucks use these pumps. What your opinion?
"Alright guys, we finally got a straight answer back from the engineers at GM on what exactly the difference is in these pumps!
We'll start off with the 12586665 OE pump that started in the GenIII motors and carried over into some GenIV. This is not the high flow pump. This pump has a thinner gear set and smaller diameter compared to the high flow pump. Also, this pressure relief valve cracks open at 32 psi.
Next the 12571885 pump. This oil pump began its life in 2005 on the W-body V8’s and the LH6 5.3L in the truck applications of the Trailblazer/SSR's. This is the high flow oil pump, but no longer in production. This was in production until July, 2006. This pump is very similar to the 12586665 pump, but has a thicker gerotor with larger OD and a stiffer relief valve spring that cracks open at 52 psi. There are some differences also in the pump housing but nothing major. It was replaced by the pump listed below, 12612289.
Finally, the 12612289. As stated above, this pump is the current high flow pump in production. It is identical to the 12571885 pump, but the relief valve isn't as stiff. This relief valve cracks open at 42 psi.
We spoke with the GM engineering team and they informed us that these high flow pumps should not be run on the LS2/3 engines with the stock pan, because they were starving the pan of oil. At first it may not make sense, but what was happening is the high flow pumps were pumping the oil out of the pan faster than it could return. So after a short period of time, the big pump had emptied the oil pan of oil. We were told the big pumps generally go on aluminum block applications with phaser and/or AFM (Active Fuel Management AKA: displacement on demand) hardware. The small pump goes on all iron block applications as well as the aluminum block applications without a phaser and/or AFM hardware.