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Old 04-04-2012, 10:07 PM   #18
SixGracing

 
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Quote:
Originally Posted by Motion427 View Post
As far as I know,plenty of L99's converted to LS3 are still running the factory L99 oil pumps with no issues.Correct me if I'm wrong.
I have an L99 to LS3 converted motor and as far as I know am running the factory oil pump. No issues that I'm aware of..
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Old 04-05-2012, 02:04 AM   #19
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also just so you know all ls3 and l99 engines come with an active fuel managment(dod) oil pressure relief valve built into the oil pan ( yes even the ls3 engines have this, probly cheaper for gm just to build all the oil pans with this valve) , and if you leave it in you will always be limited to 50psi max, as the valve opens at 50 psi and blows the oil right back into the oil pan.

a 1/4" pipe plug fits perfect if you remove the valve, i have had mine out since i built my engine 12,000 miles ago and it works perfect with the l99 pump,, the factory oil filters have their own oil pressure relief built into them.
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Old 04-05-2012, 02:26 AM   #20
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I have never been a fan of aftermarket pumps. I've installed dozens because that is what people wanted, but I only recommend replacing them with stock if they are starting to go bad.
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Old 04-05-2012, 04:27 PM   #21
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Quote:
Originally Posted by Motion427 View Post
As far as I know,plenty of L99's converted to LS3 are still running the factory L99 oil pumps with no issues.Correct me if I'm wrong.
+1


Probably that's just marketing
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Old 11-27-2012, 12:22 AM   #22
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HMMM...IM NOT BUYING THE "ANY OIL PUMP WITH A RELIEF VALVE STICKS PART"

GM NEEDS TO OWN THEY HAVE A SHITTY PART...MANY OWNERS PUMPS ARE STICKING AT LESS THEN 5000 MILES...MINE MADE IT TO 50,000.....NUFF SAID
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Old 07-01-2013, 08:35 PM   #23
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Interesting that GM is now trying to charge me $1700 for a new oil pump, stating that it failed because my car is cammed. My car has 20k miles on it.
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Old 07-02-2013, 11:30 AM   #24
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Originally Posted by ztsmith86 View Post
If it adds any "good" to my original post I hold 2 engineering degrees from MIT and design water/wastewater systems all over the country. I have very practical and design knowledge of almost ever valve you could ever imagine ..... i.e. pressure relief valves. I'm not a engine expert by any means ... I really only state this info about me to give credit to my ability to assemble details
Things like Q and Re mean the same thing regardless of fluid type and application. Source: I have two engineering degrees from NJIT.

Thank you anyway for the information. There seems to be a lot of nitpicking on details like this here. Hopefully this will put some of it to rest.

PS-Fluid Mechanics was one of my favorite classes.
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Old 07-02-2013, 11:41 AM   #25
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Quote:
Originally Posted by Motion427 View Post
As far as I know,plenty of L99's converted to LS3 are still running the factory L99 oil pumps with no issues.Correct me if I'm wrong.
This is truth.

Great info on what part numbers do what for folks though. Thanks for helpin it out!

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Old 07-02-2013, 01:19 PM   #26
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I don't have a degree in fluid dynamics or statistics, but I'm not sure it's needed. Maybe in theory you should be correct, but in reality... the stock LS3 pumps stick open frequently. I have seen next to nothing as far as problems with the 10296. I'll let someone else more knowledgeable than I explain why.
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Old 07-02-2013, 02:09 PM   #27
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Originally Posted by thahemp View Post
I don't have a degree in fluid dynamics or statistics, but I'm not sure it's needed. Maybe in theory you should be correct, but in reality... the stock LS3 pumps stick open frequently. I have seen next to nothing as far as problems with the 10296. I'll let someone else more knowledgeable than I explain why.
Manufacturing tolerances
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Old 07-02-2013, 02:16 PM   #28
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Yeah. So the takeaway here is..

Use the Melling 10296 pump in place of the LS3. It doesn't fail like the stock one's aren't supposed to. And don't worry about a double roller chain. You don't need it. Use a good IWIS or C5R single chain and be done with it.
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Old 01-27-2014, 12:23 AM   #29
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Originally Posted by ztsmith86 View Post
Another thought to people looking to achieve better flows out of your oil pumps. You could just use a lighter weight oil, there would be some trade offs, but a lighter weight oil would give you better flow characteristics through any oil pump
I would have to mostly disagree with the applicability of this statement to internal combustion engines.

Because the oil functions to float mains, rods, and cam bearings but splash lubricate other parts, reducing viscosity could cause such a high fluid flow across the bearings that you could not practically maintain bearing oil pressure sufficient to float the crank under load.

This would be very bad.

Increase oil pressure with the same oil will increase bearing oil pressure and enable you to support more power (since it can float the rotating assembly under higher load situations).

A general racers rule of thumb has been 10 psi per 1000 rpm.

Your advice may be good for stock applications, but having more pressure and volume is often required as power levels go up in order to continue to float the bearings under higher load and rpms and because the oil is also serving to remove heat from the system and pass it through a cooler.

The questions are, what is the capacity of the stock system in terms of bearing load, heat removal, etc; what do these capacities equate to in HP (intermittent and steady) and rpm handling and where is the first weakest link. Sounds like the 50psi relief in the oil pan should be the first to go. The easy and cheap answer is simply, more volume and pressure.

I'd be curious to know if the crank is lubed prior to this relief. I would tend to doubt that the rotating assembly doesn't get at least 65 to 70 psi as rpm climb. It could be that the pump outflows this relief above some rpm.

How does the ls3 pump compare to an LSA?

Last edited by TannerJPowell; 01-27-2014 at 12:42 AM.
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Old 08-29-2015, 04:11 PM   #30
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i have a night fury cam on a ls3 what pump should i use
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