oil pressure....
Originally Posted by jason5
thank you, i rebuilt my motor 2 years ago, and put a ported oil pump, my hot oil psi at idle is between 15 -20 crusing 25-35 and wide open throttle 40-55, with plenty of dragstrip runs, for 2 years haven't had one problem yet.
What some refuse to believe is that spinning a bearing has alot moer to do with the rod bolts stretching and the rods themselve flexing moreso than it does an oil psi problem.
If low oil psi was a problem, then on the motors I have seen with a spun bearing the mains and other high stress areas would show wear, but hardly any do.
With most spun bearing motors, you will get a spun or crushed bearing, and the bearings after that will show wear from the fact that oil wasn't getting to them as well as it should before you shut it down. However with most as I said again... all the rod bearings aside from the one that was spun or crushed will show minimal wear... hardly any. Now tell me.. if the car was having an oil problem.. wouldn't some of the othr bearings aside from the one that spun show a bit of wear too?
In most cases no... because it has nothing to do with a lack of oil problem as much as it does rod bolt / rod flex distorting the clearances on that particular journal.
i spun 2 bearings, polished 2 more ^^^^....if it hadnt been 2 months ago i take some pics of the actual bearings and place them up.....the little middle picture is of us putting the motor back in at the shot....why would bolts flex or stretch? heat...why would heat be a problem? lack of lubrication and friction
also i see alot of people posting about having there "built" motors running low psi etc etc....now do most of these people have a stock ls1 pump? or did they go with a ls2/ls6 or ported pump? if so then psi doesnt matter as much because of the volume being pushed....if not, and your running a crappy stock ls1 pump in the new "built" motor then your advice speaks for itself.....in my stock motor i put in a ls2 chain and a ls6 pump, just because of such issues.
also i see alot of people posting about having there "built" motors running low psi etc etc....now do most of these people have a stock ls1 pump? or did they go with a ls2/ls6 or ported pump? if so then psi doesnt matter as much because of the volume being pushed....if not, and your running a crappy stock ls1 pump in the new "built" motor then your advice speaks for itself.....in my stock motor i put in a ls2 chain and a ls6 pump, just because of such issues.
Originally Posted by jason5
thank you, i rebuilt my motor 2 years ago, and put a ported oil pump, my hot oil psi at idle is between 15 -20 crusing 25-35 and wide open throttle 40-55, with plenty of dragstrip runs, for 2 years haven't had one problem yet.
Originally Posted by staringback05
i spun 2 bearings, polished 2 more ^^^^....if it hadnt been 2 months ago i take some pics of the actual bearings and place them up.....the little middle picture is of us putting the motor back in at the shot....why would bolts flex or stretch? heat...why would heat be a problem? lack of lubrication and friction
also i see alot of people posting about having there "built" motors running low psi etc etc....now do most of these people have a stock ls1 pump? or did they go with a ls2/ls6 or ported pump? if so then psi doesnt matter as much because of the volume being pushed....if not, and your running a crappy stock ls1 pump in the new "built" motor then your advice speaks for itself.....in my stock motor i put in a ls2 chain and a ls6 pump, just because of such issues.
also i see alot of people posting about having there "built" motors running low psi etc etc....now do most of these people have a stock ls1 pump? or did they go with a ls2/ls6 or ported pump? if so then psi doesnt matter as much because of the volume being pushed....if not, and your running a crappy stock ls1 pump in the new "built" motor then your advice speaks for itself.....in my stock motor i put in a ls2 chain and a ls6 pump, just because of such issues.
Motor has a tsp ported ls6 oil pump.
You think rod bolts stretch mainly because of heat?
^ didnt say that....heat expands everything to an extent...its physics and like i said the arguement was that guys dont understand the difference in volume, pressure, and how lack of one or the other will effect internals.....ie ls6 or ported...will run higher volume less pressure....stock ls1 will run less volume but higher pressure....you could get away with lower psi in a ported pump, not in a ls1 stock pump
Banned
Joined: Apr 2006
Posts: 1,875
Likes: 1
From: Naperville, IL
I have a basicly stock LS1 with bolt ons (for now). I drive it semi-hard to hard a few times a week. Over the past 3 years, the car has gone from 68k to 90k miles and driven all year around. 3 years ago the car had right around 39-40 psi hot idle. Today, in stop and go traffic in 95 degree weather with high humidity (black car) I had about 30 psi of hot idle pressure. I run 0w30 GC and a K&N oil filter. I'm not concerned in the least. It was very hot, I feel the engine has loosened up a bit in the last 30k, pressure still follows RPM, and it never gets spun over 6100.
Ok well I dont know what happened but it seems to be settling right around 38 psi, but didnt start doin this till after I cleaned my k&n air filter dont ask, I dont know why this would be soo, but the car runs great now.
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Brett Foote
TECH Apprentice
Joined: Jul 2005
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Originally Posted by ineedashortblock
K, Lets get a good discussion going.
What about an Ls1 makes it so different that it "requires" all that oil PSI at idle and WOT?
What your basically saying is my forged motor, is going to die because of the under 30 lbs at idle, and right under 40 at cruising LOL.
I highly doubt your spun bearing had anything to do with your oil pressure, if so then every car I've seen with less than par oil pressure would have a spun bearing.
What about an Ls1 makes it so different that it "requires" all that oil PSI at idle and WOT?
What your basically saying is my forged motor, is going to die because of the under 30 lbs at idle, and right under 40 at cruising LOL.
I highly doubt your spun bearing had anything to do with your oil pressure, if so then every car I've seen with less than par oil pressure would have a spun bearing.
Launching!
Joined: Feb 2006
Posts: 264
Likes: 0
From: Cabot Arkansas
Well I'm not understanding why these motors need "high" pressure. I have a ported katech pump my oil pressure generally runs high but if it didnt I wouldnt be concerned unless it dropped down suddenly and was running in a different range. I have a 1994 caprice 9c1 with an LT-1 and at idle it runs at like 7-10 psi and thats within operating range. I agree that its about volume not pressure, but at the same time if its good enough for an lt1 at 7psi why not an ls1 at 20?
another oil pressure thread!! i have .003 main and with stock pump i had 25-55psi. never had a problem. hp/hv pump will not suck your pan dry. i use the melling now and see over 70psi wot. if you use the stock pump shim it.
