Oil pressure not rising with RPM
08-15-2011, 10:15 PM
#21
Do you know the engine clearances? I'm guessing you have loose bearing clearances which obviously will effect your oil pressure. Try a 20w-50 with a good filter like a k&n and see how that works. Otherwise an oil cooler will help keep oil temps down and help maintain higher pressure.
08-15-2011, 10:29 PM
#22
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UPDATE:
I got the timing cover off today and didn't see anything obvious that was "wrong". The oil pump was secured well. The o-ring was perfect. The oil gallery plug was fine. I took the Melling oil pump apart and didn't see anything odd, but this is the first pump I've disassembled. The only issue I see is the timing chain is pretty lax. Here is a video of the chain and you guys can tell me what you think of the slack in the chain.
Here is the video link:
http://www.flickr.com/photos/48008900@N03/6048073964/
I got the timing cover off today and didn't see anything obvious that was "wrong". The oil pump was secured well. The o-ring was perfect. The oil gallery plug was fine. I took the Melling oil pump apart and didn't see anything odd, but this is the first pump I've disassembled. The only issue I see is the timing chain is pretty lax. Here is a video of the chain and you guys can tell me what you think of the slack in the chain.
Here is the video link:
http://www.flickr.com/photos/48008900@N03/6048073964/
08-15-2011, 10:31 PM
#23
08-15-2011, 10:48 PM
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Do you know the engine clearances? I'm guessing you have loose bearing clearances which obviously will effect your oil pressure. Try a 20w-50 with a good filter like a k&n and see how that works. Otherwise an oil cooler will help keep oil temps down and help maintain higher pressure.
While the chain is slightly looser then I would think is optimal, I don't say its a cause for panic. The motor built? Perhaps if they line bored for the crank that moves the crank upward some and creates more slack in the timing?? Also, the double row chains are know for breaking and this may be why...too much slack gets the chain whipping around during operation. A timing chain dampner (LS2 style) would work well here although I'm not sure if they are wide enough to support a double roller. All of that has no effect on your your oil pressure though. I still say replace the pump since everything else has checked out.....
Also, I have a new LS4 oil pump on the way. Hopefully it fixes my issue.
08-15-2011, 11:01 PM
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The holes are drilled, you got lucky and got a block with them (some 2002s got them). Have you checked to see if its an LS6 block? But, I can see them in your video. They (2) are right above the crank sprocket. No reason not to run a damper.
08-15-2011, 11:09 PM
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I've noticed them, just didn't know that the LS2 damper would fit. I really haven't checked the part number because it's never really mattered to me what block it was. LOL I have my stock cam and crank sprockets along with a LS2 chain in box full of other parts. Should I remove this double roller and put that factory stuff back on and order a damper?
08-15-2011, 11:20 PM
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Damper may work will the double roller I dunno. I simply don't like the double rollers because when chains break its almost always them. That just doesn't sit well with me. I know your setup is pretty wicked so I would consult someone who is familiar for their TC recommendation. The rate that your engine is going to accel through the rpm band is gnna be punishing for any chain to deal with.
08-15-2011, 11:23 PM
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Come to think about it there is a guy/company that is selling the modified ones to work with the LS6 blocks. I should pick up one myself. I forget where the thread is located though as its been awhile.
08-15-2011, 11:30 PM
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I know for a fact there were 2 different hole dimensions (distance from centers) so there is no way that can be right. The LS6 did have a damper available but it is made from unobtainium now.
08-15-2011, 11:46 PM
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I never even noticed the holes when assembling my engine 
I feel like a retard 
I went back and looked at some assembly pictures and sure enough they are there.
I feel like a retard I went back and looked at some assembly pictures and sure enough they are there.
08-17-2011, 01:07 AM
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Holy **** that is a loose chain! I got a .005 under double roller from the machine shop i used and it has absolutley no slack in either direction.
As far as your oil pressure problem. I was just going through the same problem. My problem wound up being that the front cover of the pump was loose allowing the oil to bleed off easier once hot.
I know you said it was a double roller so did you use any rtv on the spacer for the pump? That is another place to loose pressure.
What size lines are you running to the turbos? any restrictors?
As far as your oil pressure problem. I was just going through the same problem. My problem wound up being that the front cover of the pump was loose allowing the oil to bleed off easier once hot.
I know you said it was a double roller so did you use any rtv on the spacer for the pump? That is another place to loose pressure.
What size lines are you running to the turbos? any restrictors?
08-17-2011, 07:42 AM
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Holy **** that is a loose chain! I got a .005 under double roller from the machine shop i used and it has absolutley no slack in either direction.
As far as your oil pressure problem. I was just going through the same problem. My problem wound up being that the front cover of the pump was loose allowing the oil to bleed off easier once hot.
I know you said it was a double roller so did you use any rtv on the spacer for the pump? That is another place to loose pressure.
What size lines are you running to the turbos? any restrictors?
As far as your oil pressure problem. I was just going through the same problem. My problem wound up being that the front cover of the pump was loose allowing the oil to bleed off easier once hot.
I know you said it was a double roller so did you use any rtv on the spacer for the pump? That is another place to loose pressure.
What size lines are you running to the turbos? any restrictors?
I'm running -4 lines to the turbos. No restrictor should be used on journal bearing stuff.
08-19-2011, 11:37 AM
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I took a few pics of the oil plug in the front of the block and wanted opinions. It has 4 makes on it, but I'm not sure if they are there from the installation by the machine shop.
