Cons of a shimmed oil pump spring?
05-28-2004, 06:39 PM
#1
Cons of a shimmed oil pump spring? What are the disadvantages of shimming the oil pump spring for increased oil pressure?
Also, at what stage should one have to shim their pump for better oil pressure? I don't like the low at idle oil pressure I have always had with my motor. It has a stock, deburred, ported and shimmed oil pump but the PSI at idle is too low for my liking.
Any ideas on what the increments of shim sizes and effective increase in PSI output?
Also, at what stage should one have to shim their pump for better oil pressure? I don't like the low at idle oil pressure I have always had with my motor. It has a stock, deburred, ported and shimmed oil pump but the PSI at idle is too low for my liking.
Any ideas on what the increments of shim sizes and effective increase in PSI output?
Last edited by CANNIBAL; 05-28-2004 at 07:00 PM.
05-29-2004, 10:39 AM
#3
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How far is it shimmed? The pressure your motor sees has a lot of factors in it. Crank oil hole shamfers, bearing clearances(not nessacarly a bad clearance) type of oil, heat of oil, pump pressure....And not to mention your gauge in your dash is not completly accurate. Have you had an extrernal gauge on it? Does the pressure drop extremly low at idle or when it is run hard? If not then I would say you have nothing to worry about.
Nate
Nate
05-29-2004, 10:56 AM
#4
Originally Posted by Nasty N8
How far is it shimmed?
Originally Posted by Nasty N8
The pressure your motor sees has a lot of factors in it. Crank oil hole shamfers, bearing clearances(not nessacarly a bad clearance) type of oil, heat of oil, pump pressure....And not to mention your gauge in your dash is not completly accurate. Have you had an extrernal gauge on it? Does the pressure drop extremly low at idle or when it is run hard? If not then I would say you have nothing to worry about.
Nate
Nate
It only drops low at idle after the oil has reached operating temperature, at other RPMs and loads it's just fine. I have not ran it hard in months, it rarely sees over 3500 RPMs on a monthly basis.
Last edited by CANNIBAL; 05-29-2004 at 11:06 AM.
05-31-2004, 09:38 AM
#5
I ordered a new LS6 oil pump, shimmed, deburred and ported. Also, a new oil pump o-ring will be utilized.
This should take care of it. I'll post back with my results.
I'm also ordering a triple pillar pod for fuel pressure, OIL PRESSURE and water temp. The stock gauges are **** poor.
This should take care of it. I'll post back with my results.
I'm also ordering a triple pillar pod for fuel pressure, OIL PRESSURE and water temp. The stock gauges are **** poor.
Last edited by CANNIBAL; 05-31-2004 at 09:48 AM.
05-31-2004, 11:32 AM
#7
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Jason is right, Levi, higher pressure is not as good as it sounds.
I also hear that increased oil pressure can blow out the rear oil galley plug in some cases. This may be the problem with yours currently. There is enough room for the plug to pop out and bypass oil from the bottom end back into the pan. It is in place with an o-ring only, no clamp. You may not notice much of a change in pressure since this is after the sensor but the lower end will be a ticking time bomb.
That said, it is very hard to verify this. The rear engine cover must be removed and I can only imagine how fun this would be in-car.
Let us know how things go, thanks.
I also hear that increased oil pressure can blow out the rear oil galley plug in some cases. This may be the problem with yours currently. There is enough room for the plug to pop out and bypass oil from the bottom end back into the pan. It is in place with an o-ring only, no clamp. You may not notice much of a change in pressure since this is after the sensor but the lower end will be a ticking time bomb.
That said, it is very hard to verify this. The rear engine cover must be removed and I can only imagine how fun this would be in-car.
Let us know how things go, thanks.
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05-31-2004, 11:39 AM
#8
Originally Posted by ktmrider
Jason is right, Levi, higher pressure is not as good as it sounds.
I also hear that increased oil pressure can blow out the rear oil galley plug in some cases. This may be the problem with yours currently. There is enough room for the plug to pop out and bypass oil from the bottom end back into the pan. It is in place with an o-ring only, no clamp. You may not notice much of a change in pressure since this is after the sensor but the lower end will be a ticking time bomb.
That said, it is very hard to verify this. The rear engine cover must be removed and I can only imagine how fun this would be in-car.
Let us know how things go, thanks.
I also hear that increased oil pressure can blow out the rear oil galley plug in some cases. This may be the problem with yours currently. There is enough room for the plug to pop out and bypass oil from the bottom end back into the pan. It is in place with an o-ring only, no clamp. You may not notice much of a change in pressure since this is after the sensor but the lower end will be a ticking time bomb.
That said, it is very hard to verify this. The rear engine cover must be removed and I can only imagine how fun this would be in-car.
Let us know how things go, thanks.
I understand high oil pressure can be a very bad thing. My motor has looser tolerances so my oil pressure, holding the pump the same, will naturally be lower. MTI shims the oil pump spring to compensate for the looser tolerances of the motor to increase the oil pressure. I'm getting a new pump, shimmed. I just feel that this pump wore out, holding all else equal as I'm using the same oil, filter, etc.
I don't like my oil pressure at idle (at operating temperature) dropping below the first 1/4 mark on the stock oil pressure gauge. However, I still have no verified the pressure output via an external gauge. I'd rather put in a new motor and prevent toasting a very expensive motor.
05-31-2004, 11:59 AM
#9
Staging Lane
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Levi. you can bring it by the shop and we'll hooup a gauge to it. for peace of mind. i will help you anyway i can. if you wanna come use a rack on a saturday to do the swap ill be there to let you in etc.. I hope nothing is wrong..
goodluck man,
Lemme know if you need anything
goodluck man,
Lemme know if you need anything
05-31-2004, 12:16 PM
#10
Originally Posted by Jason98Zee
Levi. you can bring it by the shop and we'll hooup a gauge to it. for peace of mind. i will help you anyway i can. if you wanna come use a rack on a saturday to do the swap ill be there to let you in etc.. I hope nothing is wrong..
goodluck man,
Lemme know if you need anything
goodluck man,
Lemme know if you need anything
Where is your shop located man? I may drive it over there on Saturday and do that, check the pressure first.
05-31-2004, 12:45 PM
#12
Originally Posted by Jason98Zee
I work at Quantrell Cadillac, Volvo on New Circle Right across from Palumbo. Dr..
I appreciate it.
05-31-2004, 01:27 PM
#13
why would MTI run looser tolerances, What do they run looser tolerances on. too much oil pressure is bad yall established that. You typically want about 10psi per 1000rpm on a typical engine
05-31-2004, 02:05 PM
#14
Originally Posted by SlIm95
why would MTI run looser tolerances, What do they run looser tolerances on. too much oil pressure is bad yall established that. You typically want about 10psi per 1000rpm on a typical engine
06-01-2004, 11:27 AM
#15
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Levi, if you all are gonna come lemme know before hand, we can check the pressure anytime. just gimme a call, but i will be there on Saturday prolly put in some plugs n stuff..
Lemme know Via, email or call me on my Cell i Emailed it to you..
Lemme know Via, email or call me on my Cell i Emailed it to you..
