Oil Pressure Problem
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I'll agree with that on the other guy's car. My '02 T/A has 45K miles on it and it shows like 45psi on a warmed up engine and over 60psi whil revving. I bet that ticking is his rods knocking and not his lifters.
Any other guesses on my motor? I am seriously thinking about putting this stock replacement pump I have in to see what the pressure does. If it remains the same as the high volume pump then I know I have a more serious problem
Any other guesses on my motor? I am seriously thinking about putting this stock replacement pump I have in to see what the pressure does. If it remains the same as the high volume pump then I know I have a more serious problem
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UPDATE: I installed the stock replacement oil pump with no shim and used the oil I had in before. I got about 35psi at idle. I didn't run the motor too long because I haven't finished putting it back together. I thought the oil looked alittle thin even though I just changed it a couple weeks ago. So I went and got some regular 20W-50 oil from the local store and put it in. I got the same results. I don't want to admit it, but it sounds like I may have some bearing damage. The thing that gets me is that I don't know what may have caused it. I know it is a real pain in the butt to pull the oil pan off with the engine in the car, but I may have to do that to see what the bearings look like. I know the lower volume pump will make alittle difference on the pressure. BTW, I compared the HV pump HP spring to the stock pump and they are identical. Any ideas?
high VOLUME is just that, high volume. the pressure may be the same or slightly less, but the pump will more MORE oil. i'm guessing the melling HV pump is ported or something, but uses the same spring as stock. using a shim/stiffer spring will elevate the pressure, but there is no other way to increase the volume flow.
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Well, I have decided to pull my oil pan and check all the bearings. I just came to it that I rather spend the time and check it out for myself than assume and having to rebuild a motor in the next few months.
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high VOLUME is just that, high volume. the pressure may be the same or slightly less, but the pump will more MORE oil. i'm guessing the melling HV pump is ported or something, but uses the same spring as stock. using a shim/stiffer spring will elevate the pressure, but there is no other way to increase the volume flow.
You probably pumped the pan dry with that pump and pushed air in the bearings. You have damaged bearings. High volume means just that. The pump will flow more oil so it needs more oil available to feed it. You would have been better off with a shimmed LS6 pump. Never use a higher volume pump unless you have oil available to feed it.
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You probably pumped the pan dry with that pump and pushed air in the bearings. You have damaged bearings. High volume means just that. The pump will flow more oil so it needs more oil available to feed it. You would have been better off with a shimmed LS6 pump. Never use a higher volume pump unless you have oil available to feed it.
You probably pumped the pan dry with that pump and pushed air in the bearings. You have damaged bearings. High volume means just that. The pump will flow more oil so it needs more oil available to feed it. You would have been better off with a shimmed LS6 pump. Never use a higher volume pump unless you have oil available to feed it.
you would need to be very low on oil and be at high RPM
and still you need to imagine having all you oil sitting in your heads,
witch is hard to visualize because your lifters can`t possibly pump
that much oil to the top of you engine without it
draining back down to the pan.
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in order to "pump your pan dry"
you would need to be very low on oil and be at high RPM
and still you need to imagine having all you oil sitting in your heads,
witch is hard to visualize because your lifters can`t possibly pump
that much oil to the top of you engine without it
draining back down to the pan.
you would need to be very low on oil and be at high RPM
and still you need to imagine having all you oil sitting in your heads,
witch is hard to visualize because your lifters can`t possibly pump
that much oil to the top of you engine without it
draining back down to the pan.
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OK check these out. I pulled out all the rod bearings and two lower main bearing caps. The first one are the mains after that the rod bearings in order. It is alittle inconsistant on what has happened. What do you guys think?
Last edited by Gold Phoenix; Apr 21, 2008 at 10:18 PM.
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I talked to my local speed shop and the machine shop that did the work. It turns out that the bearings are Clevite 77 P-series bearing which are more used in street motors. They both said these bearing surfaces are softer and most likely didn't handle the 16psi of boost. They also agree that most of my oil pressure loss was in the #3 bearing since it showed the most wear. It would also explain the slow reduction of pressure over time.
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The pump and engine likely injested some bad stuff like crud and metal chips from the machining process. Was this block properly cleaned and scrubed after all the machining was done?
The best filter in the world will not help if the block was not cleaned properly after machining. Anyway, I use Fram filters too but I have heard from many they SUK.
The best filter in the world will not help if the block was not cleaned properly after machining. Anyway, I use Fram filters too but I have heard from many they SUK.
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OK, I know the routine for building/assembling an engine and with this one I took my time. I trusted the machine shop to get me the proper bearings for this motor and they screwed me. I am convinced that the bearings that was giving to me to be used were not intended for the amount of abuse that I put them through. The pump could have ate the some of the debris, but the filter caught them.
