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Old 01-03-2010, 07:06 PM
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Default Oil Pressure Help

When I start the car in the morning it has perfect oil pressure, then once it warms up it drops down to the lower side of the gauge. The sender behind the manifold has been changed, and when I changed the oil tonight I found a slight amount of metal shavings on the drain plug magnet. I cut the filter open and found no shavings at all. I've been told I have a bearing on the way out anybody have any input?
Old 01-04-2010, 12:30 AM
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Thats hard to say, thats not really enough info. car, miles, any noise, low on oil, exc.
Old 01-04-2010, 06:39 PM
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Originally Posted by NAVY99B4C
Thats hard to say, thats not really enough info. car, miles, any noise, low on oil, exc.
2001 z28 66k miles, HKE built 346 10k miles Head/Cam, no abnormal noises and runs and drives perfectly normal, not low on oil. Im stumped, when I turn the car off the gauge stays @ about 25 psi though. Could it be the gauge itself?
Old 01-04-2010, 06:53 PM
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what is normal oil pressure to you? you say it drops to the low side, but when you start it that the pressure is perfect.

in numbers or on the gauge what do these terms mean?

thickness of oil and oil temp is going to have an affect on the pressure. also the type of pump. stock ls1, stock ls6, ported shimmed ls6, mellings? also if your engine was built loose or tight on clearences.

HKE does good builds, i cant see it being an internal problem.

since it doesnt make noise or anything of that sort. i would say it is safe to assume that the engine as a whole and all its part are getting some/to sufficent oil to keep from failing.
Old 01-04-2010, 09:54 PM
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Originally Posted by NAVY99B4C
what is normal oil pressure to you? you say it drops to the low side, but when you start it that the pressure is perfect.

in numbers or on the gauge what do these terms mean?

thickness of oil and oil temp is going to have an affect on the pressure. also the type of pump. stock ls1, stock ls6, ported shimmed ls6, mellings? also if your engine was built loose or tight on clearences.

HKE does good builds, i cant see it being an internal problem.

since it doesnt make noise or anything of that sort. i would say it is safe to assume that the engine as a whole and all its part are getting some/to sufficent oil to keep from failing.
40 psi is supposed to be normal, and that's where the gauge sits when it's cold. Once it warms up it drops to 20, 25, even 30 sometimes. I run 10w30 oil, and the motor was built for nitrous(a large shot @ that) I have no clue as to what oil pump is in the motor.
Old 01-04-2010, 09:56 PM
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FYI, when you change the sending units it can effect how the gauge reads. My advice is to check it with a mechanical pressure gauge.
Old 01-04-2010, 10:04 PM
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Originally Posted by 01ssreda4
FYI, when you change the sending units it can effect how the gauge reads. My advice is to check it with a mechanical pressure gauge.
i agree^^

i dont think its anything serious. but electric gauges suck. put a real gauge on it and youll find out exactly what its doing.
Old 01-05-2010, 04:16 PM
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this is ironic as hell... same thing happened to me this morning on my way to school. pressure was fine, and then i noticed when i was at a stoplight that my gauge was reading about 25 psi. its normally at 40 psi. but when i start to drive the pressure goes back up to 40. its never done that before.i still have 5w-30 in it from summer, but plan to change to 10-20 while it is cold out. maybe all i need is a oil change.
Old 01-05-2010, 04:53 PM
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Originally Posted by linebacker50
this is ironic as hell... same thing happened to me this morning on my way to school. pressure was fine, and then i noticed when i was at a stoplight that my gauge was reading about 25 psi. its normally at 40 psi. but when i start to drive the pressure goes back up to 40. its never done that before.i still have 5w-30 in it from summer, but plan to change to 10-20 while it is cold out. maybe all i need is a oil change.
what year LS1? if its a 98-2000 it is possible your pump relief valve may be getting ready to crap out. or your low on oil
Old 01-05-2010, 04:55 PM
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to the OP: i would say check it with a mechanical gauge as well, maybe the sending unit is going bad? you can also try thicker oil
Old 01-05-2010, 07:29 PM
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Originally Posted by 01ssreda4
FYI, when you change the sending units it can effect how the gauge reads. My advice is to check it with a mechanical pressure gauge.
Where would I tie into on the block for the mechanical gauge?
Old 01-05-2010, 07:32 PM
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Originally Posted by ae13291
what year LS1? if its a 98-2000 it is possible your pump relief valve may be getting ready to crap out. or your low on oil
Its an 01' and i just changed the oil it's got the perfect amount and its got 10w30 in it already.
Old 01-05-2010, 08:06 PM
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Originally Posted by blk90coupe
Where would I tie into on the block for the mechanical gauge?
there is an oil pressure port directly above the filter you can drill and tap then plug when you are through using it. Just search around, the info is here.
Old 01-05-2010, 08:34 PM
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Originally Posted by 01ssreda4
there is an oil pressure port directly above the filter you can drill and tap then plug when you are through using it. Just search around, the info is here.
On the bottom side of the motor?
Old 01-05-2010, 08:51 PM
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Originally Posted by blk90coupe
On the bottom side of the motor?
yes on the bottom, its part of the oil pan, look at the filter from below the car, and its right above the filter its a adaptor looking thing held on by 2 bolts.
Old 01-07-2010, 06:18 PM
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I replaced the electric gauges's sender today, the old one cracked and caused a massive oil leak. It helped the problem somewhat, but it's still not right. The gauge acts funny like it gets stuck @ times and starts twitching, and when I turn the car off the gauge stays in its position it was in when the car is on. It goes down when I go to start the car the next time. I ordered a mechanical gauge from jeg's and it should be here tomorrow and hopefully that fixes the problem.
Old 01-07-2010, 09:44 PM
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Originally Posted by blk90coupe
I replaced the electric gauges's sender today, the old one cracked and caused a massive oil leak. It helped the problem somewhat, but it's still not right. The gauge acts funny like it gets stuck @ times and starts twitching, and when I turn the car off the gauge stays in its position it was in when the car is on. It goes down when I go to start the car the next time. I ordered a mechanical gauge from jeg's and it should be here tomorrow and hopefully that fixes the problem.

That is normal.....




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