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Oil pressure drops at high rpm

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Old 12-11-2011, 06:47 PM   #61
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I havent taken the bottom end apart, cam bearings dont look that bad, cant really see them in there either. Yeah, I was pretty stunned when I saw it. It ran great except for the low oil pressure at high rpm, like 6800. Good thing I pulled the motor.
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Old 12-11-2011, 08:21 PM   #62
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How were mains?
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Old 12-11-2011, 08:25 PM   #63
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I havent taken the bottom end apart, the motor is actually still sitting in the kmember. once I get a stand, I will pull the bottom apart. This is going to be a winter long project as it wasnt expected.
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Old 12-11-2011, 09:21 PM   #64
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very interesting, wasn't expecting you to find that.
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Old 12-12-2011, 07:57 AM   #65
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And I'm still not convinced that is the issue with the high rpm oil pressure drop.
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Old 05-10-2012, 11:49 PM   #66
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bumping an old thread, but sounds like its doing exactly what mine is doing. sometimes when going WOT it goes from ~60 psi at 4500 rpm to about 40 at 6000, doesnt always do this when going WOT. im really confused on what to do, also when driving around it will occasionally drop when giving it some gas, then return as soon as i let off. so am i fu*ked?
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Old 05-11-2012, 05:53 AM   #67
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Is it low on oil?
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Old 05-11-2012, 10:14 AM   #68
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nope, its a little over the x's
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Old 05-11-2012, 10:20 AM   #69
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Thrust bearing....
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Old 05-11-2012, 10:21 AM   #70
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guess ill check that today, sounds like im f*&ked
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Old 05-11-2012, 03:18 PM   #71
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drained the oil and didnt see any metal flakes anywhere in it, and looks soild black with just just a little hint of marbling. also noticed that my oil filter wasnt tight all the way, i was able to take it off with just my oilly hand. is it possible that the oil filter being loose was the problem all along?
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Old 05-11-2012, 03:47 PM   #72
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Quote:
Originally Posted by 1999transamls1 View Post
drained the oil and didnt see any metal flakes anywhere in it, and looks soild black with just just a little hint of marbling. also noticed that my oil filter wasnt tight all the way, i was able to take it off with just my oilly hand. is it possible that the oil filter being loose was the problem all along?
Doubt it was the oil filter unless it was leaking like crazy to cause low oil pressure ... was there oil all over the place by the oil filter mount? If not, then it's not the oil filter.
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Old 05-11-2012, 05:10 PM   #73
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just replaced it and still does it, at 5k rpm its at 65 psi, 6k rpm its at like 40 wtf....

its not low on oil, so i have no idea what to do, tear it apart? put manual gauge on it?
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Old 05-11-2012, 05:16 PM   #74
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I didn't read the 4 pages, BUT I do know that cheap non-GM oil PSI sensors act a little off.. I once broke my oil psi sensor when putting my intake manifold on, and used a cheap Autozone brand sensor, and my pressure was immediately off. I never had an issue with dropping oil pressure before, but after this cheap sensor, my gauge would drop at WOT. I replaced it with the same brand sensor, thinking it was bad, and the problem is still there. I've been TOLD that anything non GM reads funky. I have not since replaced it with a GM sensor, but i find it funny that I never had any pressure drops until that cheap sensor.
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Old 05-11-2012, 06:20 PM   #75
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Mines a gm opsu, i just replaced it.but I didn't torque it down, I just snugged it down.

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Old 05-11-2012, 07:49 PM   #76
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The other possibility is a cam bearing walking.
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Old 05-11-2012, 07:57 PM   #77
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Would any of those make noise? My car doesn't make any really besides an exhaust leak
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Old 05-11-2012, 11:00 PM   #78
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Measure crank endplay. Takes 5 minutes or less.
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Old 05-12-2012, 10:39 AM   #79
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i dont have a feeler gauge, but when i just checked the endplay, you couldnt even hardly see it move at all, you could just barely see it moving a tad. gonna have a manual gauge put on monday because i just noticed that it jumps around alot all of the sudden also. kinda leaning towards gauge/opsu/opsu harness
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Old 05-12-2012, 10:45 AM   #80
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any way you can install a mechanical guage on it before doing anything else? that would tell you the whole truth and nothing but the truth.

my 99 car never has made great oil pressure (according to the factory guage), but it has never had a problem building/holding it. it has pretty much been the same over the past 7 years and 80 thousand miles i've put on it. it hasn't had a hard life persay, but i can def attest to it not being an easy one.
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98, cobra, drops, gauge, high, loss, low, ls1, ls1tech, mycarlosesoilpressurewhenifloorit, oil, pressure, rpm, rpms, tech

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