SSdreamz

iTrader: (3)

Please help. this post is alittle premature, but i thought id start it anyways. last night driveing home i noticed my oil pressure to drop to 40psi while driving and alittle below 40psi at an idle. now usually that wouldnt even make me think twice but, i have a ported oil pump i put in less than 3000 miles ago and ever since then the oil pressure has been around 70 at start up, 60 under load and 55ish at an idle. once i noticed the drop in pressure i pulled out from the stop light hanging my head out of the window listening and between 2000 and 3500 rpms a knock has developed. makes my skin squirm hearing it. got it home and parked it. hard to hear the knock just revving the car. only really hear it under load. my thoughts started at broken or loose rocker arm. ill check that today when i change the oil to look for metal shavings . i was suggested the the oil pump went bad. my main thought and nightmare is that a bearing is letting loose. any thoughts before i check on this crap? with our cars being ODBII, would the loss in pressure throw a code? or if anything broke, would that throw a code? so the only good thing is, if the engine has to come out...he comes a forged bottem end. so what exactly does a forged bottem end consist of? whats a round about cost for one and what brands should be looking at?

GuitsBoy

iTrader: (4)

The computer wont tell you anything. Youre on the right track as far as looking for clues. Good luck man, i hope its not anything serious. Could just be a small bit of debris caught in the relief valve that might work its way out. Happened to me once with the same symptoms.

SSdreamz

iTrader: (3)

ok here is what i came across. drained the oil.....on the magnetic oil plug there was fine metal filings, ran a magnet through the old oil, and came across some metal flakes.
http://im1.shutterfly.com/procserv/4...6108QauGLRqyb0
http://im1.shutterfly.com/procserv/4...6108QauGLRqyb0
http://im1.shutterfly.com/procserv/4...6108QauGLRqyb0
http://im1.shutterfly.com/procserv/4...6108QauGLRqyb0

slimcracka

iTrader: (7)

main bearing?

DaddySS

Bearing material is mostly not magnetic, if a rod was bad enough to shave the crank you'd hear it. That leaves cam, and lifters that I can think of but doesn't explain the drop in preesure. How bad is the knock, and you can't hear it just idling?

dschmittie1

iTrader: (64)

I went over to his house today and listened to this before he drained the oil and saw the metal flakes. It isn't really noticeable at idle but if you pick up the rpm's you can hear it. It is really loud while driving at 2000-3000 rpm. To me it doesn't sounds like a valve train noise. It is a solid sounding knock But you can hear it in the top of the motor no really under the car so much. I was kind or thinking it might be a wrist pin or something. Since it is a lot louder when the car is under load I think it would be in the buttom end. And a spun or bad bearing could account for the reduced oil preasure

SSdreamz

iTrader: (3)

the flakes that i retrieved out of the oil werent magnetic... i strained the oil through some shop towels. one side of the metal flake looks shiney the other side like copper...im thinking rod bearings or main

LS1-IROC

iTrader: (4)

Sounds like a bearing issue to me......non-metallic flakes, drop in pressure and a knock under load are sure signs

GuitsBoy

iTrader: (4)

Put a bright dot on the crank pulley and using the throttle body, rev it up to 2.5K where you hear the sound. You should be able to tell if the noise is at full engine speed (crank or main bearings) or half engine speed (valvetrain, cam, or lifters). That should help you narrow it down.

SSdreamz

iTrader: (3)

i dont quite follow you on the whole "dot" thing...could you explain exactly what id be looking for?

SSdreamz

iTrader: (3)

any suggestions on brands and so forth on a forged bottem end? not cheap but not too pricey!

SSdreamz

iTrader: (3)

T.T.T. need all the help i can get

SSdreamz

iTrader: (3)

byunspeed.com has a 383 rotating assembly for 2,099.00

Our Competition Rotating Assemblies feature our premium forged 4340 H-beam rods and 4340 steel crankshafts. Teamed with premium forged pistons from JE for the best assembly possible. Also included are Clevite 77 race bearings and JE plasma-moly rings. All are designed for internal balance. Competition Assemblies are the perfect choice for the most demanding applications.

stay away or doesnt look bad? im new to all this internal bottem end stuff, so i may be asking dumb questions but like i said i need all the help i can get

JJB

iTrader: (12)

put the emergancy brake on...put the car in first and/or drive and ease on the gas...if the knock gets very loud under load ...probably is a bearing...mains are notarious for singing when this is done...good luck