What are you talking about? 
loud tapping goes with the rpms PLEASE HELP
loud tapping goes with the rpms PLEASE HELP hey whats up i just got my car dyno tuned and when i was driving it home i revved the motor to about 6600 rpm but when i got home it was making a loud tapping noise and it goes with the rpms what do you think it could be my oil pressure is still good.also how do you check if i collapsed a lifter.
Could be a lifter, bent pushrod, a rocker bolt could have backed out.... Time to open up the valve covers and check it all out. If everything looks kosher, then you'd have to pull the heads to check the lifters.
12 Second Club
Joined: Mar 2003
Posts: 334
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From: jonesville, MI
Does the noise sound like valvetrain (upper/half speed) or bottom end? You can place a stethoscope or long screwdriver on the valve cover and listen for the area that is loudest for valvetrain. It may be counting a few missfires on suspect cylinder too (may not be enough to set code). You could have it scanned.
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Verdad Gallardo Edit: I see that you weren't talking to me, but the guy that posted right before me. I was really confused for a second there. I thought your comment had something to do with mine due to the fact you posted right after me.
Originally Posted by ArcticZ28
Edit: I see that you weren't talking to me, but the guy that posted right before me. I was really confused for a second there. I thought your comment had something to do with mine due to the fact you posted right after me.
Originally Posted by fstls2camaro
PLEASE HELP
jk, good luck
Originally Posted by 02NBMWS6
it had everything to do with yours, he's saying it could still be a spun bearing with good oil pressure.
Originally Posted by ArcticZ28
Actually, if you look at the post right above mine, that's what he's referring to. I have no idea how he could be referring to my post(s). If you have any clue as to how the oil propagates through the engine you would know that a spun bearing opens up a lot of clearance between it and the crank or cam, whichever one it is. More clearance equals less pressure in the system. This is a tell-tale sign of a spun bearing.
Originally Posted by 02NBMWS6
dude, he quoted you. twice. maybe you disagree about the oil pressure thing. but i am pretty sure he is saying that you can have low oil (which could cause a spun bearing) and still have good pressure
Damn all this for me?
A friend of mine spun a bearing and there was no change in oil pressure (that we saw). Had a tick that we were sure was valvetrain noise. Finally tore down the engine and saw what the cause was.....two bearings that looked pretty bad and another that was worn. This "tick" started after a WOT run down 1 quart of oil.
I'm not going to argue the point. There are too many experts on here for that. All I'm saying is what I saw and heard on his engine.
A friend of mine spun a bearing and there was no change in oil pressure (that we saw). Had a tick that we were sure was valvetrain noise. Finally tore down the engine and saw what the cause was.....two bearings that looked pretty bad and another that was worn. This "tick" started after a WOT run down 1 quart of oil.
I'm not going to argue the point. There are too many experts on here for that. All I'm saying is what I saw and heard on his engine.
If there is a spun bearing, more than likely there will be copper color shaving in the oil filter cut it in half and look at the element in the filter. I have definately seen on more than one occasion a spun bearing not affecting the oil pressure.
