hfddauzat

iTrader: (1)

Would anyone mind explaining the symptoms and differences of each: Spun bearing, Piston slap, and valavetrain related problem

My 02 z28 ls1 bone stock w/50,000 miles has a tapping/ticking noise that is rpm subjective and goes away 100% once the motor is warm, does that generally point to piston slap or lazy lifter or maybe exhaust leak? I can hear it under the car just as good as opening the hood, can also hear it inside the car.

Also, If there are no oil pressure issues or oil consumption would that point to either piston slap or valvetrain related too?

I've searched other people's threads and some responses indicated spun bearing, and some responses were piston slap, which is why I started a new thread.

19BLACKBIRD99

I think its just a normal sound, I've owned two F bodies, and they both do it until they were warm.

Blackhawk777

Piston slap from what I've heard is more of a slight knock when cold, but does go away as it warms up. Lifter noise and exhaust leaks are real similar in sound. If you can pinpoint exactly where it's coming from, it'll help big time in diagnosing it. I thought I had lifter tick at one point, but it's coming from a seam on my Y pipe, so no lifter worries, it's an exhaust leak. Piston slap has no real relation to oiling issues. valvetrain MIGHT affect oil pressure a little, but I would imagine it's not much. You would know a spun bearing instantly, so you can rule that out. lack of power, loud knocking and lots of oil issues IE no pressure, violently fluctuating pressure at idle..... all the fun stuff. Again, it all boils down to finding the exact area of the tick/tap.

19BLACKBIRD99

Yeah, my old bird had and exhaust leak as well, and sounded the same

95formulalt1

iTrader: (13)

the TA does the same thing. a lil nose when cold then it warms up and its fine. my oil presure is about 60-70. in my old motor i spun a cam bearing and it sounded like hell. oil presure was down 25-40.
you could always use lucas oil adder to quit it down?!? maybe

hfddauzat

iTrader: (1)

Thanks for the fast replys, I just bought the car in dallas last week and drove it down to houston and it is super quick. It just bothers me, I don't even like to drive it when its ticking, It takes a good 8 min for it to warm up and quiet down before I even take off.

So as long as the noise goes away once it gets warm, there should not be anything to worry about? And when I mean warm I mean operating temp, not 30 seconds.

95formulalt1

iTrader: (13)

if the noise didnt go away or got louder when it was at operating tem i would say you have a problem but its gone when its warm your ok. you should always let it warm up befor taking off. do an oil change and try the lucas oil adder. it will keep it quit.

hfddauzat

iTrader: (1)

Cool thanks for the help, I'm still hoping for an exhaust leak. I doubt it, but that would be nice. Maybe I'll just throw in some straight 50 weight racing oil and be done with it lol

bongva

iTrader: (7)

my car has that noise too, but it seemed like just tonight it got slightly louder.... any input on that guys?