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tap tap tap tap tap tap tap tap tap tapping

This is a discussion on tap tap tap tap tap tap tap tap tap tapping within the Internal Engine forums, part of the LSx Technical Help Section category; here's the scenerio: car club was in a parade, naturally revving engines/making noise. I probably went to 6500 and 7000 ...

  1. #1
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    Exclamation tap tap tap tap tap tap tap tap tap tapping

    here's the scenerio:

    car club was in a parade, naturally revving engines/making noise. I probably went to 6500 and 7000 regularly [imagine doing that about 90 times over the course of a mile] Pulled into a parking lot afterwords to hear i'm the only car with a really high pitch tapping / pinging noise coming from the engine....shut off the car, lifted the hood to cool it off for a good 45 minutes. Turned it on....noise is still there. Oh, someone said that since i'm running fully synthetic oil that could be the problem?

    What'd i do? What do i do? what's it gonna cost?

  2. #2
    SShArK>
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    maybe a pushrod?

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    Blown, Stroked, & Sprayed

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    6500 to 7000? I hope you have an aftermarket drivetrain.
    Other wised you floated the valves and they tapped the pistons.

    Bent valves.

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    local car guru says it's a lifter. anyone know if an LT1 lifter can replace an LS1 lifter?

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    Blown, Stroked, & Sprayed

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    Stock valvetrain?

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    sounds like a bent pushrod or a bent valve tapping the piston, I would pull the heads off and inspect before you run the car again.

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    Quote Originally Posted by Ed Blown Vert
    Stock valvetrain?
    yes, stock everything

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    Member keliente's Avatar
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    It sounds like a pushrod to me. It's a light tap/tick noise that increases with RPM...you'll also notice a loss of power over ~5k rpms. I bent a couple a few months ago when I shifted from 3rd to 2nd @ 100mph...whoops!

    It is a very easy fix. Remove emissions crap, coil pack brackets, valve covers. Remove rocker arms and the pushrods pull right out. When you roll them on a flat surface you'll notice which are bent - they won't roll smoothly. New pushrods are very cheap. When you reinstall don't forget correct torque specs & loctite on the rocker arm bolts.

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    kelli, my savior! thanks-yes thats what it does too, increases with rpm

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    Whoa...! Don't do that kind of revving with the stock valvetrain.

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    Blown, Stroked, & Sprayed

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    Quote Originally Posted by dipherentdesign
    yes, stock everything

    Ok, its either bent pushrods or valves.

    Don't rev it over 6k on a stock valvetrain. You probably aren't making anymore power over 5800 anyways.

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    Quote Originally Posted by keliente
    New pushrods are very cheap.
    Aftermarket are cheaper than the GM ones.
    If it is only one pushrod bent, PM me. I have one still in wrapper from GM.

    If you go with aftermarket pushrods, they won't bend to save your valves. If you go around revving like that you will pop a valve stem with hardened pushrods.
    I wouldn't do revving like that WITH an upgraded valvetrain. You are gonna break something doing that. Overall, try not to free-rev.
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    6500-7000 RPMs? did u mess with the rev-limiter with a programmer or something because to the best of my knowledge it wont let u rev that high from the factory right?

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    Quote Originally Posted by LS1Power06
    6500-7000 RPMs? did u mess with the rev-limiter with a programmer or something because to the best of my knowledge it wont let u rev that high from the factory right?
    yes he did.

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    anybody know where i can get stock pushrods OVERNIGHTED to me?

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    Blown, Stroked, & Sprayed

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    I have a set, but don't think I can get them out tomorrow.

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    Quote Originally Posted by dipherentdesign
    anybody know where i can get stock pushrods OVERNIGHTED to me?
    I have a set of used ones out of my ss. also I have a set of rockers. Let me know if you want them i will part with them cheap , make an offer

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    Quote Originally Posted by sscrazy
    I have a set of used ones out of my ss. also I have a set of rockers. Let me know if you want them i will part with them cheap , make an offer
    i'll consider those rockers...don't know if we'll need them jsut yet.

  19. #19
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    How were you able to rev it that high without hitting the limiter?

    *EDIT* My bad, completely missed about 5 posts there.
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    OK HERE'S THE UPDATE!!!!

    so my buddy an i crackopen the valve cover on the passenger side to see that rocker #2 is EXTREMELY loose. So we inspect the pushrod; it's fine. Inspect the rocker; it's fine...oh shit...gotta keep digging-it was a broken LIFTER! it took us like 6 hours of unscrewing, unbolting and digging....we had to take off the manifold covers, the intake and the headders to finally reveal a single broken lifter. It sucked that we had to do all that but it was better than being charged 700+ in time/parts to have the pros do it.

    i've learned a lot about this engine just in doing all of this...

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