Habit I'd like to BREAK!!!!

Once again... my truck's beggin' for me to give it a rest. :judge:

Click there ---> 13-Second Pass (No Video, Sorry) :burnrub:

Click there ---> Tapping/Knocking Noise (Video Clip)

Drove it there, and it ran consistent 13.6 - 13.7 second runs (6 times). Number 7 crippled the motor. :bomb: Dunno what happened just yet, but there's a terrible knock on the top, driver side of the motor. Hoping the bottom-end is undamaged, but there's no telling 'til I have time to pull it apart.
'Twas fun to see it run solid for a while. Yup, she left the track on this :cry:
http://i30.photobucket.com/albums/c3...1BrokeC101.jpg


Not to jynx myself even more, but unless there's a new motor going in, that'll probably be the last time it sees a track... there's not much more I can AFFORD to make it faster than it ran.... at least not as fast as I wanna make it. :(

It will be OK. Let's hope that's a rattle or tap and not a knock....a top end knock is worse than a bottom end rattle....LOL

It increases/decreases with RPMS... goes quiet for a couple seconds, then comes back loud. Maybe I'll take a video clip of it, and post it for a trivia challenge. LOL

Guess what's causing the knock! LMAO

Flat cam lobe or failed lifter...

failed lifter was the last thing a buddy and I said before loading it on the trailer. Only additional thing to worry about is if it IS a failed lifter, did it damage the cam? If that's the case, got a set of stock lifters out of my '02 Yukon 5.3L oiled up, and ready to go in. Just have to invest in another cam... assuming cam bearings are fine too.


Aww hell... this is getting expensive. LOL

Quote:

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Originally Posted by GasGuzzler

Flat cam lobe or failed lifter...

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+1

whichever it is bro i hope its only minor, good luck on your investigation lol

yeah good luck man, try and get a video up, I also got a top end tap I would love to get diagnosed.

Im sorry dude.That sucks!But you know it was worth it! LMAO!

Quote:

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Originally Posted by COWL327

Im sorry dude.That sucks!But you know it was worth it! LMAO!

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Bah!!! A 12-second pass would've been WORTH it! :)

Video clip of tapping/knocking added to fist post! Let the speculating begin.

broke spring perhaps....

Stock rockers?

Sounds like a cam, lifter, pushrod, spring, valve or rocker....

Rockers, springs, and pushrods "look" solid. I've gotten opinions of rod bearings from other folks, and a dragster pro (at the track) mentioned wrist pen. I wasn't planning on it, but I may just buy an engine stand & pull the whole motor out. Buddy's got a hoist I can borrow.

nah pulled the heads and check the lifters...also pull the cam out and check it out...once i had that same noise you are talking about and it turned out to be some metal missing from some of the lobes on the cam

Yep, I've seen that a couple times.

Didn't wanna commit to one single thing til I pulled the heads. Started removing some of the miscellaneous things around. Just got intake, manifolds, and head bolts left.

Going shopping for an engine stand tomorrow. Maybe I can catch one on sale. I'll see about borrowing an engine hoist. Only got this far... Didn't wanna break into much without being able to go all the way. Sorry for the crappy iPhone picture. Couldn't keep my hand steady enough.

http://i30.photobucket.com/albums/c3..._225/Motor.jpg