Random clacking coming from the Head?

[tpetrucci33]

I just purchased a 91 AWD Talon. Bought it non running and the seller stated that theres something wrong with the motor. The seller said he heard some knocking from the engine so he thought it would be a good idea to add some oil.... WRONG!!! He seriously had about 8 quarts too much!!!!!!!!!!

Who does that?!?! So now here's what is going on... I got the car to start and idle fairly easy. Idles decent and doesnt seem to miss a beat.

For the fun part... There is a random clacking noise that sounds like its coming from the valvetrain, but i could be wrong. At idle, it will clack, run fine, then clack clack, and so on....

When I give it a little rev, obviously it clacks a little more. I pulled the valve cover off and everything up top seens perfectly fine. No scoring on the camshafts or any metal shavings in the head.

Any thoughts on this? Im thinking the kid bought the car and got all rev happy and over revved the stock valvetrain, heard some knock, and added wayyy too much oil.

Something is pushing me towards a binding valvespring, bent valve (most likely not the noise because its inconsistent), or maybe a bad lifter???

I ran compression and they sit at 148, 145, 110, 149. I dropped a little cap of oil into the cylinder that had low compression and it bumped it up 35 psi. So it seems that the rings are bad there. But wouldnt a bent valve cause that cylinder to not reach it's full compression potential??

Thanks in advance for reading this. Any legitimate thoughts or ideas would be great. I'm probably going to pull the head today and take it to my buddy's machine shop to get it inspected.

Thanks!!

 

[J_HEATH]

Sounds like a rod knocking.

The only way you can check anything for sure is to tear it apart. Goodluck and let us know what you find out.

 

[Archer Fabrications]

you should try scat rods, made from the same blank as eagle, and manley, but cheaper!

 

[tpetrucci33]

Has anyone ran any decent testing with these yet?

 

[Archer Fabrications]

Has anyone ran any decent testing with these yet?

the scats? i am and i beat the piss outa my motor, holds up awesome! gonna run them with the hx40

 

[camas90gsx]

Doesnt ring a bell at all sorry .. Gotta love the IT industry. Starbucks coffee machine on tap!! hahaha just about the only thing that pushes me through the day.

1G Talon AWD Rod Knock - YouTube

PLEASE FOLLOW THE LINK ABOVE TO VIEW THE VIDEO

Wow, i just watched the video.100% no doubt sounds like knock or a spun bearing man.Did you drop the oil yet just to see what it looks like? Im telling you man,just drop the oil and look if it has glitter and anything out of the ordinary with it.That should have been the first thing you did,short of dropping the oil pan and actually looking at what damage you have done so far.You might be able to salvage something from the shortblock,i doubt it from the sound of it but you never know. You will never know until you drop the oil and look though.

 

[tpetrucci33]

Hey what kind of power are you putting out with that setup?


And what damage I have done?? Haha I purchased the car like that. The damage is already done. Obviously the previous owner beat the piss with a half ass build. But on the other hand, I've just picked up a fresh head and block. Bother are in good running condition...

Now for the fun part.... Should I slap it all together? Or build this bad boy?! I think its all a matter of how soon I want to have the car on the road.

 

[J_HEATH]

I would get the new (to you) head rebuilt. IE decked, vatted, new seals, have the valves checked. As for the block have the line bore checked and the crank. Get it vatted and buy all new parts for it. Head studs, mains, bearings, front cover, water pump, tensioner, idle pulleys, so on. If you can afford rod & pistons then get them and have the cylinders bored over.

 

[tpetrucci33]

It's official!

Today I had some extra time on my hands so I pulled off the cylinder head. 2 pistons had a ton of play up and down. All pistons had play pressing them from side to side. I've already purchased a used block and head. So out this comes for the full build and in goes the stock setup for now! Had is going to be refreshed and the rod bearings are going to be replaced just becuase it's simple and cost effective.