I was in my car do not know exactly how fast i was going but i do know that i went from 5th gear to second and it made a few clings and then it completely died. I got off the highway and started my car, it didnt sound right so i had it taken home on a roll back. Anyway i have no compression in the 3rd cylinder on the driver side and the 2nd cylinder came up to 35 the others are in the 100's and i replaced all pushrods. So what do you all think is wrong?

 

Almost certainly bent valves. The easiest way to check is with compressed air. With all rocker arms removed, use a spark plug adaptor to feed compressed air into each cylinder. Then check to see if air comes out of the intake then its a bent intake valve, exhaust, bent exhaust valve. Sorry man, but this is probably it. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

Shane

 

How did you go from 5th to 2nd? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Thats some serious over rev if you were really movin...

 

would that make me have dead cylinders, or what?
do you think i have bad pistons now?
also it sounds like there is not enough fuel getting into the car and it smells real rich when you start it. Also my motor kinda moves around so what all do you think is wrong?

 

You definitely have bent valves. If you are smelling raw fuel, that is the raw intake charge getting pushed back out of an open (bent open) intake valve. This is why you have no compression on those cylinders. The valves are bent and not able to seal against the seat. Hopefully you haven't damaged a piston (probably not, they are pretty tough) but the shock of the valve striking the piston may shorten the bearing life on that rod. You're going to need to pull the heads and have the bent valves replaced at a minimum.

Sorry Nasty. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

Shane

 

Just got done the compression check.
Drivers side#1 170
drivers side#2 35
drivers side#3 0
drivers side#4 125

Passenger side#1 155
passenger side#2 150
passenger side#3 0
Passenger side#4 140

IS this definitely Bent Valves? Should I worry about the pistons being damaged?

Please help... <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

 

pull the heads and you will see the dings in the pistons. Hopefully the bent valves are all thats damaged

 

It's bent valves and pushrods for sure. Good time to pull the heads and have them ported. Put a cam in there too.

Chances are that there is no piston damage. They can take a pretty good wack.

Mikey

 

BTW, this is a post regarding my brother's '00 SS Z28. My brother posted under my name. Looks like I'll be contacting ValveGod for a new set of heads.

 

The pistons will definitly be damaged, but you can probably get away with still using them without any issues. Should just be dinged up a bit. If there are any sharp edges on the ridge thats marked into the piston, you might want to file those down a bit before you put the new heads back on.

 

Nasty,

Is he getting new heads just so he can keep his stock ones? The heads will be fine even with bent valves.

Shane

 

Cajun, new heads are dirt cheap from valvegod and come fully assembled ready to go. He's probably just getting them for a quick and easy replacement. Plus, sometimes when the valve comes back up it marks up the head a bit which would possibly need to be fixed too.

 

Yeah, that's true I had forgotten how cheap these things are now...

 

Anyone got the part #'s for the intake and exhaust valves if we went that route? I'd much rather just get the new heads from Valvegod completely assembled and ready to go.

 

I'm sorry to hear that. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

Tell Alex I've got some heads that I can do a quick bowl port on, complete with valves and everything. I would imagine that with bent valves the valvejob could definately be mucked up. I'll have to check and see, but I may even have never run 2000 heads with the fresh valvejob. I know I have some 98's.

Have him drop me an email and we'll get him back on the road.

 

I got a set of '00 completed heads ready to go from Valvegod (sorry jantzer but we aren't rewarding our brother for smashing vavles with ported heads lol <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> ).

There's also metal shavings on his dipstick. What could those be from? Thanks.

 

Are they from the rocker arms? Have you changed his oil since he messed up his car?

 

Hrm... it maaaay not be 100$ valvetrain.

I would seriously consider checking out the bottom end. You can use or have someone use a standoff guage to see how far each piston comes up while rotating the engine with the heads off. That will usually tell you if you bent a rod.

That would be good if it was only the valvetrain. Too high RPMs can pull the wrist pins out of the bottom of the piston, like in my avatar to the left <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
<-------

Good luck! ALSO: Bending valves can cause scoring of the guides, which can cause a seize later. I would have a local shop or Jantzer, if he can, check the guides to see if they are still good. Would suck to put everything back together and seize a valve.

\chrisn

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Z00:
<strong>Are they from the rocker arms? Have you changed his oil since he messed up his car?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Allen, no, we're gonna do that first (before we start removing the heads.) The rocker arms looked fine as far as I could tell. Anything out of ordinary I should look at? Thanks.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"><strong>I would seriously consider checking out the bottom end. You can use or have someone use a standoff guage to see how far each piston comes up while rotating the engine with the heads off. That will usually tell you if you bent a rod.

That would be good if it was only the valvetrain. Too high RPMs can pull the wrist pins out of the bottom of the piston, </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What type of gauge do you recommend? We're gonna pull the heads off first and go from there.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Visceral:
<strong>Hrm... it maaaay not be 100$ valvetrain.

</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Even after seeing the compression test results you think it may not be bent valves?