I thought pushrods were supposed to be straight??
08-26-2011, 09:57 PM
#1
Launching!
Thread Starter
iTrader: (1)
Join Date: Jul 2004
Location: the shit hole of Albuquerque, New Mexico
Posts: 251
Likes: 0
Received 1 Like
on
1 Post
I thought pushrods were supposed to be straight?? Well I had been chasing down a miss in the 00 blue Z and after plugs and wires i pulled the valve cover on the drivers side and found a loose rocker arm.
Low and behold I pulled out this:
I haven't pulled the passenger side yet so there may be more bent push rods.
Hopefully there isn't more internal damage but I have a feeling the pistons and valves kissed each other a few times. Oh well, another good excuse to mod.
Low and behold I pulled out this:
I haven't pulled the passenger side yet so there may be more bent push rods. Hopefully there isn't more internal damage but I have a feeling the pistons and valves kissed each other a few times. Oh well, another good excuse to mod.
Last edited by Tall Guy; 01-12-2014 at 01:54 PM.
08-26-2011, 11:57 PM
#7
it is a very common problem, especially with the stock Hurst shifter and stock pushrods for the driver to shift form 3rd to 2nd, while trying to hit 4th. this causes the motor to hit redline in 2nd while trying to slow down the car. it then brakes the weakest link, the pushrods. if he had hardened pushrods he could have hurt the tranny. i would say pull the other valve cover, and change all the pushrods. torque them all to 22 ftlbs and be on your way. get some hardened ones, not stock replacements.
Trending Topics
08-27-2011, 12:46 AM
#9
Launching!
Thread Starter
iTrader: (1)
Join Date: Jul 2004
Location: the shit hole of Albuquerque, New Mexico
Posts: 251
Likes: 0
Received 1 Like
on
1 Post
it is a very common problem, especially with the stock Hurst shifter and stock pushrods for the driver to shift form 3rd to 2nd, while trying to hit 4th. this causes the motor to hit redline in 2nd while trying to slow down the car. it then brakes the weakest link, the pushrods. if he had hardened pushrods he could have hurt the tranny. i would say pull the other valve cover, and change all the pushrods. torque them all to 22 ftlbs and be on your way. get some hardened ones, not stock replacements.
08-27-2011, 12:51 AM
#10
Restricted User
iTrader: (12)
Join Date: Feb 2010
Location: kansas
Posts: 1,794
Likes: 0
Received 0 Likes
on
0 Posts
Goodluck. Hopefully just the pushrods are bent from a missed gear like mentioned above^^^ and you can replace them and be good for awhile. how many miles you got on the motor? I would definetly change the oil asap to get any scraped metal out of there before it gets in the bearings and everything else.
08-27-2011, 09:05 AM
#12
TECH Fanatic
08-27-2011, 10:04 AM
#14
TECH Addict
iTrader: (14)
Join Date: Feb 2007
Location: Owasso, OK
Posts: 2,342
Likes: 0
Received 0 Likes
on
0 Posts
Exactly my point! How are pushrods gonna save the trans? If you go in to second instead of fourth, the pushrods won't save anything exept maybe the rest of the valve train or a few pistons if you rev it high enough. What exactly would a person break in the transmission if they downshifted on accident with hardened pushrods? Seriously?
08-27-2011, 10:32 AM
#15
that's great advice. that way next time this happens he can bend a valve instead. 
i wouldn't suggest using hardened pushrods with the stock cam, there is really no need, plus odds are he will need a dif length with an aftermarket cam. so then he'd be buying them twice.
i wouldn't suggest using hardened pushrods with the stock cam, there is really no need, plus odds are he will need a dif length with an aftermarket cam. so then he'd be buying them twice.
08-27-2011, 11:05 AM
#17
Exactly my point! How are pushrods gonna save the trans? If you go in to second instead of fourth, the pushrods won't save anything exept maybe the rest of the valve train or a few pistons if you rev it high enough. What exactly would a person break in the transmission if they downshifted on accident with hardened pushrods? Seriously?
think of it this way, you are going 90+mph in 3rd and shift to 4th, but accidentally hit second. 2nd gear is made to go to maybe 80mph...maybe, then you have 10mph that the engine can not compensate for. the motor will immediately got to 6200 rpms (redline) and stay there, and force the car to go from 90 to 80 instantly, locking up the rear end and putting a tremendous amount of force on the bearings that are trying to slow down the car so the motor can function. that is why the tranny is then the weak link. easiest way to prevent this from happening, get an aftermarket shifter. i have a Pro 5.0 and love it.
08-27-2011, 11:51 AM
#19
Launching!
Thread Starter
iTrader: (1)
Join Date: Jul 2004
Location: the shit hole of Albuquerque, New Mexico
Posts: 251
Likes: 0
Received 1 Like
on
1 Post
As far as my pushrod deal, I am probably going to stay stock to get it running for now. I have plans for a long block from LPE here soon. I still need to check the passenger side for any other suprises.
08-27-2011, 01:06 PM
#20
instead of the pushrods taking the initial hit from the motor over reving then the motor holds and transfers the torque hit through the main shaft, hurting your main shaft and bearings. the main shaft my be able to take the sudden jolt but the bearings cant.
think of it this way, you are going 90+mph in 3rd and shift to 4th, but accidentally hit second. 2nd gear is made to go to maybe 80mph...maybe, then you have 10mph that the engine can not compensate for. the motor will immediately got to 6200 rpms (redline) and stay there, and force the car to go from 90 to 80 instantly, locking up the rear end and putting a tremendous amount of force on the bearings that are trying to slow down the car so the motor can function. that is why the tranny is then the weak link. easiest way to prevent this from happening, get an aftermarket shifter. i have a Pro 5.0 and love it.
think of it this way, you are going 90+mph in 3rd and shift to 4th, but accidentally hit second. 2nd gear is made to go to maybe 80mph...maybe, then you have 10mph that the engine can not compensate for. the motor will immediately got to 6200 rpms (redline) and stay there, and force the car to go from 90 to 80 instantly, locking up the rear end and putting a tremendous amount of force on the bearings that are trying to slow down the car so the motor can function. that is why the tranny is then the weak link. easiest way to prevent this from happening, get an aftermarket shifter. i have a Pro 5.0 and love it.
You have no idea what you are talking about... The motor will easily go over 6200 rpm, because that is fuel dependant rev limit, the engine will still over rev. You arent locking **** up from 90-80 instantly, and the trans will hold it easily, the valvetrain probably not so much...
If you were racing, chances are you are at 6000 or so before you shifted, which means the motor will see ~8100rpm if the clutch doesnt slip and no speed what so ever is lost.