Soul TKR

iTrader: (4)

what would cause this? It's kinda old news, since it was in my previous engine of which my car is in the shop for getting a new one... but I'm just curious as to what would cause every piston and valve to hit?

any theories?

jkwalkercchs

iTrader: (21)

ptv issues???


to big of a cam no fly cutting

slow95z

iTrader: (33)

having the timing chain set wrong would be my first guess

Z28/2002

iTrader: (27)

Not checking piston to valve clearance

Soul TKR

iTrader: (4)

Guess I should have mentioned everything was stock...

so no need to check all those things....

99mongooSS

iTrader: (4)

multiple springs breaking or rod bolts stretching, but unlikely. not all at once anyways...maybe your chain stretching

Soul TKR

iTrader: (4)

hmmm.... no springs were broken...

however, and i don't know if this all happened at the same time, but, i had a failed lifter 3 bent pushrods, and spun a bearing...

just wonder what went first, and if there's any connection between all them that might would cause the valves to hit the pistons...

THE CHOP SHOP

iTrader: (7)

Timing chain did not break right?

Mike454SS

iTrader: (4)

Was there an extreme mechanical overrev from a blown shift anywhere in the engines history?

Soul TKR

iTrader: (4)

no the timing chain was fine...

Ryne at CMS seems to think my buddy revved the **** out of my engine the night all this took place...

When he was driving, he was DEFINATELY "on it".... as far as "overrev"? To be honest I don't really know what qualifies as "overrev"

all i know is A LOT of things got f'ed up that night... hell, he even somehow shot a bearing out of my water pump...

tripblackls1

iTrader: (11)

if the chain did not break it probly "jumped" which is very well possible if your motor had some desent miles on it and you "freind" was beating the crap out of it

Soul TKR

iTrader: (4)

by jumping you mean the chain jumping links on the sprocket?

it had 118k miles...

Hardtop

iTrader: (3)

M6 or A4? If M6 you may have over revved the motor by downshifting into the wrong gear.

slow trap

iTrader: (22)

with that many miles i would venture out on a limb and say it was over revved along with weak valve springs and it went into valve float.

Soul TKR

iTrader: (4)

I think a little bit of both of those came into play... Ryne @ CMS mentioned valve float... interesting stuff... never knew this was possible with a stock cam, much less stock engine...

SOMbitch

iTrader: (8)

Yes, that is what he meant. It can happen.

The Alchemist

iTrader: (19)

My guess is springs were weak being 118k miles on them, and he hit some high rpms and got valve float. The pistons were just helping the valve springs close the valves.

I had the same thing happen. I had weak springs on my motor, and ended up having one broken, and when I pulled the springs, I snapped a rocker arm bolt on #7, so I pulled the head. Well, all of the pistons had been kissed by the intake valves. None of the stock pushrods bent, and now that the new springs are in, I don't have any issues. I just look at it as I flycut the pistons like 0.005" using the valves.

Cheatin' Chad

iTrader: (3)

what cam was in it? Stock rods/pistons/Heads?

bjamick

iTrader: (31)

My guess is if the car didn't have a rev limiter on it your friend could have revved the **** out of it. Then caused some valve float, and the pistons hit the valves. Thats my Hypothesis. As long as the car was completely stock.

Soul TKR

iTrader: (4)

all stock...