Audi S4 SEVERELY over revved, what do you think I will find?
 

About 10:00 this am a tow truck pulls in with a nice looking S4 on the back. As they are unloading it, I am getting information from the customer, and it appers as if he was doing a little street racing this am. He said he was at or near redline in 4th gear, when he went to shift into 5th, somehow, ( dont ask me how ) he got a handful of 1st gear. He stated that the car stopped abrubptly.
Obviously , the car wont start now. It sounds as if it has no compression. I am assuming the valves are all folded over, and pounded into the head and the pistons.
This motor easily saw over 10k rpm. I will be unable to get this apart until next week, but I promise I will take some pics, and show you guys the carnage.
If anyone wants to take guesses at what will be broken, have at it.
This is a 4.2 litre v8

Define this. Engine quit pulling, engine locked up immediately, what?

JR

One word: Yikes.

Is this going to cost much?

i'm thinking that this will be really expensive.

I'm not familiar with the engine, but I'm guessing damaged pistons, bent valves, damaged valve guides, damaged/broken rocker arms and possibly damaged cylinders (from the pistons).

At least that's what I had when I downshifted from 4th to 1st (instead of 4th to 3rd) at 100 mph going into turn one at Road Atlanta. I barely got the clutch out, but the damage was done.

Actually, the motor spins quite well, I spun it with the starter a couple of revolutions just out of curiosity sake. It even made a few backfires through the intake. It spins rather fast and effortlessly. Sounds just like when a 944 throws its timing belt, and smashes all of the valves.
I cant define the car stopping abruptly ,that was his description, and I did not ask for further details. Audi's estimate was "more than five thousand dollars"

A little of this should fix that right up:

http://forums.pelicanparts.com/uploa...1269303492.jpg

Find a totaled s4, insert motor, crush rest.

had a similar thing happen on one of the twin turbo S4's brought into my old shop.....a turbo grenaded and parts of it got ingested into the intake. ended up with broken valves. the engine turned fine, backfired from intake, but wouldn't run.

Redline at 4th to 1st would definitely cause the car to decelerate very quickly.:eek:

Mechanical over rev. I think you will find some expensive abstract sculpture. Valve heads impaled in piston tops, pretzel valve stems, and very possible bent rods.
:(
Interesting photos to be sure.

prob toasted valves. no compression, motor would turn pretty easily.

i wonder if the engine would fit in a 944 hehe

you guys are overlooking the fact that the tranny/diffs are also probably toast......

You didn't say it was rattling, so I'll guess the valves are in one piece for the most part. One big bendy looking piece that will make great desk art, by the way. Pistons marred or cracked, maybe one or two with pieces of valves embedded + some scoring of the sidewalls from whatever bits broke loose will be the final nail in the coffin for this engine block.

I'm not really familiar with going from 4th to 1st, but thought the engine typically grenaded before the transmission.

Stretched / bent rods, a hole piston or two and a handful of bent valves thrown in for good measure.

well it is an all wheel drive car, i missed a shift years ago in my civic si, went from 2nd to 1st at about 8500rpm, tach went off the scale........ended up twisting the driveline side of the tranny shaft about 28 degrees, and that was in a little front drive car that weighed 2200lbs, suprisingly didn't bend any valves.....the audi weighs what? 3200? and it's all traction, and was said it stopped immediately....
i'll bet along with the engine something is REALLY wrong in there :D

All the valves will be bent, all of the pistons will have marks on them and I'd look at the rods REAL carefully....

JR

Valves, of course...pistons & bent rods more than likely...and yeah, probably driveline/gearbox problems as well.

cheap fix = chevy crate engine.
or.....motormeister

He must have been going pretty fast if he was @ redline in 4th. Sounds exciting.