Couple of pics from my VXR8 engine fail....
Discussion
you done a good job of that
Nicely done, very unusual for an exhaust valve to fail though.
Hard to see in the pics, but compared to other engines where it has dropped valves, the damage almost seems well contained.
If the heads have been ported or anything, that does look like it could be repaired ok. What's the bore like ? Block and some other parts might be salvageable.
Hard to see in the pics, but compared to other engines where it has dropped valves, the damage almost seems well contained.
If the heads have been ported or anything, that does look like it could be repaired ok. What's the bore like ? Block and some other parts might be salvageable.
stevieturbo said:
Nicely done, very unusual for an exhaust valve to fail though.
Hard to see in the pics, but compared to other engines where it has dropped valves, the damage almost seems well contained.
If the heads have been ported or anything, that does look like it could be repaired ok. What's the bore like ? Block and some other parts might be salvageable.
What Stevie says ^^^Hard to see in the pics, but compared to other engines where it has dropped valves, the damage almost seems well contained.
If the heads have been ported or anything, that does look like it could be repaired ok. What's the bore like ? Block and some other parts might be salvageable.
The block (assuming the sleeve isn't fubar), other head, water pump, sensors will be fine. Lifters, cam, etc would need a visual.
New head, rods, pistons, rings, new oil pump, bit of work re-boring, new gaskets and fasteners. I'd go for a 4.00" stroker kit and make it worth the effort.
It's weird really.
I see no major signs that the piston has been hitting the head..anywhere that makes contact would generally be very clean, the chamber and flat parts are not clean.
Also very strange, is how little damage the combustion chamber has received, normally when a valve drops, the chamber is pounded into s
t.
The rod is still bolted to the crank, and if teh big end bearing failed that badly first, the knocking would have been obscene...and you would assume the driver would stop.
It does look like either a road or piston failure first off, which somehow took out the exhaust valve too, simply because of the lack of damage to the chamber from the piston beating the head of the valve into the chamber.
Likewise, the head of the valve looks almost intact, albeit slightly misplaced.
Any I've seen where the valve has failed first, is usually bent stupid from the beating, or even in a couple of pieces.
And where is the gudgeon pin ?
I see no major signs that the piston has been hitting the head..anywhere that makes contact would generally be very clean, the chamber and flat parts are not clean.
Also very strange, is how little damage the combustion chamber has received, normally when a valve drops, the chamber is pounded into s
t.The rod is still bolted to the crank, and if teh big end bearing failed that badly first, the knocking would have been obscene...and you would assume the driver would stop.
It does look like either a road or piston failure first off, which somehow took out the exhaust valve too, simply because of the lack of damage to the chamber from the piston beating the head of the valve into the chamber.
Likewise, the head of the valve looks almost intact, albeit slightly misplaced.
Any I've seen where the valve has failed first, is usually bent stupid from the beating, or even in a couple of pieces.
And where is the gudgeon pin ?
Edited by stevieturbo on Thursday 10th September 11:02
My money's on the rod failing first. The break line on the rod (picture 3) shows two different surfaces: one shiny on the left and one uniformly rough/grey across the rest of it. Guessing the shiny bit was a crack in the rod from earlier abuse. The carbon deposits on the top of the piston are undisturbed, so it didn't spend much time hitting the head. I'd say the end of the rod still attached to the crank spent its time whacking the detached piston until it split in two and fell to its doom. That's why the bore doesn't look too bad. Might also explain why the valves got hit, but the chamber didn't.
Edited by ArnieVXR on Thursday 10th September 21:02
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