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John - no failed nuts or studs - all looked good when stripping down, although I am going to try to retorque the heads back on tonight before I strip it to see if the studs are / have been stretched pulled previously as they were very rusty (Tip from your apprentice )
Will check through the history file I have on it tonight for any previous work.
Doug - I was pulling out of a junction from first into second, fairly low engine speed. Had only being going a couple of miles so engine still very cold, did have a noise earlier in the day but nothing that would have led me to believe it was about to detonate
James, I think that the noise earlier in the day was probably a chain tensioner starting to fail - the resultant cam timing fluctuations have caused the inlet valve and piston to collide repeatedly, this is why there is so much damage to the piston. The head of the valve has snapped off and then been crushed between the cylinder head and the piston. I have a good cylinder head and maybe a cylinder barrel but no piston, you can have these for postage costs (and maybe make a charity donation via Barry !)
Hope this helps.
Chris - my first thought too was the chain tensioners, but I only replaced mine less than 1500 miles ago with new 930 types. I made sure that I bled them too before installing. The first thing I checked when I pulled the engine was the tensioners - and they were spot on
I had been having mixture problems with the MFI and think it was set lean (wouldnt idle when warm and cylinder number 2 looks pale around the edges in the picture) wasnt sure if this might have contributed to the failure of the valve?
Re your most generous offer, I'll definitely take the cylinder head off you, but will probably replace the cylinders and pistons with new (barrel number 6 didnt survive unscathed either ) I'll drop you a PM now
Many thanks indeed
bad luck James, but thanks for sharing the pictures with us! Hope you get it sorted out OK.
cheers, Mike.
previously..
1994 968 Club Sport Riviera Blue
1994 993 C2 Carrera Riviera Blue
1972 911S to Martini RSR Prototype Spec
1973 911E to RS Lightweight Specification
1981 924 Carrera GT ex Mexborough car
3.2 Carrera Sport x2
butzsi wrote: I have a good cylinder head and maybe a cylinder barrel but no piston, you can have these for postage costs (and maybe make a charity donation via Barry !)
Hope this helps.
Chris
Top man, very generous Chris, thank you!
DDK Member1243 07741 273865. Home of the RY Austin 7 Trophy's and Austin Single Seat Racers
(Tip from your apprentice 
Top man, very generous Chris, thank you!
