(09-11-2018, 08:25 PM)Terrytuned Wrote: Here are a couple of 2 bearing Phoenix 1 5/16" cranks that came out of race engines I would only advise an 1 1/2" crank for racing.
Terry.
Crikey
(09-11-2018, 08:40 PM)Bob Culver Wrote: Hi KC
Your post appeared while I was still pondering.
It is not as classic as most. I am not sure where final fracture is. Usually crack starts at inside and works outward, but seems to have formed at outer diameter. Is it from an engine in normal use or high rpm?
Must admit I've been re-examining it myself and wondering the same Bob. I'm no expert but I reckon it's 2 cracks which have met up in the middle. Evidence slightly obscured by the subsequent mashing together. It was an engine in normal use by a 20 year-old student <ahem>
(09-11-2018, 09:10 PM)Ruairidh Dunford Wrote: Those are spectacular failures Terry!
This rod was in the ‘26 Heavy 12/4 - we were returning to Bristol after a long weekend in Lake District. As we passed Gloucester on the M5, doing about 45/50mph, there was an almighty bang and tremendous vibration. My father pulled over and eventually we were relayed the last 25 miles home.
On stripping there was no sign of the piston - just thousands of tiny aluminium pieces.
The rod was in the sump and the engine still ran. This rod is about twice the size of an A7 one.
I always thought it would make a good novelty toolbox handle...
'the engine still ran...' Impressive!
It's the M5 triangle Ruairidh... mine went within pushing distance (you could get away with it in those days) of Taunton Deane services, luckily not so far that Dad couldn't come up and trailer me home. Apart from one occasion when I was still running but decided not to chance it, the only time she's not come home under her own steam (looking for wood to touch...)