Looking at some really nice cranks lately, and hearing some stories of cracking at tail in both c clip and non c clip versions. Is it just the mad revs causing this, or are there other theories? When engaging clutch at high revs could the tiniest misalignment of flywheel centring cause eccentric forces that end up in the dreaded three prong crack..? All theories and remedy suggestions welcome.

yeah theres the "de-clutch" theory (which i can agree with to a point) yes
& then there is all the harmonics added to the flywheel wobble with it sitting so far outward/rearward
then there is all the other fatigues goin on
it`s anyones guess
so yes it really is a case of attempting to elliminate or at least try to lessen the chances of it happening, any way you can
but like i`ve said a million times, you can do what ever you can & they can still go bang

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Hi FNQ

I have had the unfortunate experience of an MED arrows crank fail in my race car. GR inspected the crank and his opinion was the the slot cut in the tail of the crank had weakened the nitride, this problem has occurred in a couple of other cars that I am aware of and I am unsure wether arrows have resolved the issue. I still use the MED arrows crank anyway so time will tell.

Cheers
Chris

Chris, very sorry to here of crank failure - i do hope you have better longevity with this one