525e ETA Crank

[Andy_magic]

Drop one and you'll love the crank either way

I suppose if you measured a big end journal and then measure distance the outside edge of the journal moves when rotated 180 degrees and subtract the first measurement from the second you'll get the stroke. Hopefully 81mm

[Turbo-Brown]

You might not have worry too much about pressure charging being the cause of a broken crank. The pressure loads on the crank, pistons, rods etc. increase linearly so if you took an M20 and made it twice as powerful with forced induction, the loads on the various bits would double (roughly speaking)

However, with increasing revs the loads increase exponentially (well as a square of crank speed anyway) so for example, if you up the rev limit from 6000rpm to 7200rpm, the inertial loads in the bits increase by 144% i.e. a LOT more than double for not a huge increase in power.

[Andy_magic]

The exponential increase in crank loading was my reason for not going over 6200.

I find that if a car will rev to say 6200 rpm I will use that limit, I'd rather have it limited at 6200 than 7000 as it would find itself on the limiter either way. These things aren't cheap and I onyl want to fork out for one!! I'll stick with 6200.