Twins crankshaft sludgetraps early and late.

chasdev · Post by **chasdev** » Tue Dec 28, 2010 11:16 am

A few points, first thing the 56 crank pictured is a 600 not a 650.
Second, to be put back in service it would cost an estimated $400 (minimum)to repair the damaged journals so if I bust it seeking an answer, I won't spill too many tears.
Last, the plug is clearly an insert of some kind and if all the factory needed was centers, they would not have gone to the trouble and expense to machine and install the plugs unless it served some larger purpose.

alanengineer · Post by **alanengineer** » Tue Dec 28, 2010 4:05 pm

How can we tell the difference between a 650 crank and a 600 crank and then is their a difference again in the 500 crank. I thought it was just the throw.

Duncan · Post by **Duncan** » Tue Dec 28, 2010 4:55 pm

Alan, I think you will find that some 600 cranks have a bolt welded to their big end regrinding centres.

alanengineer · Post by **alanengineer** » Tue Dec 28, 2010 5:24 pm

How long are these bolts and can i make them in stainless.
No seriously, im interested. it was supposed to be an intellegent question

Groily · Post by **Groily** » Tue Dec 28, 2010 5:37 pm

AFAIK Alan the 500 and 600 are the same bar the balance factor, the 650 has the longer stroke. So of the three the 650 is the odd man out in visual terms (forgetting about alternators and and all that stuff). Obviously there weren't any 650 cranks back in '56!