Anyone got a 500 twin crank in pieces?

P

Peteyoung75

VIP MEMBER
Joined
Oct 5, 2024
Messages
25
Country flag
…….if so, would you be able to measure the diameter of the oilways inside the crank pins? Should be either 1”, 7/8” or 5/8”. Would be good to know if it’s a dynamo crank, alternator crank, SS crank….
I’m discussing the oilways diameters with the NOC who I think might have incorrect info in the dominator service notes.
Thanks!
 
Peteyoung75 said:
…….if so, would you be able to measure the diameter of the oilways inside the crank pins? Should be either 1”, 7/8” or 5/8”. Would be good to know if it’s a dynamo crank, alternator crank, SS crank….
I’m discussing the oilways diameters with the NOC who I think might have incorrect info in the dominator service notes.
Thanks!
Click to expand...
Anyone got a 500 twin crank in pieces?


Anyone got a 500 twin crank in pieces?


SS sludge trap at 5/8".

I've got at least a dynamo crank around, and maybe a non-SS alternator crank, but not sure about the latter. If nobody else has anything, I'll dig it what I've got over the next couple days.

I'd be surprised if the fellows at the NOC have incorrect crank dims, but happy to help whichever way it goes.
 
t ingermanson said:
View attachment 121620

View attachment 121621

SS sludge trap at 5/8".

I've got at least a dynamo crank around, and maybe a non-SS alternator crank, but not sure about the latter. If nobody else has anything, I'll dig it what I've got over the next couple days.

I'd be surprised if the fellows at the NOC have incorrect crank dims, but happy to help whichever way it goes.
Click to expand...
That’s awesome 👍
 
Peteyoung75 said:
Don’t want to sell it do you??? 🤣
Click to expand...
HA! No. Very lucky to have this one. I got two that are NOS from the Berliner (US Importer) warranty replacement stock. Sold one already. The only way I'd sell it would be to afford to replace it with an aftermarket crank, which would be a counterproductive price for you. It might be worth it to some rivet counter who will sleep better at night with a genuine crank in their genuine motor, but for us mongrel builders, an aftermarket crank with big journals would be better.
 
t ingermanson said:
HA! No. Very lucky to have this one. I got two that are NOS from the Berliner (US Importer) warranty replacement stock. Sold one already. The only way I'd sell it would be to afford to replace it with an aftermarket crank, which would be a counterproductive price for you. It might be worth it to some rivet counter who will sleep better at night with a genuine crank in their genuine motor, but for us mongrel builders, an aftermarket crank with big journals would be better.
Click to expand...
What a score!
 
Is the crankshaft for a road bike or a racer ? If it is for a racer, a billet crankshaft might ultimately work out to be cheaper.
 
Peteyoung75 said:
…….if so, would you be able to measure the diameter of the oilways inside the crank pins? Should be either 1”, 7/8” or 5/8”. Would be good to know if it’s a dynamo crank, alternator crank, SS crank….
I’m discussing the oilways diameters with the NOC who I think might have incorrect info in the dominator service notes.
Thanks!
Click to expand...
The dynamo crack from my long suffering 88 race motor has a 1” dia oilway.
 
t ingermanson said:
Yep!
View attachment 121633

Remarkable how much better finished the dynamo crank is than the SS. Very smooth trap, taper, and face finishes. Probably using the same tooling 10 years apart!
Click to expand...
The dynamo and early alternator engines were built in the Norton factory in Birmingham, but AMC had a lot of spare capacity in Woolwich due to declining sales of outdated AJS & Matchless models, so shut the Norton factory and moved production to Woolwich but not most of the workers (who new how to get the best out of the old machines & tooling).
It would be interesting to see how the ss cranks compared, before and after the move.
 

Similar threads

P
500 twin cranks
2
Replies
32
Views
1,387
Fast Eddie
Fast Eddie
Back
Top