Triumphrat

lovecuba

Completed on a Sunnen DCB-750 operated by an expert.

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Mr.Pete

Interesting that they added 3 gms/cylinder for oil.
The 74% spec from Triumph was with a dry crankshaft.There would certainly be more than 6 gms of oil normally in the sludge trap,probably more than 20 gms.

It looks as though it would have been balanced closer to 65%,when it left the factory.It's not unusual to find that,yet the engines still run smooth.

A higher balance factor decreases vertical imbalance and increases horizontal imbalance,but the imbalance loading on the crank increases.Overall smoothness and comfort to the rider doesn't seem to change.

lovecuba

Understand that. I believed that going this far it would be a good idea to have the crank balanced, not ever having riden the bike (Barn find) I guess I will never know wether or not an improvement has been made.

wolfwolf

I would assume you will be ballancing the rods and pistons also, or that was a waste of time and money?

lovecuba

And I would assume that you read the above attachments?

wolfwolf

I was refering to EACH piston. I see that all parts were weighed and used to ballance the crank, but did you also make each piston and rod weigh the same?
Im not trying to be a smartass here, really just courious.
I usuall just throw the motor together and hope for the best!

loxx101

In a way I wish I had done that now. My engine is heading for a couple of grand now. I guess it'll run amazingly but how much better I'm not really sure!

Would have cost £200 if I had done a basic job on it!

wolfwolf

yep, once you start down the road with the best of everything its hard to draw the line where to stop.
Untill your pockets are empty!
Good luck with the build.

lovecuba

I guess, given that the balance was undertaken by an expert (not Me) the job has been done correctly. Time will tell!