Flywheel machining

[idc1967iow]

If get a machine shop to lighten a flywheel will it need balancing after?

Cheers Ian

[dapper]

It would be worth doing to cut down on vibrations and stress on the crank.

[camel]

machine it on a crank held in a lathe and centres all running true,probably as good as your going to get...thats how i do mine
how can you balance a flywheel?

[ducksta]

what scoot

[dapper]

how can you balance a flywheel?[/quote]

Well, they obviously do 'cus there's lost of little holes drill together on some flywheels where they remove weight to balance 'em.

[Grumpy225]

machine it on a crank held in a lathe and centres all running true,probably as good as your going to get...thats how i do mine
how can you balance a flywheel?

It's a specialist job where they spin the flywheel at some high speed and detect where the inbalance factor on it is. Kinda lika balancing a wheel but more high tech.

When I had all the fins shaved off an AF flywheel I had to have it rebalanced. My machinest made a special mandrel to match the taper of it and the balance shop did their magic on it. When it came back there were new holes in it for balancing.

[camel]

sounds easy
balancing flywheels is obviously more common than i thought!

[oggy]

Hi,made a ss cover for my cowling,but the fixings inside the cowling foul the flywheel,there 5mm nylocs,can i have that much machined of safely without a cooling issue,thanks.

[Ihateyoubutler]

In my humble opinion, balancing anything that rotates is only ever going to cause less axial or radial movement at certain rotational speeds (vibration). To "balance" a flywheel, and to be effective across the total rev range of even a standard Lambretta engine, never mind the increased rev range of a tuned engine, might be difficult to achieve. What I'm suggesting is that it will only be "balanced", ie causing less vibration, within a specific rev range anyway. If a flywheel is machined to run smooth at, say 5000 rpm, it doesn't mean it will do at 3000 rpm. Maybe a flywheel should be machined so the engine run as smoothly as possible at the constant speed the engine is generally run at, but in this country and on our roads would this be possible?

[idc1967iow]

Interesting