Sorry John, but dynamically balancing "on the car" is not possible, as
far as I know. There are two types of balancing: dynamic and static.
Dynamic balancing means the object is mounted on a machine which spins
and, during spinning, electronically measures the forces that are
created by the spinning. The object, nearly always a wheel, is
electronically split in two halves (inner and outer) and the machine
indicates how much counterweight has to be fitted to the inner rim and
the outer rim and where - that's nearly always on different places.
Static balancing is, simplified, mounting the wheel on a frictionless
shaft so that the heaviest point turns downwards. Balancing is then
accomplished by adding a counterweight at the opposite end of the wheel.
Spinning a wheel + drum on a car produces a force which can only be
measured in a vertical plane through the wheel center, so that is static
balancing. But it does take into account possible unbalance in the brake
drum, which dynamic balancing of a wheel alone does not do.
Hope I'm clear - being Dutch I have some problems in trying to find the
correct wording and terminology.
regards
Jack Aeckerlin, The Netherlands
1964 BJ8 29432
John Soderling wrote:
> Alan,
> Two points.
> 1. Most scuttle shake is usually a result of front suspension
> components.
> Therefore, the best single thing you can do is have your wheels and tires
> dynamically balanced "on the car". This not only balances your
> wheels and
> tires, but also your front brake drums too. Of course you have to
> mark the
> wheels if you take them off so you get them back on in the exact same
> relationship with respect to the hub. I have Erika's front tires/wheels
> balanced on the car by my wire wheel expert and at 70 MPH I have less
> steering wheel vibration in my 50 year old Healey than I do in my five
> year
> old Lexus. Really.
> 2. Out of balance drive shaft or bad universal joints can also produce
> scuttle shake.
> Vrooom vrooom,
> John
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