Ron, tremendously sorry but dynamically balancing on the car is
absolutely impossible, unless you change the definition of dynamic
balancing. For dynamic balancing it is imperative to very accurately
measure the various forces trying to tilt the wheel, and that can only
be done when you fit the wheel on a dynamic balancing machine. You have
to realize that a dynamic balancing machine measures the sideways forces
which tend to bring the wheel in a wobbling motion, not only the
vertical force created by the spinning of the wheel. It is the
capability to calculate the exact weights and the exact spots on both
the inner and the outer rim of the wheel that makes the difference
between dynamic and static balancing. A person who claims he can do
dynamic balancing while the wheel is still on the car doesn't know what
he's saying. I've been in the tire business long enough to know what can
be done and what can't be done! If you are looking for the best
solution to a problem you first have the wheel with the tire dynamically
balanced, then fit it to the car and then do a static second balancing
run to eliminated drum unbalance. And if you have the time and the tire
merchant is willing, have the wheel + tire matched. That means you do a
first dynamic run, mark the wheel and the tire and note the suggested
weights, rotate the tire 45 degrees over the wheel, balance again and
note the weights again and so on. After 4 readings you can estimate
which position requires the smallest weights. Fit those weights, mount
the wheel on the car and do the static balancing, and don't show your
face their again for the next few years because the guys there will hate
your guts....
Jack Aeckerlin, The Netherlands
1964 BJ8 29432
Ron Davies wrote:
>"Sorry John, but dynamically balancing "on the car" is not possible, as
>far as I know."
>
>Actually, it is possible but it is very hard to find someone who will do it.
>I've been told that there is someone in Pasadena, CA that does it. It takes
>a lot of phone calls.
>I'm told that that will solve the drum problem UNTIL you rotate the tire or
>take it off to grease the splines. Not many do it because there is little
>need for it.
>Ron Davies
>SoCal
>67 BJ8
>97 DB7
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