Jack,
As to dynamic balancing on the car, I found this reference: "Automotive
Suspension, Steering and Brakes", by Ellinger and Hathaway, printed
sometime in the 70's or so.
According to them (after static balance is completed, using the same
instrument), "Dynamic balance may be checked and corrected on the
vehicle. The strobe type balance...is used. For dynamic balance the
vibration sensor is positioned against the steering arm or brake splash
shield... In this position it will detect any tendency for the wheel to
turn in or out. The reference mark is again used as it ws for the
static balance. For dynamic balance, one weight is added inside the
front of the wheel at the sensor height and one weight is added 180
degrees from the sensor at the rear of the wheel on the outside. In
dynamic balance, equal-sized weights are always used to maintain static
balance."
I have an old Alemite wheel balancer that can be used as described
above, but the main problem I have had is with the sensitivity of the
sensor which controls the strobe. It has proven too sensitive and is
non-adjustable. Consequently, though I have been able to improve the
static and dynamic balance of the tire/wheel/brake assembly the result
is not as good as I would like. I would think that with an improved
sensing device, and a bit of practice, good results might be achieved.
This type of wheel balancer has all but disappeared in the U.S., with
the introduction of computerized, off-the vehicle, balancers, but I know
that it used to be used extensively in the 40's through 60's.
R. Cobb
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