Preparation for the Greatrace involves
several tasks:
1. Paperwork
2. Servicing/Repairing/Checking out the Car
3. Installing/Calibrating the Race Speedometer
4. Developing Performance Data
5. Logistics and Packing
Paperwork
This includes preparing and submitting the application, obtaining sufficient
insurance coverage, submitting information (photos, bios, etc) for the
race program, filling out forms for hotel reservations, etc. And,
oh yes, paying the entrance fee.
Servicing/Repairing/Checking out the
Car
We were fortunate in finding a vehicle that already
was in good mechanical condition. However,
it is highly desirable to make the car as "bullet proof" as
possible to minimize downtime during the race. So
we left it in the capable hands of the staff at the Maxwell Frame Shop
in Belvedere, TN for three weeks to thoroughly check it out mechanically
and complete some additional restoration. Owner
Robert Ralph Morris and top Chevy mechanic Ed Anderson specialize in
restoration work for 1955-57 Chevys and we trusted them to get us "race-ready".
Some
of the work included new brakes, universal joints, engine mounts and
wheels. Fortunately,
they discovered that all the wheels had been damaged and required replacing.
Unfortunately,
finding and reconditioning new ones quickly was not so easy but they
managed! Finally,
the Greatrace regulations require that certain safety equipment be installed
and operational. For
example, turn signals and seat belts.
Installing/Calibrating the Race Speedometer
Stock speedometers are not nearly accurate enough
to use for the precise speed control necessary for this rally. Most
competitors rely on the highly accurate Timewise electronic analog-display
unit developed especially for this competition. Our
good friend, Bob Mead, loaned us his unit for this race but we still
had to install and calibrate it for the Chevy. Installation
involves mounting the display unit in a visible location, cementing
magnets to the driveshaft, and mounting the magnetic sensor unit near
the magnets to pick up the pulses. Our
friends at the Belvedere shop helped with the mountings. Calibration
requires precisely measuring the distance the vehicle moves per each
driveshaft rotation to make initial settings, then road testing through
a measured mile many times to fine tune the calibration. The
Timewise is accurate to plus or minus .0125 mph.

Developing Performance Data
After speedometer calibration, we are ready to
develop our performance data. During
the race, all speed changes are assumed to take place instantaneously.
Since
the laws of physics will not permit this, we have to determine how much
time is lost during decelerations and accelerations and make adjustments
for these losses. We
do this by laying out a very accurately measured mile on a deserted
road, and then making multiple passes at various speeds and combinations
of acceleration and deceleration until we gather enough data to prepare
our performance charts. These
are in the form of matrixes which indicate losses during all combinations
from 0 to 50 mph. Knowing
the number of seconds lost in accelerating from 0 to a specified 35
mph, for example, allows us to make up the loss by running in excess
of 35 for a calculated period of time.
Logistics and Packing
Finding repair parts and maintenance items for
these old vehicles is often a challenge and it is prudent to accumulate
and carry a good supply of the most difficult to obtain. In
our case, Robert Morris was our Good Samaritan who helped us put together
our cache of goodies to take on the rally. We
did not take the extreme measure, as some teams do, to carry spare engines
and transmissions. Our
support crew, the Stumbs, will haul our service supplies. And,
of course, there is always the challenge of deciding what our 15-day
wardrobe should be! Specialty
items include the team T-shirt.

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