RE: Auto Weighing

["Arthur Welch" <ArthurWelch@csi.com>]

Sounds like RuggleS'cales. Check out http://www.tgsi.com/scales.html.

-----Original Message-----
From: owner-ev@listproc.sjsu.edu [mailto:owner-ev@listproc.sjsu.edu]On
Behalf Of David Dymaxion
Sent: Monday, April 30, 2001 4:39 PM
To: ev@listproc.sjsu.edu
Subject: Auto Weighing


 
First right to the question, and then the details: I'd like to weigh
each corner of my car, any suggestions?

I'm about to start wrenching away on my 911. First step is to take
out the motor, figure out what is wrong, and then decide whether to
fix it or electrify it.

Anyway, I'd like to weigh the car, for these fun reasons:

    Weight before and after
    Weight of components as they come off
    Preserve the front/rear balance
    Weight on each tire
    CG before and after

The Porsche has an adjustable suspension, so if the weights on the
wheels are too far mismatched that can be adjusted. Alledgedly this
type of balancing can improve the handling for autocross.

The CG number would be just for bragging rights. The CG should be
lower after conversion to electric if the batteries are kept low. My
idea here is to weigh each corner. Then put the rear wheels on
blocks, and weigh each corner. Then put the front wheels on blocks,
and weight each corner, and then do it side to side. With a little
math, I can calculate the CG.

My cheapest thought to date is something like this:

        tire
==============================================
^                                        scale

You put a strong board on a narrow board or pipe, and hold up the
other end with a bathroom scale. Put the car tire on about the 1/4
point, and the scale will read 1/4 of the weight of that corner of
the car.

I assume "real" scales to do this directly would be expensive, but
I'm open to suggestions. How thick a board would I need? I'd guess
about a 4x8, or is this overkill? I have also thought about using
multiple scales.

The car is not driveable, so no easy drive down to the farmer's
scales. Also, I want to be able to do the weighings while the car is
taken apart.

Thanks for any suggestions.


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