Re: Auto Weighing

["Rich Weiss" <RichHeidi@TechHeadNet.com>]

2x8 should suffice, keep short lever at a foot or less

rich


----- Original Message ----- 
From: "David Dymaxion" <david_dymaxion@yahoo.com>
To: <ev@listproc.sjsu.edu>
Sent: Monday, April 30, 2001 3:38 PM
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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