Re: "Blue" wastegate spring

[Robert Myers <rmyers@inetone.net>]

At 02:23 PM 2/23/98 GMT, you wrote:
>C'mon, guys - someone _must_ know what blue colour coding means on a
wastegate 
>spring.

It's impatient for spring?  :-)  Boo-Hiss.

Dunno about the blue color.  If you have a stock spring, you can do some
comparisons.  A subjective evaluation of a stock spring vs. a SuperChips
spring -->  The SuperChips spring is approximately 12 times as "stiff" as
the stock spring.  That may be a clue.

The technique:  Support a known load on the spring and measure the amount
of longitudinal compression from the no load length.  Here, F=kX.  Since
you are using a known, fixed mass, F is constant and k (the force constant)
is inversely proportional to X (the displacement from no load).

Alternatively load the stock spring so that it deflects a measured distance
and then do the same with the other spring to the same measured distance.
The ratio of the loads is now the ratio of the two k values.

Obviously, if the two force constants are equal (or very nearly so) then
the two springs are both stock and they differ simply in the color of paint
applied to them.


___
   Bob
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