Non-linear fuel pressure reg - #2

[Greg Hermann]

>At 02:02 PM 1/10/99 -0700, you wrote:
>>>Just cut my regulator open.  Could I change the spring
>>>to a lighter spring with a faster rate to alter the regulator's
>>>rate rather than messing with the diaphram size?
>>
>>I do not understand how you intend to get a "faster rate" from a "lighter"
>>spring?????
>>
>>A softer rate spring would change the relationship of fuel pressure to
>>reference pressure--shift the line to the left as it were--giving lower
>>fuel pressure relative to a given reference pressure--and vice versa for a
>>stiffer rate spring, but neither would not change the "rate" (slope) of the
>>line. You need a bigger diaphragm to do what you are talking about.
>
>Actually, you can change the rate with a spring...  Look at the "cargo
>coils" sold by Dana for cars... they hav a progressively higher number of
>coils per length near one end... (wound closer together at one end than the
>other) as it's compressed, the rate increases... this way they are able to
>have a low rate when the car is unloaded for comfort, and a higher rate
>when it's loaded to keep it from bottoming out.  Done on a smaller scale it
>could be done for a regulator, but there would be an awful lot of man (or
>woman) hours into researching the proper spring to get the desired effect.
>Later,
>Dave

Even if it were practical to try that, the pressure curve of the resulting
regulator would be pretty strongly dependent on the "characterization" of
its bypass port!

Regards, Greg
>
>===========================================================
>           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
>       I am Pentium of Borg...division is futile...you will be approximated.
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