Originally the softer slide spring or tied spring idea was suggested by Terry
Hayden as a way to improve throttle response from lower rpm ranges. I suppose
the theory is both extra air and fuel as the throttle is opened to say 1/2 way
or more. I can only assume that with a better exhaust the extra induction
available can be used by the engine so I gave it a go. It definitely helped the
roll on response a little and created no negatives whatsoever in my opinion.
Others on the list however have suggested that with the tied springs you can
cause the slides to not fully open at full throttle due to the tied coils
creating a wedge to the slide retracting fully This does sound logical and I'm
going to try it at my next trip to the dyno by doing a run with tied springs
versus untied ones. Again, this is only to see if at full throttle the tied
springs are binding the full opening. I will let the list know what I find.
I don't have a Tourmaster, only a stock 1200cc engine.
Sam Blumenstein #795
Gary Rathbun wrote:What is the main purpose of tied (or weaker) diaphragm
springs? Doesn't
> seem like it would change the mixture, because even though the needle
> may be retracted further for a given throttle setting, the air
> passageway is also bigger. So the effect would be like you had the
> throttle open further than you actually do. Thus, "wide open" and
> running on mains would occur at a lower throttle setting; is this
> correct?
>
> Sam, thanks for the info on your setup. Do you have a TourMaster, or is
> this on a stock engine?
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