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Post by andr01dm on Oct 24, 2008 18:34:35 GMT -5
I've received my carb springs from Ron Ayers and wanted to make certain that I'm cutting 'em in the right place. Below is a photo of one with a pair of scissor graphics indicating where I believe I'm supposed to cut them to make a 1 coil clip and a 1.5 coil clip springs.  Is this correct..? (ps: It's a little hard to see where the end of the spring is, so I added a yellow center-line.) |
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Post by Dandy Dan on Oct 24, 2008 20:34:21 GMT -5
Wow great diagram! Those cuts look right to me to shorten the spring by 1 and 1.5 coils.
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Post by yaris on Oct 24, 2008 22:23:00 GMT -5
I have a question: why do you cut the spring? is it juste because you don't have the proper model for the ruck or is it a kind of tuning?
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Post by Dandy Dan on Oct 25, 2008 1:31:03 GMT -5
It's a tuning thing.....some people swear by it but I've never noticed much of a difference.
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Post by jedisabre7 on Oct 25, 2008 8:58:34 GMT -5
what exactly does cutting the spring do for performance?
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Post by jedisabre7 on Oct 25, 2008 8:59:05 GMT -5
does it keep it richer on decel for a short time>?
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Post by Dandy Dan on Oct 25, 2008 11:59:04 GMT -5
The carb slide (the part that opens the main jet and the main air passage as it rises) is raised when the vacuum in the carb is strong enough to compress this spring. Basically, as you clip this spring it gets weaker, so as you twist the throttle open the engine will react a bit faster. Unlike early slide carbs, when you crank open the throttle you aren't actually cranking open the carb. You're simply cranking open a butterfly valve in the carb that allows the main carb slide to start rising as the vacuum builds. So there is always a bit of a delay, but this delay is sort of a good thing because if you actually went to WOT really quick your engine would stumble a bit as the mix wouldn't be quite right (due to air velocities etc). So basically, you're getting a bit faster throttle response with this mod. I think that's how it works but maybe I'm way off and Chanito can correct me.
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Post by andr01dm on Oct 25, 2008 17:59:38 GMT -5
Wow great diagram! Those cuts look right to me to shorten the spring by 1 and 1.5 coils. Thank you. ^_^ |
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Post by Damocles on Sept 6, 2018 18:51:05 GMT -5
Cutting a spring length actually makes the spring stiffer. Cutting a carb spring changes the OFFSET of the spring, that is, the slide travels farther before the spring force is applied; this "free play" may be confused with the incorrect notion that cutting a spring weakens it. Truth is: More force is required to displace a shortened spring than a longer one, all else being equal.
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