Originally Posted by nefastseven
i don't understand why there is those flyweights
i drilled 2 holes in the original flyweights........and i have less weight than this optional part
The reason for the weights is a response to a demand from users regarding the 960 (and 950) on clutch engagement. The request isn't new but when Serpent brings out a part they've got to make sure it's a part that 1) works, 2) brings positive improvement to those who use it, and 3) usually goes a bit beyond some hacked together improvised part.
The debate over flyweights goes back some time. I first heard about this topic almost 2 years ago with the 710 and it probably goes back way before that. The idea here is that by making the weights lighter, the engine needs to spin to a faster speed to give equal momentum to the weights. In other words, for light weights to have the same pushing power as heavier weights you need to spin them faster. So instead of the engine reaching 20,000 RPM before pushing the Centax Thrust Washer, it now mush reach 23,000 RPM (these are made-up examples, not actual data). So when the shoe hits the clutch bell it's going a lot faster and the car has a much more aggressive acceleration.
Light weights can also give you a bit more response. Once in motion, weights carry some momentum. A little throttle may be all that is required to get the weights to move the thrust washer forward. This is done so with less push but done faster than with heavier weights. Some drivers like this 'more connected' feel.
Members of the Serpent crew have made comments on flyweights in the past and my impression was they believed that controlling the tension on the coilspring gave you the same effect plus unhinging the flyweights made them susceptable to being ejected from the clutch assembly in a severe crash (I've seen this happen with the MRX-4). This may have lead to a resistance to change a design Serpent has stuck with for a very long time.
What has changed is the nature of the Internet and how lead users now contribute to the development of a product. Serpent can't afford to hire dozens of test drivers to test drive the 960 for 1000's of hours. The Internet offers a way for lead users to contribute to future Serpent products by giving feedback. Serpent, in the last 2 years, has become a lot more customer focused. Of course they don't take every suggestion but when they see experienced racers repeatedly praising a tip/suggestion/modification, you can be sure they consider it seriously.
Anyway, these things are cheap. The best way to understand anything is to give it a try yourself. You've got your own homemade set so it looks like you understand it but Serpent has made this part for this purpose and used a different material. This is going to save a lot racers a lot of time drilling holes and cutting down existing weights. It's nice to see it come out as an option part.
I'm going to order a set and give 'em a try. Thanks to Serpent and all those who have made suggestions to make the 960 even better.