Yamablue
Member
I think I just had a revelation in clutching and it makes a lot of sense. I hope someone can verify my theory. I think I'm getting an idea how to tune carbs on my sled, but I really still don't know a lot about clutching. I figured out how some different weight profiles backshift and up shift differently, but a helix is something I just knew was there.
OK, now on to the helix. A steeper angle will make the motor pull higher RPMs because it is harder for the clutch to up shift against the spring twist pressure. A shallow angle makes it easier for the belt to drop down in the sheave and up shift. When you have a multi angle helix, you get that nice RPM overrun, the sled takes off then the sheave catches up a little and pulls the RPM down a little, then the shallower angle comes in and it’s like shifting into another gear. Since the motor is making peak or close to peak power, it's easier for the motor to maintain RPM as the primary pulls through though its range and so on.. So my rant goes on. Someone else want to talk about backshift and spring pressure, or correct my deficient thinking? My head hurts now.
Would really appreciate the help in getting the proper thinking down so I make the correct conclusions when I’m out testing. Thanks
OK, now on to the helix. A steeper angle will make the motor pull higher RPMs because it is harder for the clutch to up shift against the spring twist pressure. A shallow angle makes it easier for the belt to drop down in the sheave and up shift. When you have a multi angle helix, you get that nice RPM overrun, the sled takes off then the sheave catches up a little and pulls the RPM down a little, then the shallower angle comes in and it’s like shifting into another gear. Since the motor is making peak or close to peak power, it's easier for the motor to maintain RPM as the primary pulls through though its range and so on.. So my rant goes on. Someone else want to talk about backshift and spring pressure, or correct my deficient thinking? My head hurts now.
Would really appreciate the help in getting the proper thinking down so I make the correct conclusions when I’m out testing. Thanks
You got it bass ackwards. Steeper helix = lower rpm,s due to faster upshift. Shallow helix = more rpm,s cus of slower upshift. Sorry to put the smack down on your clutching revelation!
Yamablue
Member
Damn those people over at snowest. That was how I thought it was when I didn't know what was going on.