hwr
Scoot Member
Posts: 73 
|
Post by hwr on Jul 27, 2018 6:09:20 GMT -5
Howdy all,
-Got my new bike up n running, cast iron polini 70cc AC with durations old mate bell believes will provide peak HP between 10.5k - 11.5k RPM.
-My clutch engages at around 6k RPM which is simply too low to be practicable.
-Im running mystery china +2k clutch springs and have drilled and shaved meat off of the shoes.
-Im looking to achieve an engagement of no less that 8k RPM so when i fit my C20 I can move...haha.
What would you recommend be the next move?
-New clutch springs? who makes really stiff ones for a stock clutch?
-Buy a new clutch? looking to avoid until i absolutely have to
-Recommend me a new clutch or springs cheers
PS Current clutch is 112mm
Thanks legends
|
|
|
|
Post by 90GTVert on Jul 27, 2018 7:08:37 GMT -5
I've never worked with a really nice clutch, so I'll let others advise there.
One tip though; make sure you're getting the belt to the inside of the front pulley and outside of the rear pulley the best you can. That will drive the clutch slower relative to the engine speed. We tend to think about the clutch relative to engine RPM, but in reality it doesn't operate off of engine RPM. It operates on a combination of engine RPM and drive ratio between the front and rear pulleys. If that belt is in a "higher gear" when you're idling, the clutch is rotating faster than it would be if it's on the outer edge of the rear pulley and in the center of the variator. You can think of that just like if you had a manual transmission and you watched the tire spin at idle in first gear or idle in 2nd gear with the wheel off of the ground. That may not get you anywhere, but figured it's good to cover setup basics before buying anything else.
|
|
|
|
Post by harleyracer59 on Jul 27, 2018 7:08:56 GMT -5
unless someone else chimes in with knowledge of some super strong springs, it sounds like you've covered all your bases and already know the answer. lol
one idea on the clutch springs might be to take 1 or 3 springs off (3 would be better so you can see if theyre the same strength). take them to a hardware warehouse like grainger or mc master carr and see if they have a strength or stretch measuring device, or google should show you a diy way with weights and measuring tape to measure the amount the stretch per X amount of weight (im sure their is an industry standard). once you know the length relaxed and their strength, you can search for something stronger. id be interested on those numbers.
some one might know if there is a super spring made by a company.
sounds like youre pushing some power and are getting close to, or you've reached the limits of your stock clutch. every clutch has a max clamping/ grabbing number. you can only only shave and drill so much. but you also have to wonder if your stock clutch is slipping or maintaining at your peak power besides your stall issue.
a performance clutch besides some having adjustable throw/ ratio, being lighter than stock, usually have more clutch pad area then a stock unit.
so with all that said, good luck, happy hunting and be sure to update us with any information you find or a solution as you figure it out.
im one vote for a better clutch altogether.
nick
|
|
|
|
Post by moofus02 on Jul 30, 2018 20:15:39 GMT -5
Overrange transmission will help your problem a lot because it turns the clutch slower to start. As far as clutches a delta clutch is good or a dr pulley hit clutch
|
|
hwr
Scoot Member
Posts: 73
|
Post by hwr on Aug 2, 2018 5:17:28 GMT -5
|
|
