str8dum said:Hey guys,
does the delta clutch have more holding power than a polini 2G. I need to get a new clutch and want minimum clutch slip at my takeoff at ~7500 rpms. I have a 2G now, but now is the time to switch if the delta is better.
Thanks!
roost said:I think Malossi clutches are crap. They will self-damage if you use hard springs (black, blue).
However I use the delta clutch, have removed the weights and run very soft springs (white) on my racing zip. That gave me some incredible take-offs.
Next clutch I will buy is the polini 3g.
roost said:I think Malossi clutches are crap. They will self-damage if you use hard springs (black, blue).
However I use the delta clutch, have removed the weights and run very soft springs (white) on my racing zip. That gave me some incredible take-offs.
Next clutch I will buy is the polini 3g.
tiba_karotsu said:delta clutch is not that heavy in fact it's just the right weight ''coz if clutch is too light it'll have less thrust to push the lining against the clutch bell & that leads to excessive clutch slippage. use the malossi clutch bells along with the delta clutch they work better as a combination.
Browni said:maybe you are right but not 100%
At 10k or more RPM the light clutch has enough centrifugal force too!!
If you use springs that are too hard, it will engage the clutch at lower (engine)rpm than needed. In fact you will get the highest possible engine rpm at take off by using the right springs. If the springs are too soft or too stiff it will engage at lower rpm!Browni said:Really? How can you use the white spring in your race bike? In which rpm it engages?? I hate the Delta too! I removed the masses from the clutch and use a custom made spring (stiffer than the black Malossi) and it is even very bad to me!
roost said:If you use springs that are too hard, it will engage the clutch at lower (engine)rpm than needed. In fact you will get the highest possible engine rpm at take off by using the right springs. If the springs are too soft or too stiff it will engage at lower rpm!
tiba_karotsu said:the light clutch will surely slip excessively & you'll end up with a discolored clutch bell. i have tried the MK 3shoe clutch & clutch bell combo with just a midtuned 90cc acceleration is bad from stand still that i reused the heavy stock clutch & used stiffer clutch springs for it & it worked much better.
Yeah it does.Eoin70 said:hmm but dont the rear pulleys spin at less rpm than the vario on front?
roost said:Browni:
Of course the harder the spring, the more the clutch rpm to engage. But if the springs are too hard, the variator will have to change the ratio of the transmission so it will spin up the rear pulleys enough to make the clutch engage.
If you have lets say the variator set to work at 13000, will you be able to achive higher engine rpm than that at take off? The answer is no.
Just take off the transmittion cover, hold the brake and give full gas, then watch the belt on the rear pulley; how much it does dive into the rear pulley? It shouldn't dive more than 1-2 mm for best results.
About the bending shoes: The malossi clutches have springs on side of the clutch shoes. So over time with hard springs the shoes themselves will became bent towards the clutch plate. Don't know exactly the dynamics of what is happening when the shoes are bent, but they do worsen the take off. It's obvious that much more energy than needed is consumed into friction losses rather than traction.
However I use white springs and no weight. If there is no weight, then there is a need for softer springs. I didn't want to use the hard springs and weights, because I knew it will ruin the clutch.
roost said:Well, there are many approaches.
In my case, it is not that the clutch engages at low engine rpm. But it does in full powerband rpm! At the start of the race my bike is at full engine rpm while the others are slugging with the clutch working and the engine at rpm under the powerband.
At launch the transmission(the belt-pulleys system) should be at the shortest ratio possible, this way the clutch will finish it's work ass soon as possible (the clutch consumes lots of energy at the launch). The clutch will slipp until the bell reaches the same rpm as the clutch.
The most of the point of the ovverrange transmission kits is to reduce the ammount of clutch work needed.
Rollers havent much to do with the launch. What spring? Did you mean (clutch)springs?A really don't know how can your bike start with your spring, do you use 0,1 gr roller weights, cause than I understand why you have full rpm and your variator is stil in the base postion!