Tech gurus By twowheeler (Read 829 times)

[twowheeler]

I know what a contra does. What i dont understand is how it correlates to rpms...

Ok so ive been riding my clutch for 2000 miles and runs fine and rpms are between 7200-8000

I put in a brand new one with a stiffer contra and it runs like a bat out of hell.....but the rpms went up too and went up too high. So I could go to a heavier slider right?

What in the heck is the difference between running a stock contra with 5gr sliders and running a stiffer spring and 6 gr sliders just to get back to the same rpm range? Wont it basically perform the same? Isnmt the aceleration based on the pwerband of the rpms regardless of the spring ? I could run 4gr sliders in the stock clutch and have the same result ...great aceleration but high rpms.

So if theres 2 identical scoots, same weight and everything, one has 5gr sliders in a stock variator and the other has 6gr sliders with a 1000 or a 1500 contra.....whos gona get up to crusing speed quicker?

[tvnacman]

interesting get a buddy and a stop watch let us know .

John

[rapidjim]

I don't rememeber where I found this, but I had saved it because it offers some good info

1K is good for a torque spring on a street bike. 1.5K is good if you have steep hills/mountains to deal with. 2K is only useful on a race bike. As you go heavier, the belt is pulled down sooner when you add torque to the rear wheel (as in going up hill). The CVT is balancing the torque of the rear wheel resistance against the torque the engine is producing, so with a heavy spring you get pulled back sooner off the throttle too. This means a the heavier the torque spring, the more throttle you have to give to maintain speed even down hill (2K is like always being in 1st gear). Also keep in mind the the stronger torque spring you have the heavier variator weights you need to maintain your rpm constant, which puts more stress on the belt so you better also use Aramid cord or Kevlar. Stock to 1K makes the best riding experience for most on the road.

AFA clutch springs, yes but it's approximate and not the engine rpm. At idle your engine is running several times the rpm as the clutch. Where a stock clutch will engage at around 3000-3500 rpm, a 2000 clutch spring may not engage until over 5000 rpm; coupled with a performance clutch pads and bell, you may find yourself often popping the front wheel off the ground even when you don't want to. Again, I only see 2000 clutch springs useful on a racing (or wheelie) bike.

The variator weights control what is called the "constant engine speed". I'm sure you've noticed when you give your scoot full throttle it holds a certain engine speed while the vehicle accelerates. The variator controls this engine speed. If your engine is above it's maximum torque because of too light of of weight, it will not accelerate like it could. If your engine is below it's maximium torque because of too heavy of weight, it also will not accelerate well as it will bog. So, this being said, you can actually gain top speed AND acceleration by lightening the rollers. This is true for a number of reasons. Your engine has a certain engine speed, RPM, that is it's most powerful and most efficient, this is called the torque peak. You cannot get maximum performance without being at this RPM. Second, remember that the variator get to it's maximum contraction almost immediately upon acceleration, and holds there, it's the rear pulley that slowly contracts as rear wheel speed increase, therby increasing the ratio between engine and wheel, making for more road speed.
To conclude and simplify: lighter rollers increase the "constant engine speed", and heavier rollers decrease it.

[twowheeler]

Good deal. Sounds logical

[Bashan]

Thanks Jim, very nice mini-tutorial. Do you find as the years wear on you're less rapid? Or does the rapid refer to white water sports?

TW and everybody under the rank of Robotic Weinie, which is nobody, should read this section on Kid N Me. Tom is a very dedicated motor sports dealer who never has time to come over and say hey on Scooter Doc and I guess we understand but hey he could just.......um, hi, never mind. But do read the link TW, and put your eyeballs back in your skull, you are disgusting. She's fine, you are a reprobate. Slow the piston up too, clean your room, turn the TV down! My son is coming to visit next week and I'm trying to get back in practice. Really TW, those are the only shoes you have now? Sigh.

[tvnacman]

But Rich she has nice hair !!!!! in his signature photo .

John

[Bashan]

Oh snap John......good grief. You grossed me out, do you know what that takes? The last time was in 2008 when Sue's aunt Oldie walked out of the bathroom with no clothes on. Even then it was a tough call, 10 pounds less of cellulite....who knows? We stay in touch, e-mails, letters, videos, missives, cryptograms, rebus, CDs, sigh. Rich

[twowheeler]

Nice hair? Have you ever heard of a bikini wax?

[cyborg]

so if i get heavier weights and set up a 20 shot of nitros,,,i should see a marked increase in acceleration ,,,,if the head stays on the thing,,, theoretically speaking of course

[Bashan]

Yeah, I think nitros might have an influence. We had a Viper for a few years. I put a free flow exhaust on it. It made a huge difference. Supposedly took it from 450 to 500 HP. A guy at a truck stop once said "I got nitro and I can kick that things arse!" I said "only as long as the nitro lasts, then, this sled does 195 as long as the gas holds out. Er....about 4 MPG at 195. I sold it when a set of tires was coming up and it was $2K!. I found it, it was this one:

It was raw, noisy, uncomfortable, scary, demanding, sometimes horrible, always a rush.

[cyborg]

that girl shaves,,,,,,,, BABY!!!!!!!!!,,,i got me one just like her but blond,,,she shaves too

[cyborg]

Mar 11, 2014 15:13:34 GMT -6 Bashan said:

Thanks Jim, very nice mini-tutorial. Do you find as the years wear on you're less rapid? Or does the rapid refer to white water sports?

TW and everybody under the rank of Robotic Weinie, which is nobody, ,,,HEY!!! i resemble that remark!!!!!!

[twowheeler]

At least she calls me robotic weenie

[tvnacman]

Mar 11, 2014 17:06:42 GMT -6 twowheeler said:

Nice hair? Have you ever heard of a bikini wax?

Does that help in sliding the bottoms off ?

John

[Bashan]

Def: bikini wax, a substance that facilitates the removal of female swimwear but providing lubrication of the inner lining of the garment against the female's skin. Used by Robotic Weinies, crazed electricians, bug eyed scooterists, and other miscreants.