Rollers VS Contra By blueboy5000 (Read 791 times)

[blueboy5000]

On scooter site, a recent idiotic debate ensues about rollers and contra springs.

The prevailing misconception is that lighter rollers or a higher rpm contraspring produce the same result in regards to acceleration.

Having repaired and replaced many CVTs, I call complete BS on this.

Roller weights affect the amount of rpms an engine can produce. Contra springs affect the rate at which the rear wheel engages.

Seeings how weights and contrasprings have totally different functions, I do not see how a higher RPM contraspring allows for increased engine RPMs, probably because that is totally not how it works.

The "pups" (namely Fox) have chastised me for stating my observation. An observation based upon real world observation of many CVTs.

I hearby state that changing to lower weights is NOT the same effect as increasing (or lowering) contraspring rates.

I'm at a bit of a loss to 1) how this is even debatable, since watching a CVT in action pretty much vindicates my opinion 2) why anyone would make such an enerous statement and then go out of their way to argue with me about it.

I miss when scooters were about riding them and giving correct information.

[JR]

scootdawg.proboards.com/index.cgi?board=talk&action=display&thread=51237

Your assessment is right on Blueboy and as far as Fox IMO just like a lot of people there, blind leading the blind!


Seeings how weights and contrasprings have totally different functions, I do not see how a higher RPM contraspring allows for increased engine RPMs, probably because that is totally not how it works.


Actually it can lower RPM's in some cases IMO. I live at the bottom of Petit Jean Mt. and it's 1-/34 miles to the top and it rises nearly 900 ft in that span.

I actully took the 1000 RPM spring out and went back to the OEM spring which from what I've read is possibly in the 750 RPM range, no one knows for sure.

I've got a tiny tach and I dropped the weights on my stepson's 150 Bali to 11g and when I went back to the OEM spring by our tests we gained about 200 RPM and with his 165lb body on it about 4 MPH top end pulling the mountain. But this is pulling one hell of a hill.

My theory is lower RPM spring needs less HP to keep it engaged in low gear range thus putting more HP to the rear wheel and thus more MPH.

I'm going to go to a 842 belt and 11g sliders and that should give the scooter the best of both worlds good pulling power and a tad of top end.

IMO higher RPM springs are for racing only and a waste of time and money for everyday riding and in fact cost you MPG and engine longevity by making the engine need more RPM's to engage.

We all know that the two main enemies of this engine is heat and RPM's.
JR