Roll Yer Own Rollers, Too!

[Wheelman-111]

Greetings:

Waiting almost 3 weeks for 8 and 7g Taiwanese rollers. Slow boat from China apparently, but I've got tuning to do. Keli 9g weights freely pass a 5/32 drill, but 3/8 removes material, so I drilled them. If I knew the density of brass I could calculate the weight of the resultant rollers, but testing shows they are too light. My revs stayed up. Way up, and no upshift from the Keli variator to permit speed to exceed 45 with my new 7.83~:1 gears.

I'm still waiting for the Chinese rollers. I also ordered the OKO Variator for comparison testing.

Will sell one or the other Variator once I determine which works best on Flash.

[scooterwerx]

go to harbor freight. they have a great little digital scale for around 15$. it works excellent for weighing rollers. sometimes even HF surprises me!

[808BMW]

I'm guessing it's the black scale with a flip cover?
I have that exact same HF scale and it's a life saver.

I wouldn't recommend drilling them without a scale. Sure the bit should remove the same amount of material, but if it doesn't (you could angle something a bit a remove too much) then you have 6 unbalanced weights spinning at thousands of rpm.

[burnt_toast]

yes I've bought that scale on sale for $12 and have used it to tune variators every time! also helps for premixin oil

its just a must:
http://www.harborfreight.com/cpi/ctaf/d ... mber=93543

[Wheelman-111]

Greetings:

Sky-high revs this morning - I guess I'm too light. Thanks for the scale tip! HF Here I Come!

I've noticed some tuners use different-weight rollers in the same variator. Even the aftermarket kits supply only 3 of a given weight, so you're supposed to mix, for example 7g and 8g.

But the variator isn't radially symmetric. One pair of ramps is disposed in a tight "crotch just maybe 50 degrees apart. Put it at the top in your mind's eye. The next pair of ramps down from there lies above the "horizontal" by a few degrees. The bottom pair angles out quite a bit more than the top, maybe 70 degrees. Bilaterally symmetrical, but not "balanced".

808BMW said:

I wouldn't recommend drilling them without a scale. Sure the bit should remove the same amount of material, but if it doesn't (you could angle something a bit a remove too much) then you have 6 unbalanced weights spinning at thousands of rpm.

Q1:So how can you balance different-weight rollers? Even 6 rollers of exactly the same weight are not "balanced" because of the ramp angles described above? There's more mass above the "horizontal" than below. I are confused. Is there a scientifical-type-Scooterdude who can enlighten all of us regarding this deep mystery

[Wheelman-111]

Greetings:

I picked up that gram scale tonight. My lightest roller was 6.6. My heaviest was 6.9. Handy little tuning tool, that!. they charged me $20, not the $10 in the ad, however.

[burnt_toast]

Greetings:

I picked up that gram scale tonight. My lightest roller was 6.6. My heaviest was 6.9. Handy little tuning tool, that!. they charged me $20, not the $10 in the ad, however.

Harbor freight secret: print out the ad and take it with you!

you can still do this btw, just take your receipt and show them an online print out of lower price and they will pricematch!

just another reason HF is amazing

[Wheelman-111]

Greetings:

The nice lady at the counter told me that very thing! Also picked up a set of groovy black Laser-etched 1/4" drive Metric sockets. The 3/8" sockets are a clumsy fit for some of the belt cover bolts. Now it's like buttah.

[Kenny_McCormic]

Greetings:

I picked up that gram scale tonight. My lightest roller was 6.6. My heaviest was 6.9. Handy little tuning tool, that!. they charged me $20, not the $10 in the ad, however.

Harbor freight secret: print out the ad and take it with you!

you can still do this btw, just take your receipt and show them an online print out of lower price and they will pricematch!

just another reason HF is amazing

I wish there was a HF nearby