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spring/weight changes = ? rmps - doing what will give what rpms started by scumpman
February 19th 2008 at 12:38 AM
 
scumpmanRed Ribbon
temporarily out of order
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467 Posts
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Member Since: October 12th 2004
Location: SAINT MARYS, AK, USA
Current Sled: '03 Indy 500
Miles Last Season: ~ 1150 ?
Miles This Season: bout 800
 
 
Hey all, so I'm traveling now and can't ride until I get back home on Friday and I'm getting a little bored and was just wondering???

Is there a hypothetical rule-of-thumb of how much RPM's change when you change the weights or the spring of the driven clutch??? I know that changing the spring hole on the secondary will give roughly 200-500 rpms either way, but this affects backshifting.

Take my set up for example, I'm running a P-85 with a Polaris gold spring and Polaris 10M5 weights - say I wanted to increase my WOT RPM's, I know I should either increase the spring rate or drop grams on the weights. If I wanted to drop RPM's I would need to drop spring rate or increase grams. How much of a change in RPM's would I see if I increased/decreased weights or increased/decreased spring rates??

I'm wondering if there is a rough estimate increase/decrease in RPMs per gram change or shift rate change; like one gram would be about 1000 rpms or something like that.

By the way, Happy Presidents Day...hope those that had the day off got to ride a bit, I know I didn't cause I had to work today.



'03 Indy 500 sks (Scumpman's Kicka** Snowmachine) extended skid/track to 136" from TracksUSA, AC roller clutch, Holtzman Tempaflow, clutched and geared, 2" risers, skidplate, old Pol rack.

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February 19th 2008 at 7:54 AM
 
xcr440 Gold Ribbon
wood butcher
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Member Since: February 1st 2003
Location: St.Germain/Edgerton, Wisconsin, USA
Current Sled: 03prox700/97xcr440
Miles Last Season: 864
Miles This Season: 1600
 
 
Really is no set amount of rpm's. As you can get weights that weigh the same but have different shift charistics. You can also get weights that have more weight on the heel or toe.

Easiest thing is to get the parts and test, always test aginst anotheer sled that is unchanged.

On my prox 700 I went from 64-66's. It was a 3.8 gram difference, I weighed them all. I dropped 300 rpm's but I also upped the spring rate on my secondary spring. Since it was slipping.

It all must work together.



Triples are like fat chicks, When you ride one your friends make fun of ya, but they give you a hell of a ride like its thier last.

2003 Pro x 700
1997 xcr440
1998 Indy 500
1987 Indy sport

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