OK you guys, now is the time to spill your deepest secrets. A few weekends ago, I ran at Road America at the double regional. I am not completely satisfied with the way my clutches worked. I am running a Polaris P-85 primary and an short tower Arctic Cat roller secondary.
The Arctic Cat secondary has a 44-48 ramp and a green spring. My engine was down on RPM, so I put in some 10-54 weights and the blue Polaris spring. This seemed to get my RPM up to the desired 7800 RPM (494 engine), but I am not getting into the highest drive ratio. Road America likes top speed. I still am not able to get the belt all the way out on the primary, missing full out by about 1/4 to 3/8" and definitely not getting all the way to the bottom of the secondary. I measured the secondary sheave torque and it is about 9 lbs, but according to Miro-Belmont, the green spring is for 700 to 900 CC engines. Other people has said that the side force should not bee a big factor in the opening of the clutch. The belt tension seems about right, about an inch deflection without breaking my thumb. I removed the springs and ran the clutches through the ranges, and nothing is preventing the movement. So come on guys, lets hear it. Richard ________________________________ FormulaCar Magazine - A Proud Supporter of Formula 500 The Official Publication of Junior Formula Car Racing Subscribe Today! www.formulacarmag.com or 519-624-2003 _________________________________ _______________________________________________ F500 mailing list - F500@f500.org To unsubscribe or change options please visit: http://f500.org/mailman/listinfo/f500 *** Please, DO NOT send unsubscribe requests to the mailing list! ***
