Got some pinions tonight and I am a happy camper...with a 116 spur a 44 through 48 will fit (this is with a Speed Passion Ultra Sportsman 13.5, your results may vary slightly). No belt rub with the 44, with the 48 the lowest point on the motor is dead level with the bottom of the chassis. Again, with the chassis dremeled to allow the motor to swing down. This gives a FDR range of 4.28 - 4.67. I'm guessing here, but I would bet that a 114/50 would fit as would a 118/42, giving a (theoretical) range of 4.04 - 4.97...almost a full point swing. I think that would cover 93.7% of tracks anyone would race on (barring oval jlfx
). This is all calculated with the low ration option, so the standard 2.125 would be a bit higher FDR all around.
I have to put in a nod here to XRay's spur gears...I have run Kimbrough gears exclusively since racing gold-tub RC-10's converted to pavement oval cars, but the 116 I picked up tonight was XRay and the difference is immediately apparent...so much more precise all around. My "standard" gear mesh was way too loose with the XRay spur...only the tiniest bit of slack is needed and the drivetrain is noticeably quieter and smoother as well. I'm a believer.