JL222
Thanks for the info. My concern was that a friend of mine was racing up Piles Peak last year and he had a F1R and at high RPM shifts he blew the transmission in the head unit. For this year he built a belt drive gear system for the transmission. Also Doug Robinson mentioned that he had problems with his hybrid supercharger till he went to a "V" belt.
My F2 is going on a GMC XO motor and still haven't decided to build a gear drive and eliminate the belt on the supercharger or some style of belt. Still investigating the problems, it seems that the shaft in the transmission that the gears ride on is the culprit. Its too small for the high rpm and when you go to shift the shaft flexes throwing the gear alignment off and BOOM. I was reading that the early Miller and Offy blowers had very smiler problems till they devised way to fix it.
I'm not to familiar with the F2 but i believe the gear case is machined from solid billitt as our F3R 139 is, go to page 6 of this build to see comparison between the F3R and one of our D2's. The gear case is way bigger than the D2 and we didn't have problems with the D2's which were machined castings.
How many times are you going to shift on a bville run compared to Pikes peak?
There is a company in Arizona that makes a gear drive that bolts in front of the motor and uses quick change gears [i believe]
that we looked into but we did'nt have enough room for it and it cost 3000$. Procharger has the phone#.
Like bvillercr says they run cogs on their race blowers for a reason.
Doug only runs about 15lbs boost, put in 25 or 30 and make it come alive. After messing with mechanical fuel injection i suggest blowing into a big 4 barrel carb. Their's an engine builder making over 1700 hp with a big chev an F2 -4 Barrel -pump gas and cog belt. Steve Morrison i believe.
Good luck JL222