This thread is to begin the preliminary discussions for a set of rules for a new all-motor class at the MIRock series. We have been in discussion for some time, so much that we already have a name: All-Motor Xtreme (AM/X). We have a good idea where we believe the class rules should go, but both Jason and I had so much going on at the end of the season that we could not put enough time and attention to finalize anything until now.
So our thoughts on such a class are that it must fall within these guidelines:
1) It must be kept as affordable as possible. No heads-up racing is ever cheap, but we must keep the price down as much as possible. Slightly slower bikes that provide close racing at a price racers can afford is far better than fast bikes no one can afford.
2) The class must allow a wide range of bikes to be competitive. Busas, Zx14s, liter bikes, and even other makes/model need to be included
3) The class must allow a wide range of riders to be competitive. A class where only flyweights with great clutch hands can win will never stand a chance of surviving.
So with these basic guidelines, we looked at previous classes to see what could be learned from them. After seeing what similar classes have produced for numbers, we have come up with a set of basic rules that should produce 7.70 numbers pretty easily and still be affordable:
Factory frames with 7" slicks, no wheelie bars, and 75" wheelbase
No autos,titanium rods or valve springs. We may consider no aftermarket ti valves either. Factory castings on cases, blocks, heads. Any centrifugal lockup clutch.
Displacement will be based on a weight/displacement factor. It will be selected to where the heavier riders would not need more than about a 1570 to be competitive. Lighter riders could build engines with stock stroke cranks. For example:
If a 200lb rider can build a 600lb bike with a 1572, that is a displacement/weight ratio of 2.62. So if a light rider has a 540lb package, he finds his max engine size by multiplying his weight by the weight factor:
So a 540lb package can have a max displacement of 1415cc. He could also put 10 lbs of ballast on it moving his weight to 550lbs. At 550lbs, the maximum engine size is 1441cc. Liter bikes would probably need a minimum weight of maybe 460lbs no matter what the engine size.
So for a very basic list of the rules, here is a summary to put forth to everyone for discussion:
- Factory Frames
- No titanium rods, valve springs, maybe no aftermarket Ti valves
- Displacement to Weight ratio of 2.62cc/lb
- Absolute minimum weight 460lbs
- No autos
- Carbs or FI allowed
- Any centrifugal clutch
- Push-button start
- Spec Fuel (To be determined later)
- Front & rear Brakes required
- 3" Ground Clearance