New all-motor AM/X class at MIRock-Prelim Rules

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New all-motor AM/X class at MIRock-Prelim Rules

This is a discussion about New all-motor AM/X class at MIRock-Prelim Rules within the MIROCK Series section, where you will MiRock Series Racers Pit Here!!!; 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

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    Default New all-motor AM/X class at MIRock-Prelim Rules

    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:

    540x2.62=1415cc

    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
    sportbikeryder, timhays and mr745 like this.
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    So is this a whole new set of rules

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    Nice job fellas......1640 with any ignition system for me.
    640 lbs baby.
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    When you say stock frame does that mean no modifications? Stock trees?

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    Quote Originally Posted by money maker View Post
    When you say stock frame does that mean no modifications? Stock trees?

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    The exact limitations of the frame have not really been finalized. When I stated stock frame, I was more trying to indicate no chrome-moly aftermarket frames.

    And definitely not stock trees. Aftermarket front ends would be allowed. But I believe that the small-to-average size rider would not really need aftermarket forks, he would be good with stock forks.
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    Quote Originally Posted by money maker View Post
    When you say stock frame does that mean no modifications? Stock trees?

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    With the 2.62 weight factor, a 640lb package could actually be 1676cc. A 1640 only has to weigh 630lbs.
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    Quote Originally Posted by money maker View Post
    So is this a whole new set of rules

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    I am not sure what you mean by that. There has never been a class exactly like this before, and MIRock has certainly never done anything like it. So it can only be a new set of rules.
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    i think he is referring to the class lil rich has been talking about

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    Quote Originally Posted by Jr0589 View Post
    i think he is referring to the class lil rich has been talking about
    Thats right

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    No oversized ti valves would keep carpenters $6500 head out

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    Cough Cough , what that mean for 1000's? just wondering cause i wanna fight with my possum bike . dont need a busa for that so where does the rules play with that motor ?
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    Ok back to my drawing board. That's a little different but so far seems very doable.
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    It is the same basic class that Richard is discussing, but there are some minor differences based on our knowledge and abilities when it comes to tech and rules-making. The end result is something very, very similar to Richard, but not exactly the same.
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    Quote Originally Posted by $POSSUM$53 View Post
    Cough Cough , what that mean for 1000's? just wondering cause i wanna fight with my possum bike . dont need a busa for that so where does the rules play with that motor ?
    How much does the combo weigh? Multiply that by 2.62...

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    so are we moving this discussion to over here?

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