Author Topic: Ballast rule  (Read 2284 times)

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May 16, 2018, 03:48:36 PM
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WCMA Tech regs state:
"1. Ballast may be added but must be securely mounted within the coachwork in such a fashion that a tool is required for removal of ballast.
2. Unless superseded by class rules, all ballast shall be solid metal such as steel, and consist of a minimum of five (5) pounds per piece. Each piece should be bolted in place with through-bolts, fender washers, and a locking-nut / system (e.g. jam-nuts, Nylock, etc.). All bolts should be grade five (5). There should be at least one 3/8 diameter, or larger bolt for every ten (10) pounds of weight (e.g. 20 pound block uses two bolts)."

SCCA Spec Miata Rules: "Each (50lb) segment of ballast shall be fastened with a minimum of two (2) one-half (1/2) inch bolts and positive lock nuts of SAE Grade 5/Metric 8.8 or better and shall utilize large diameter, load distributing washers. Alternatively, ballast may be secured using all 4 Mazda factory passenger seat mounting bolt holes."

Which rules are we following??

« Last Edit: May 16, 2018, 07:52:13 PM by MattB »

May 17, 2018, 07:34:54 AM
Reply #1

Spec Volcanic

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Hi Matt,
The Spec Miata rules meets or exceeds the WCMA rules when followed correctly, so please follow Spec Miata the rules which are specific to your class.
Gary Roberts
Race Director

May 17, 2018, 08:13:49 PM
Reply #2


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Matt, I have a 65lb ballast (2 plates) already sized and drilled for the seat mounting holes if you're interested.
Insert awesome race car here.