2016 CMC Rules

[Supercharged111]

I threw this up on the CMC forum.

http://www.camaromustangchallenge.co...?p=41277#41277

I never ran this by Al, just throwing it up here as I've busted the 1 Oct deadline and it may be too late. We have tolerances for fuel pressure and ignition timing, I think we need to specify our tolerance for restrictor plates but I don't know what's reasonable.

3.11.1 Fuel Pressure Tolerance shall be +/- 2psi for EFI cars. Carbureted cars are not subject to a fuel
pressure tolerance.
3.11.2 Timing tolerance shall be +/- 1 degree

What do you guys think?

[GlennCMC70]

There is a rule about a tolerance for all measurement not otherwise specified.

[Supercharged111]

Geez, it was directly before my quoted text.

3.11 Tolerances
Unless otherwise specified, all published measurements infer a tolerance of +/- one-half of the last specified
decimal place. All rounding will be done to the nearest decimal place that is specified in these rules. In a
case where a measurement falls exactly on the halfway mark it shall be rounded up or down in favor of the
competitor.

So if a competitor specifies that he is running a 40mm restrictor plate, it must be 39.5-40.5mm?

7.21.4 All Cars may install a restrictor between the air filter and intake manifold to reduce horsepower and
torque. The diameter and thickness of the restrictor plate orifice(s) shall be noted on the Dyno Sheet and
must match at all times. Carbureted cars may install a mechanical throttle stop on the carburetor linkage for
the same purpose. Throttle stop dimensions must be noted on the Dyno Sheet for inspection purposes and
must match at all times.

Below from the dyno sheet:

Restrictor size, # of orifices, diameters, thickness:

So the rules don't specify how accurately the restrictor plate's diameter must be annotated on the dyno sheet. Is what I said above accurate and sufficient?

[Al Fernandez]

I'd say so, especially given that when I was having restrictors made they were in 1mm increments.