A-Speed

Resources

Practical guides for Model A owners—setup, touring, and getting the most from A-Speed on the road.

Timing the Model A Ford Engine

Set basic Model A ignition timing with the timing pin, point gap, and distributor cam adjustment.

Identify your Model A rear-end ratio with a simple crank pulley rolling test—no differential teardown required.

Learn why vintage speedometers drift and how to test yours against GPS for honest touring speeds.

Understand the math behind MPH, tire size, and rear-end ratio—and see example RPM figures for real Model A setups.

Learn how overdrive affects RPM, cruising speed, and drivability—and how common Mitchell, Borg-Warner, RTS, and T5 conversions fit touring builds.

Measure tire diameter the right way—direct and rolling methods, wear considerations, and why accurate sizing matters for A-Speed RPM on tour.