High-Range Rev Limiter with RPM Switch

The ETC Inc. High-Range Rev Limiter with RPM Switch was designed to be used exclusively by Nostalgia Racers, giving them engine protection as a high-RPM rev limiter and also an RPM Switch for use with a shift light.

This unit is a unique control device that has been designed to work with all Mallory Magnetos. Models are also available for the Vertex standard internal coil and external coil magnetos. Models for other ignition types are available on request.

Adjustable RPM limiting is provided by an adjustable push wheel switch which selects the RPM in increments of 100 from 2,000 to 9,900 RPM causing a switch point when the RPM exceeds the set point.

This product does not short the mag or alter the magneto performance in any way.  It is completely safe with a supercharged engine and will not cause crossfire in the cap or backfire through the intake. This unit has been designed using the newest linear, digital, and power devices. The device weighs only 8 ounces and is small in size at 4.0" x 2.25" x 1.80" with two additional one-inch mounting flanges on each side. It has a mounting plate with holes for grommets and/or DZUS fasteners. It has been designed to operate in the presence of mechanical high electrostatic ignition noise generated by magneto ignition systems.

The RPM Switch operates separately from the RPM limiting and can be set by separate push-wheel switches. The adjustment range is from 2,000 to 9,900 RPM in 100 RPM steps. When the engine RPM exceeds the sat value, a single pole, double throw 20 amp rated relay operates. The relay's normally open (orange wire), common (green wire) and normally closed (gray wire) contacts are available to the user. This arrangement allows the user to use the relay to control any device selected. 

The optional tachometer output is capable of readings of +12,000 RPM. It is an integral part of the signal input of the magneto and will indicate RFI (radio frequency interference) of the ignition system. It is a valuable addition to the rev limiter. We also make two versions. One being a 5-volt square wave output and the other being a 12-volt square wave output for accommodation of variety of tachometers.

The optional burn-out rev limiter to pre-set to your RPM choice. It is actuated by 12-volt input on the brown wire and used to make tire temperatures more consistent for reliable launches.

[click to enlarge diagram]