Dual-Range Rev Limiter with RPM Swtich

The ETC Inc. Dual-Range Rev Limiter with RPM Switch 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. Other types of ignition 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. Limiting is accomplished by causing a programmed misfire sequence of the engine when the RPM exceeds the set point.

It 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 backfire or crossfire in the cap which causes catastrophic engine damage. This unit has been designed using the newest linear, digital, and power devices. The device weighs only eight 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. This rev limiter has been designed to operate in the presence of mechanical vibrations and high electrostatic ignition noise generated by magneto ignition systems.

The low range is selected by applying +12 volt to the yellow wire (Trans brake output). The low and hi range rev limiting should not be set below 2,000 RPM. The best launch rpm is 200 -300 rpm below your converter stall speed.

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 set value, a single pole, double throw, 20-amp rated relay operates. The relays 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 chosen. (On or off at set point – ground or + voltage power switched).

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.

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