Which Rev Limiter Works with my Ignition System?

A traditional “single coil and distributor” ignition system will work with an Omex Rev Limiter. To achieve this both rev limiter coil negative wires need to be connected to the coil’s coil negative terminal.

Note that some race ignition systems use a “CDI” ignition amplifier. Omex Rev Limiters are NOT compatible with CDI ignition.

These units have the ignition coil inbuilt, often with an ignition amplifier inside too. A rev limiter is suitable but you need to get the wiring inside to the ignition coil. This normally involves removing the distributor cap, rotor arm and flash plate, taking the wire into the unit with its other wires, and then connecting directly onto the ignition coil before rebuilding the unit. This is not a difficult job but does require some mechanical knowledge and simple tools. Both rev limiter coil negative wires will need to be connected to the coil’s coil negative terminal for this to work.

These are typically a single pack containing two double-ended coils with 4 HT leads coming directly from it.

Some  engines  have  wasted  spark  coil  packs  that  look  like  4  individual  coils,  but  are  still  two  double ended coils. Examples are some Rover K Series and some small Peugeot engines;

The coil must be non-amplified. You can test this by measuring with a multimeter (resistance setting). Between the 12V terminal and one of the signal terminals (also known as coil negative) a non-amplified coil will measure approximately 1Ω. An amplified coil pack will measure many thousands of ohms (kΩ). An Omex Rev Limiter is only suitable for non-amplified coil packs.

Coil-per-plug can be either 4 fully individual ignition coils;

Or can be 4 ignition coils in one unit;

Omex Rev Limiters are NOT suitable for these ignition coil types.

Some engines (particularly some Alfa Romeo engines) have 2 spark plugs per cylinder. Omex Rev Limiters are NOT compatible with ignition systems.

Coil-per-Plug

A traditional “single coil and distributor” ignition system will work with an Omex Rev Limiter. To achieve this both rev limiter coil negative wires need to be connected to the coil’s coil negative terminal.

Note that some race ignition systems use a “CDI” ignition amplifier. Omex Rev Limiters are NOT compatible with CDI ignition.

No other ignition system type is compatible for 6 cylinder engines.

A traditional “single coil and distributor” ignition system will work with an Omex Rev Limiter. To achieve this both rev limiter coil negative wires need to be connected to the coil’s coil negative terminal.

Note that some race ignition systems use a “CDI” ignition amplifier. Omex Rev Limiters are NOT compatible with CDI ignition.

No other ignition system type is compatible for 8 cylinder engines.

Some amplified wasted-spark ignition coils have the amplifier built onto them externally;

Due to the amplifier the Rev Limiter cannot be connected directly to the vehicle wiring. However it is possible to remove the amplifier to gain access to the true coil negatives;

And then reinstall the amplifier after the rev limiter trigger wires are connected to the coil negatives.

This is a fairly complex fitting and will involve modification of the coil to allow the wires to be added so should only be attempted by an appropriately experienced auto electrician.

Magneto and CD ignition systems are NOT compatible.

“Positive earth” vehicles are NOT compatible.

Rotary engines are NOT compatible.

Diesel engines are NOT compatible