Inexpensive RPM control for your engine. When I installed the 5,800 RPM limiter in my bus it increased head life by 50% because it kept me (and others) from floating the valves in 1st gear without realizing it. Many engine builders will install these and seal the distributor on a high performance engine until the warranty has run out. These are stock in Porsches from the factory. When you over rev the engine it shorts out the rotor to the shaft and shuts the spark off to the engine until the RPM is reduced below that speed at which time all of the spark is again delivered to the engine |