Petrol Injection By Simms
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DETAILS of a petrol injection system which is simple and relatively cheap were announced on Wednesday by Simms Motor Units, Ltd. Whereas previous equipment of this type has been reserved for expensive high-performance cars because of its complexity and price, the Simms system, when supplied in large quantities, is to be offered to manufacturers at some £7 more than the cost of conventional carburetters. This, it could be applied equally to cars or petrolengined commercial vehicles.
ft consists of a cam-operated plungertype pump driven from the camshaft gearing and a low-pressure injector which delivers fuel into the inlet manifold. Throttle pedal position provides quantifive control of the fuel injected, and output is modified for engine speed by a centrifugal governor and for load by a diaphragm actuated by manifold depression. A thermostatic control incorporated in the cooling jacket of the engine provides a form of automatic choke for cold starting.
The one pump will suffice for engines of any size, fuel delivery being altered by modification of the pump cam profiles.