EFFECTS OF VALVE EVENTS ON ENGINE OPERATION.

Abstract

The modern spark ignition automotive engine, though fundamentally similar to those having diverse nonautomotive applications, is distinct with respect to many details. The distinct features of automotive engines reflect characteristics of their duty cycle which impose a unique set of design constraints. It is within the realm of these design constraints that this treatment of the subject of valve events is based. Throughout this discussion the term 'valve event' denotes the creation of flow area in a phased relationship with piston motion through which the gas exchange process is conducted.