Self-Study Programme 195 The 2.3 ltr V5 Engine - Volkspage

Motronic injection and ignition systemOn closer examination it can be seen that the processes taking place inside the twin-path intakemanifold are more complex than at first meet the eye. We will therefore devote this section to explainingthe functional principle of the intake manifold, beginning with its design.DesignIntake manifold upper section withtorque and performance portsThe intake manifold comprises an intakemanifold upper section together with the torqueports, performance ports and rotary valves, andthe intake manifold lower section.In longitudinally and transversely mountedengines the intake manifold is made ofaluminium or plastic respectively.Plastic is the preferred material for transverselymounted engines. This is because the intakemanifold shatters when it collides with the enginecompartment bulkhead in a crash and preventsthe engine from intruding into the passengercompartment.Intake manifoldlowersection195_089Rotary valveThe intake manifold of the V5 engine is based onthe ram pipe charge principle.Was does this mean?The key components of the twin-path intakemanifold are the torque ports and theperformance ports. As their name alreadysuggests, the ports are designed to collectsomething.Indeed, they collect air and produce what isknown as the “self-charging effect“.Torque port195_021Output manifoldThis effect arises from the propagation ofpressure waves or oscillations inside the intakemanifold. The name “ram pipe charging” isderived from this.195_020Intake valveCombustion chamberRotary valve20