Technician A says that engines with multi-port fuel injection use plastic intake manifolds to cool the air-fuel mixture. Technician B says that intake runners that are short and large in diameter are designed for peak power at lower engine rpm. Who is correct?

Question

Quizplus · Accepted Answer

Plastic intake manifolds are used for weight reduction and cost efficiency, not specifically for cooling the air-fuel mixture. Short and large diameter intake runners are designed for peak power at higher engine rpm, not lower.

Technician a Says That Engines with Multi-Port Fuel Injection Use