Variable intake manifolds for engines with port fuel injection are being discussed. Technician A says at low speeds, the air travels through a short or large diameter runner. Technician B says they deliver more power at high speed. Who is correct?
A)A only
B)B only
C)both A and B
D)neither A nor B

Question

Quizplus · Accepted Answer

Technician B is correct. Variable intake manifolds use long runners at low speeds to increase torque and short runners at high speeds to increase power.

Variable Intake Manifolds for Engines with Port Fuel Injection Are