Want a Free Job Posting?

Buy a job posting today and the second one is on us. For a limited time only. Act Now.

Interview Question

Interview(Student Candidate) Gurgaon, Haryana (India)

why the torque curve starts to fall after a certain RPM in

  the torque curve?

Interview Answer

3 Answers


because of less time for air intake.

Interview Candidate on Jun 29, 2012

After certain speed, volumetric efficiency of engine drops down and engine suffocates as required amount of air doesnt enters combustion chamber, hence torque curve drops.

Satyavrat mane on Oct 20, 2012

If a piston moves slowly from top to bottom with the inlet valve open, we would expect the cylinder to be full of charge at atmospheric pressure. This is 100% volumetric efficiency. Unfortunately, as engine speed increases the time available to fill the cylinder reduces. At 6000 rpm the induction stroke takes 1/200 of a second and this affects the volumetric efficiency.

rahul on Nov 19, 2012

Add Answers or Comments

To comment on this, Sign In or Sign Up.