Basic Of Automobile Engineering Cp Nakra [verified]

He emphasizes the critical difference: SI engines require a spark at the right time; CI engines auto-ignite due to compression heat.

Why do we need gears? Nakra answers: The engine has a narrow RPM range for peak torque. Gearboxes multiply torque for starting/climbing and reduce engine RPM for cruising. Basic Of Automobile Engineering Cp Nakra