Technician A says that when compressed natural gas (CNG) is used to fuel a modified diesel engine, a means of igniting the fuel charge must be provided. Technician B says that propane does not auto-ignite in a compression-ignition engine. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. CNG requires an ignition source in a modified diesel engine because it does not auto-ignite under compression like diesel does. Similarly, propane also does not auto-ignite in a compression-ignition engine, necessitating an alternative ignition method.

Technician a Says That When Compressed Natural Gas (CNG) Is