Technician A says that the greater the temperature difference between the cylinder temperature on the compression stroke and the firepoint of the fuel, the longer the ignition lag. Technician B says that a typical diesel fuel formulated for on highway use has a firepoint of about 250 degrees Celsius (482 degrees Fahrenheit). Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because ignition lag in diesel engines is indeed influenced by the temperature difference between the compressed air in the cylinder and the fuel's fire point; a greater difference can lead to longer ignition lag. Technician B is also correct, as the fire point of typical diesel fuel formulated for on-highway use is approximately 250 degrees Celsius (482 degrees Fahrenheit), which is a common specification for diesel fuels.

Technician a Says That the Greater the Temperature Difference Between