King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge

How is fuel ignited inside a heavy-duty commercial truck engine?

80%

Correct!

Incorrect!

Unlike gasoline engines that use spark plugs, diesel engines are compression-ignition engines. They squeeze air inside the cylinder to extreme pressure and heat, so when diesel is injected, it instantly ignites on contact.

How is fuel ignited inside a heavy-duty commercial truck engine?

High combustion electric spark plugs

Intense heat generated by air compression

A pilot flame inside the intake manifold

Heat transferred from the exhaust manifold

80%