Compressed natural gas is mixed with the intake air
Diesel is the ignition source and used in the start up
Gas replaces diesel with a 50 – 70% substitution rate
In dual fuel mode, natural gas is introduced into the engine’s intake system. The air-to-natural gas mixture is then drawn into the cylinder, just as it would be in a spark-ignited engine, but with a leaner air-to-fuel ratio. Near the end of the compression stroke, diesel fuel is injected and ignites, causing the natural gas to burn.
A dual fuel engine can operate on 100 percent diesel fuel or the substitution mixture of diesel and natural gas, delivering the same power density, torque curve and transient response as the base diesel engine