Benefits of CNG Conversion of Diesel Engines

• Better Emission Standards:
• Reduced PM
• Reduced Ozone Depletion.
• Reduced Air Toxins
• Lower Noise pollution
• Better Economy:
• Lower Operating Costs
• Lower Maintenance Costs
• Domestic Supply/Foreign Exchange Savings

Pollution Effects of Replacing Diesel with CNG 

• Modern engines with three-way catalytic converters and closed-loop air-fuel ratio control have low emissions already
  • Converting these engines to CNG is likely to decrease emissions further.

• For engines without emission control, conversion to CNG gives: much lower CO, much lower and less-toxic HC, but higher NOx
• Depends on air-fuel ratio control system and adjustment
• Retrofitting closed-loop CNG injection with TWC gives large (90+ percent) emission reductions.