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INJECTION SYSTEMS

Over time, Clean Engines International will be deploying several types of injection systems, direct in-cylinder (DI) and transfer port injection (XPI). CEI will be incorporating these techniques in retrofit kits for two-stroke and four-stroke engines resulting in cleaner and more fuel efficient combustion than conventional carbureted two-strokes and replacement four-stroke engines.

Unburned fuel = Red | Burned fuel = Yellow | Fresh air = Blue


Normally carbureted engines send up to 40% of the fuel straight through the cylinder and out the tailpipe unburned. This causes a huge loss of fuel efficiency and is the major contributor to the air pollution.

  1. In an injection system, the carburetor is eliminated, and the fuel is introduced into the combustion chamber via an injector mounted in the top of the chamber’s cylinder head (DI), or in the port adjacent to the cylinder combustion chamber (XPI).
  2. After the fuel is burned, exhaust products are scavenged from the cylinder using air only.
  3. In both DI and XPI systems, fuel is injected into the cylinder late in the cycle, as the piston closes off the exhaust port, so little unburned fuel escapes during scavenging.

More complete burning of the available fuel results in much lower hydrocarbon emissions and 40% more efficient fuel consumption, compared to un-retrofitted 2-strokes. In addition, the injection process allows for a locally rich region around the spark plug, eliminating the need for enrichment of the entire cylinder to achieve stable combustion. Leaner air/fuel ratios significantly reduce carbon monoxide emissions.

What products is CEI offering? >>