Diesel Engines

R & M Diesel Engine and Truck Repair Services of Arkansas.
Located in Sheridan, Arkansas.

Despite their superior fuel economy over similar gas engines, unlike Europeans many Americans still think of diesels as the noisy, sooty, smelly, unreliable motors of the 1970s and 1980s. You may think diesel engines are noisy, smoky, slow and sluggish, but diesels have changed.

The modern diesel engine is powerful, clean and extremely fuel-efficient. Today’s Diesels use a low-sulfur form of diesel fuel, and systems within the car help eliminate particle matter and excess pollution. The diesels use engine improvements like turbocharging, sophisticated fuel injection, and computer control to provide a driving experience that’s both efficient and high in torque.
Many Modern Diesel Engines can achieve well over 40 miles per gallon (17 kilometers per liter) on the highway. Today’s diesels are not only powerful, economical, quiet, and environmentally clean, they are responsive and capable of performance that exceeds that of gasoline engines in many instances.
For example, the world’s fastest pickup truck has a 2003 Cummins 5.9 L, 24-valve, in-line, six-cylinder engine , and the truck is quiet, street-driven, and even pulled its own support trailer to the Bonneville Salt Flats for the certified Land Speed Record runs.

Electronic fuel management advancements have been responsible for this dramatic evolution and refinement of diesel engines.

Modern diesel technology utilizes significantly higher injection pressure. The four valves per cylinder found on most diesels allows positioning of the fuel injection nozzle directly in the center of the combustion chamber aimed into the middle of the cylinder. Further, computer-controlled fuel injectors can now be controlled to “shape” the fuel injection curve somewhat using multiple injection events during each firing cycle. This is possible by utilizing computer control of the injectors and ultra-high fuel pressure in a common fuel rail that feeds the injectors, hence the name “common rail injection”. This new technology allows controlling the air/fuel mixture for a more even burn with multiple injection events during the compression and power cycles. For example, a small amount of fuel is pre-injected early in the compression cycle to begin the burning process without the noisy clatter previously associated with diesels. Such a pre-injection pulse is called “pilot” injection. This is followed by the main fuel injection pulse dictated by throttle position. The timing and delivery of the main pulse also helps reduce combustion noise and emissions while producing optimum torque and fuel efficiency. And lastly, a post-injection pulse can help burn off soot produced during the main burn. This post burn occurs at a relatively low combustion temperature, and is sometimes referred to as a “cold burn”.

Significant research continues in electronic fuel management to refine the injection process for reduced emissions and more efficiency. The diesel engine is the most fuel-efficient energy-conversion device in mass production today. State-of-the-art diesels are setting performance records that eclipse gasoline engines. Having already overcome most of the objections against diesels, engineers continue to refine electronic fuel management and emission controls. Diesel fuel is more commonly available at many service stations, eliminating yet another perceived disadvantage.

All that remains to be changed is the American public perception of diesel Engines.

About Us
e-mail –R&M Diesel Services of Arkansas 
   Phone – 870-941-6160