Let’s check out how the current diesels work from our ASE certified master technicians.
The Comeback Kid – compared to mid-1990, diesel vehicles have made a significant comeback. The gain in popularity is the effect of steady improvements to the diesel motor. New engine designs, noise and vibration detection technologies like digital engine control have spawned a brand-new production of diesel engines that are more strong and 30-35% more fuel efficient than comparable size gasoline engines, all while running smoother and quieter than diesel engines before.
These improvements have been noise levels are down and reliability has been improved. Tail pipe emissions are down and Horsepower and torque are up. Many of today’s diesel engines that come as an alternative from the medium duty trucks would be now advertising over 800ft pounds of torque. Those amounts were unheard of 20 years ago.
The ability of Compression – To assist to todays advanced diesel engines is helpful to know how the diesel engine works. The main distinction between a diesel and petrol engine is the lack of an ignition method to ignite the fuel mix. Diesel engines are compression ignition engines instead of ignite ignition, so there are no ignite plugs, wires, or ignition coil.
Diesels also have a much higher compression ratio compared to petrol engines. This allows the air to compress into a narrower space in the cylinder. This also creates the high temperatures needed to ignite the air fuel mixture.
Let’s not forget the fuel, either. The kind of fuel utilized in petrol and diesel motors contributes to the power produced by the motor. Compression ignition motors burn fuel, which allows diesel motors to have good gas mileage while generating more power than petrol engines.
Heavy Duty, Not Invincible – Because of the combustion and high compression ratio inherent in diesel engines, diesel gas components of the system need to be capable to withstand high internal pressure.
Thats why diesel parts are made of high grade metals. But the strongest, heaviest metal cannot do much for a diesel component which has clearances down into six millionths of an inch. These tight tolerances would be the reason why heavy duty diesel motors are still have issues.
For instance, the least amount of dirt can wreak havoc on the motors internal components and gas injection system. While water may cause corrosive harm and speed up wear. It is important to remember this crucial initial step in diesel diagnosis.
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