Table of Contents
Why are diesel engines so slow?
Diesel engines are generally heavier than their petrol counterparts making them slower. As a consequence of a higher compression ratio (longer stroke), diesel engines produce more torque which means you get more acceleration off the line.
Why are diesel engines lower rpm?
The relatively high-compression ratio necessary to ignite the diesel fuel (17:1 diesel versus 9:1 gasoline), allows the diesel engine to generate all its torque and power at a lower rpm. This gives you more power off the line compared to a gasoline engine which generates more power the faster it’s moving.
Why are diesel engines not used in racing?
Diesel is not normally preferred for speed racing, due to the generally higher weight compared to a petrol-driven vehicle. In motorsports such as off-road trials or truck racing, diesel may be more predominant. In endurance racing, the broad power band, high torque and fuel economy can prove advantageous.
Why is diesel unpopular in the US?
Many consumers of diesel trucks hated the newer technologies due to the increased maintenance costs, lower torque ratios and reduced horsepower. Today those problems have been solved and in fact emissions technology has been shown to increase horsepower and engine efficiency output.
Are diesels harder to work on?
Diesel engines are easier to work on because components are designed with maintenance in mind. In general, diesel engines are less complicated and require less tooling. Components are usually easier to reach and therefore make replacing parts and regular maintenance simpler.
Why do diesels have such low redlines?
Diesel engines normally have lower redlines than comparably sized gasoline engines, largely because of fuel-atomization limitations. Gasoline automobile engines typically will have a redline at around 5500 to 7000 rpm.
Why do diesels have long strokes?
Diesel engines are designed with longer strokes in mind, as this produces more torque and more power. The more pressure built in the strokes and cylinders, the more torque the wheels will have. The combustion temperature of diesel fuel is also designed for higher torque.
What are the advantages of low-speed engines?
However the engines can also be used in a grid support role or in a situation where the power demand fluctuates. One of the advantages of low-speed engines is their part load efficiency which varies very little over a range of outputs between 50\% and 100\% load.
How does load affect the output of a diesel engine?
Whereas gas and steam turbines outputs tend to fall as the load decreases, that of a low-speed diesel engine is relatively flat over a similar load range.
What are the problems of small high speed diesel engine?
The small high speed diesel engine poses particular problems for the designer because of the short time available for the processes of combustion. Furthermore, in many of its applications it is subject to severe constraints regarding noise and exhaust emissions; consequently it will be given special attention here.
Why do lower engine speeds produce less NO x?
Lower engine speeds generally produce a higher concentration of NO x for a given power due to the longer time available for the reactions. 2. NO x reduction is generally attributed to less violent burning experienced with shorter ignition delay (ID) periods associated with high cetane number fuels.