Diesel engines offer the lowest specific fuel usage of any other large internal combustion engine. Thefact remains, two-stroke diesels with high pressureforced induction, particularly turbo charging, make up a large percentage of the largest diesel engines.Throughout North America, diesel engines are generallyused in larger trucks, where the low stress, highefficiency cycle will lead to a much longer enginelife and lower costs to operate. These advantagesalso help to make the diesel engine ideal for use inthe heavy haul industry.Cars however, continue to use gasoline, primarily due to the consumer desire for a wider range of RPM. In Europe, the use of diesel engines with carsis far more common. Even though diesel engines are more efficient whenthrottled down, they aren’t suitable for most typesof aircraft. The higher compression ratios of thediesel cycle demand a much stronger block, head, and almost all moving parts in general. Thesestronger parts add a lot of weight, or a lot of expense, especially if lighter alloys are being used.The Otto cycle engines are much cheaper to build forthese reasons, although they have long been overtakenby the turbine engines. For the same displacementof the engine, Otto cycles will produce more actualpower than a Diesel cycle can, because the fuelwill burn at a much faster rate, allowing more powerstrokes per minute than a standard diesel can offer.What this means, is that less fuel has to be carried.Additionally, commercial aircraft is normally runat preset limits, so that Otto cycle engines used in aircraft don’t suffer anywhere near the efficiencypenalties that land vehicles do. Heavy equipment,such as those used in mining and construction, almost always uses diesel engines.Diesel engines are also used with submarines. Inthese types of submarines, the diesel engine is runwhen the submarine is on the surface, which chargesthe batteries that power the submarine once it issubmerged. All across the world, diesel engines serve many different purposes. They are used with almost alltypes of heavy machinery, and other vehicles. Gasisn’t the way to go with heavy machinery, as theengines simply can’t withstand the beating.Diesel has been popular for many years with machineryand submarines, simply because the engines can last for years and years. Although they won’t offeras much speed as gasoline, the torque and power isstill there.
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