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 cars is far more common.
Even though diesel engines are more efficient when throttled down, they aren’t suitable for most types of aircraft. The higher compression ratios of the diesel cycle demand a much stronger block, head,
and almost all moving parts in general. These stronger 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 for
these reasons, although they have long been overtaken
by the turbine engines. For the same displacement
of the engine, Otto cycles will produce more actual
power than a Diesel cycle can, because the fuel
will burn at a much faster rate, allowing more power
strokes per minute than a standard diesel can offer.
What this means, is that less fuel has to be carried.
Additionally, commercial aircraft is normally run
at preset limits, so that Otto cycle engines used
in aircraft don’t suffer anywhere near the efficiency
penalties 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. In
these types of submarines, the diesel engine is run
when the submarine is on the surface, which charges
the batteries that power the submarine once it is
All across the world, diesel engines serve many different purposes. They are used with almost all types of heavy machinery and other vehicles. Gas isn’t the way to go with heavy machinery, as the engines simply can’t withstand the beating.
Diesel has been popular for many years with machinery
and submarines, simply because the engines can
last for years and years. Although they won’t offer
as much speed as gasoline, the torque and power is