and are divided into two general classes, specifically
two cycle and four cycle engines. A cycle of an
engine represents one stroke of the piston or one
half revolution of the crank shaft, as a complete
revolution represents two cycles. With a two cycle
engine, the power impulse occurs at each revolution,
while with four cycle engines it occurs at every
other revolution, hence the terms two and four cycle
Both classes have their own specific advantages and
uses. For autombiles, the four cycle engines is
most used. For motor boats on the other hand, the
two cycle engine is most often used.
The horse power of gas engines is designated as HP
and also brake test HP. The IHP is the theoretical
HP, which is found by figuring different formulas,
in which the diameter of the bore, length of the
stroke in inches, and number of revolutions per
minute form the basis for calculation. The results
are found by the use of such formulas.
The BTHP on the other hand, is the power the engine
actually develops in service, and is considerably
less than the IHP. Keep in mind, this depends upon
the degree of the mechanical perfection attained in
the construction of the same. If both the compression
and construction are good, the engine may actually
reach 80 - 88% of the intended IHP.
With gasoline engines, high HP and high RPM ranges
are what makes them popular. Gas engines have always
been more popular than diesel vehicles, for the simple
fact that they can achieve more speed. If speed
is what you are after, gasoline vehicles are what
you should be looking for. Although they may lack
in torque and raw power, they make up for it with
speed and tuning options.
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Diesel Or Not
Advantages Of Diesel Engines
If you've owned a diesel powered vehicle in the past or if you own one now, you no doubt appreciate the qualities this engine provides you with. More torque, better fuel economy, and easier maintenance are but a few of the attributes of...
Diesel And Gas Prices
Over the years, the prices of both gas and diesel have experienced some drastic changes. Many years ago, the price of gas was around a dollar or a little more, nothing like it is today. Back then, gas wasn't high in price although the...
Diesel Or Not
Diesel is often looked at as being smelly, noisy, and many think the only place for it is in a tractor. The truth to diesel vehicles is that they are slow, noisy, smelly, although they are cheaper to run than gas. Diesel engines aren't...
Diesel Passenger Vehicles
Both diesel cars and light trucks are receiving a lot of attention in the United States as a near term strategy to achieve fuel economy and climate change goals. The renewed interest in diesel as of late stems from its potential to...
Diesel Versus Spark Engine Ignition
As you may already be aware of, diesel engines are more efficient than gasoline engines of the same power, resulting in much lower fuel usage. For an efficient turbo diesel, the average is 40% more miles per gallon. The higher compression...
Gas Tractor Versus Diesel Tractor
There are many different reasons as to why a diesel compact tractor is superior to a gasoline garden tractor. First of all, the diesel engine doesn't have the parts that normally wear out or give problems. There are no spark plugs,...
Gas Versus Diesel
Cost Due to the high compression ratios and resulting high cylinder pressure in diesel engines, they must be built to withstand a lot more punishment than gas engines. The parts that are spruced up include a thicker block and cylinder...
Hydrogen Boosted Gas Engines
With the ever increasing cost of gasoline prices, auto makers are having to work overtime to cost effictively improve the fuel economy, while still meeting the strict emission requirements of today with gasoline engines. One ideal and...
Industrial Diesel Engines
Industrial diesel engines are any engines that are used for industrial purposes that run on diesel. Industrial diesel engines are used to power a major portion of industrial machinery, from motorbikes to bulldozers, generators, and even...
Why You Should Choose Diesel
The major distinction between diesel and gas lies in the type of ignition. While gas engines operate on spark ignition, diesel engines employ compression ignition for igniting the fuel. With compression, the air is drawn into the engine...
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