Factors in Internal-Combustion-Engine Selection and Use

Internal Combustion Engines. 
These are used in outdoor applications, in well-vented interiors, and in nonhazardous environments. They are generally powered by gas or liquid propane gas, although compressed natural gas (CNG) is a promising alternative. In anticipation of new government regulations, manufacturers are redesigning engines with reduced emissions and improved fuel efficiency.

Industrial Engine.
Typically, this heavier engine is designed to operate in a lower rpm range than an automobile engine. It can be expected to give about 10,000 h of useful life before overhaul. At an equivalent operating speed of 20 mi/h (32 km/h) in an automobile, this would equate to 200,000 mi (321,800 km).

Automotive Engine. 
This is of lighter construction than the industrial engine and, because of the quantities in which it is produced, is of relatively lower cost. It generally operates most efficiently in a higher rpm range than the industrial engine and can be expected to give about 7000 h of useful life prior to overhaul. This life is equivalent to about 140,000 mi (225,260 km) of automobile travel. An advantage of this type of engine is the availability of replacement parts through automotive supply firms.

Air-Cooled Engine.
This is restricted to lighter-duty applications where weight, size, and initial cost are the prime concerns. The absence of a separate cooling system is a distinct advantage, although this engine’s life expectancy is a relatively short 1500 to 2000 h of operation.

Diesel Engine.
Typically, this type is installed in large pieces of equipment where the additional size and cost is not significant. However, because of recent improvements in engine design, diesel engines are becoming more prominent in smaller trucks. This is largely due to the reduced need for periodic maintenance, greater fuel economy per hour of operation, and longer expected life—up to 20,000 h.

Compressed Natural Gas Engine.
This engine design is ideal for indoor use due to its low noise and low emissions. CNG is a low-cost fuel and the truck can run a full shift before requiring fuel. Other benefits include fewer oil changes and lower maintenance costs. This truck is suited for most types of use and can accommodate loads up to 6000 lb (2700 kg).

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