Two-stroke engines produce a lot of
pollution - so much, in fact, that it is likely that you won't see
them around too much longer.
The pollution comes from
two sources. The first is the combustion of the oil. The oil makes
all two-stroke engines smoky to some extent, and a badly worn
two-stroke engine can emit huge clouds of oily smoke. The second
reason is less obvious but can be seen in the following figure:
Each time a new charge of air/fuel
is loaded into the combustion
chamber, part of it leaks out through the exhaust
port. That's why you see a sheen of oil around any two-stroke boat
motor. The leaking hydrocarbons from the fresh fuel combined with
the leaking oil is a real mess for the environment.
These disadvantages mean that
two-stroke engines are used only in applications where the motor
is not used very often and a fantastic power-to-weight ratio is
important.
In the meantime, manufacturers
have been working to shrink and lighten four-stroke engines, and
you can see that research coming to market in a variety of new
marine and lawn-care products.
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