Fuels Of The Future
By Carey Russ
Much has been said of late about the future evolution of the
automobile. Low-emission vehicles, ultra-low-emission vehicles,
zero-emission vehicles, and alternative fuels are being considered by
government and industry as solutions to pollution problems. You've
probably heard some of the talk and may be wondering how it
could affect you personally.
You will be affected. There is absolutely no doubt about that. If
you live and drive in any of the more populous parts of the country,
you are already filling your tank with reformulated fuel. If you are
considering the purchase of a new car, you will pay extra because
of environmental regulations. If you are considering purchase of an
older car, you may be in for possible problems and expensive
modifications in order for it to run on current and future fuels. Even
if you don't drive you will be affected by changing pollutants and
more expensive transportation. Both cars and the fuels that they use
will be changing in the future; how much change and in what ways
are the major questions.
The first changes will be to fuel. Leaded gasoline is virtually
extinct in this country. This affects older vehicles and additives are
available to keep problems at bay if you have an applicable
machine. Lead-free gasoline is actually much better for engines as
there is no lead to build up gummy deposits and sludge. Lead was
used as an inexpensive octane booster and to help seal old-tech
valve seats. There are cleaner if more expensive octane boosters
and new materials for valve seats that render lead obsolete with
minor expenses and great benefits to engines and everybody who
breathes.
Also already here is oxygenated fuel. This is gasoline enhanced
with oxygen-containing additives in order to reduce carbon
monoxide emissions. Carbon monoxide reduction is a worthy cause
as carbon monoxide (CO) is highly toxic. It is what kills people
who breathe exhaust fumes. Reducing CO emissions will be
beneficial to all life on this planet.
There are several non-gasoline alternative fuels that are currently
being used, although in relatively small numbers of vehicles and
mostly by fleets. These are primarily compressed natural gas and
alcohol.
Natural gas is one of the best alternatives to gasoline. This is the
same natural gas used in stoves and heaters throughout the country.
For a vehicle fuel it is used in compressed form and stored under
high pressure in metal tanks. Combustion of natural gas produces
very low levels of pollution. Gasoline-powered cars can be
converted to run on natural gas fairly easily. Some manufacturers
are already building cars, vans, and trucks designed to operate on
natural gas. Government and utility company incentives can make
natural gas powered vehicles economically feasible. Right now,
natural gas is less expensive than gasoline. The chief drawback of
natural gas is decreased operating range because of limitations in
storage tank size. This is not necessarily serious for urban use, and,
because of its extremely low pollutant emissions, natural gas can be
an excellent urban fuel. It appears to be the best alternative to
gasoline at this time. However, it is a finite resource (although so
far little-utilized). Also, competition with heating uses could cause
serious problems.
Alcohol and alcohol/gasoline hybrid fuels are already here.
Gasohol, an ethanol/gasoline blend, has been used since the fuel
crises of the 1970s. Methanol and methanol/gasoline blends are also
available, although not yet on a widespread basis. Both decrease
carbon monoxide emissions. Although gasohol has been blamed for
fuel system damage in the past, methanol is far more destructive.
Modifications to rubber and plastic fuel system components are
necessary for its use. For normal use, methanol has been blended
with gasoline. However, it is a perfectly good fuel on its own - all
CART and Indy Racing League race cars use methanol-based fuel,
as do many dragsters. Ethanol and methanol can be manufactured
from a variety of sources, and can decrease petroleum use.
Natural gas and alcohol-powered cars feel perfectly normal in
use providing that the proper fuel system modifications have been
performed. Future vehicles that operate on these fuel sources will
provide clean transportation with minimal impact in convenience,
still using internal combustion engines.