A Look at Snowmobile Exhaust
Mounted in the exhaust port of certain
snowmobile models, exhaust power valves are devices designed
to improve combustion efficiency at varying RPM. Improved
efficiency increases horsepower and lowers exhaust emissions.
At low RPM the valves are in
a closed position, allowing for more efficient combustion
and minimizing the levels of unburned gases escaping down
the exhaust port. At high RPM the valves are in an open position,
allowing the motor to breathe more freely and improving the
scavenging effect needed for efficient performance in two-cycle
Because exhaust power valves
are located in the direct stream of exhaust flow, deposits
consisting of soot, carbon and ash quickly accumulate, requiring
the valves to be cleaned regularly. If they are not cleaned,
they may get stuck, and operators will notice a considerable
power loss and/or bog-type operation.
power valve with deposit build-up
In some instances, deposit build-up
may be worse than others. There are several reasons for this:
The machine may be consuming
more oil than is needed. Oil injection pumps vary the amount
of oil injected based on the throttle position. As the throttle
is opened, oil consumption increases. AMSOIL 2-Cycle Oils
are recommended for use at 50:1 mix ratios, but if the sled
is consuming more than one quart of oil per 12 gallons of
gas, it is exceeding an average mix ratio of 50:1. The less
oil the sled burns, the fewer the deposits that accumulate
on the exhaust power valves. If you wish to have a sled's
oil injection pump setting checked, AMSOIL recommends bringing
it to a local dealership so a qualified snowmobile mechanic
can make the correct adjustments.
Another contributing factor
to excessive deposit build-up is riding style. Snowmobiles
operated at low speeds and/or steady RPM for extended periods
of time will accumulate deposits more quickly than snowmobiles
operated at higher speeds. Two-cycle motors do not operate
at maximum efficiency at slower speeds, causing a large percentage
of unburned fuel and oil to exit through the exhaust. This
unburned material accumulates on exhaust valves and forms
deposits. Also, since snowmobiles operated at low-level constant
RPM do not frequently actuate the valve, it allows deposits
to form more rapidly, requiring more frequent valve maintenance.
Snowmobiles run at higher RPM
operate more efficiently and can extend time between valve
cleanings. Efficient operation results in increased combustion
temperatures and more complete burning of the oil/fuel charge.
Higher RPM also means the exhaust power valve is more frequently
actuated, disrupting deposits and slowing down their accumulation.
Finally, the type of two-cycle
oil used in a snowmobile can improve valve cleanliness and
extend maintenance. Because they effectively fight deposit
formation, AMSOIL Synthetic 2-Cycle Oils exhibit better overall
performance than petroleum two-cycle oils. AMSOIL Synthetic
2-Cycle Oils also resist friction and heat more effectively,
burn cleaner and can safely be used at 50:1 mix ratios.
Routine maintenance is important
for snowmobiles equipped with exhaust power valves. However,
maintenance can be eased through the following:
New AMSOIL 2-Cycle Oils provide second-to-none protection
and performance in modern two-cycle equipment
Two-cycle engines remain the
workhorses in recreational equipment, including outboard motors,
motorcycles, snowmobiles and personal watercraft, as well
as in lawn and garden applications like lawn mowers and weed
eaters. Design changes over recent years have included direct
fuel injection engines, in which fuel is injected directly
into the combustion chamber, and exhaust power valves, which
improve combustion efficiency at varying RPM. These design
changes have allowed two-cycle engine manufacturers to effectively
reduce emissions, improve fuel efficiency and decrease oil
consumption. Today's two-cycle motors of all types require
specialized oil technology to deliver maximum engine protection,
dependable operation and long service life.
It is common knowledge
that, at some point, engine oil must be changed. It's something
that is preached relentlessly to vehicle owners by vehicle
manufacturers, quick lubes and oil companies. But consumers
are widely unaware of what exactly makes oil changes necessary.
Many factors contribute
to a motor oil's demise, but it is essentially the accumulation
of contaminants in the oil and chemical changes in the oil
itself that make a motor unfit for further service. With time,
it is inevitable that the oil will be contaminated by dirt
or sludge, or succumb to the extreme pressures or temperatures
found inside an engine. AMSOIL Motor Oils are formulated with
the industry's most advanced synthetic base stocks and additive
packages to combat the forces that deteriorate conventional
What is the NOACK Volatility
Volatization is a term used to describe
what happens to a fluid as it is heated to the point it begins
to "boil off." Upon reaching a certain temperature,
oil will begin to lose some of its lighter weight molecules
as they "boil off" and leave heavier weight molecules
behind. Not only does this cause higher oil consumption, this
process can also cause increased viscosity making the oil
more difficult to circulate through the lubrication system.
Quality Takes Priority at AMSOIL
The AMSOIL chemical
laboratory plays an important role in the daily operations
at AMSOIL headquarters. The lab fulfills tech service requests,
performs competitor testing and comparisons, and works on
the research and development of products at AMSOIL. One of
the most important jobs at the lab is quality control. AMSOIL
is known for formulating high-quality products and the AMSOIL
chemists ensure that everything coming in and going out meets
AMSOIL standards. How do they do it? (read
Synthetic Motor Oils offer the longest drain intervals
on the market, unsurpassed protection and performance that
effectively extends equipment life and improved fuel economy,
saving customers money at the pump and reducing the nation's
dependence on foreign oil.
INC. warrants that the use of its lubricants will not cause
mechanical damage to any mechanically sound equipment when
AMSOIL INC. products are used in full compliance with the
company's recommendations and instructions."
synthetic motor oils are formulated to surpass engine test
specifications, offering protection far greater than competing
motor oils for extended drain intervals. Most synthetic oil
manufacturers make no claim to extended drain intervals, deferring
to the maintenance schedule provided by the vehicle manufacturer.
With its unparalleled oil and warranty program, AMSOIL offers
consumers unprecedented protection and economics.
More than 20 years
ago, AMSOIL began using the NOACK volatility test as a comparison
tool and measurement of quality. Back then, nearly every oil
tested side-by-side with AMSOIL synthetic motor oils failed,
and those that passed barely squeaked by. Other oil companies
paid no attention to NOACK results until Ford Motor Company
made it a requirement for service fill oils, validating what
AMSOIL had said all along.
NOACK Volatility Test
Volatility Test determines the evaporation loss
of lubricants in high temperature service. The more
motor oils vaporize, the thicker and heavier they become,
contributing to poor circulation, reduced fuel economy
and increased oil consumption, wear and emissions. AMSOIL
Synthetic Motor Oil resists high temperature volatization
better than other motor oils. AMSOIL Synthetic Motor
Oil maintains peak fuel efficiency and reduces oil consumption
AMSOIL Now An ISO Certified
received ISO 9001:2000 certification of our Quality Management
System (QMS). NSF International Strategic Registrations is
the registrar that has verified our QMS meets the requirements
of the ISO 9001:2000 standard, the most widely utilized quality
standard throughout the world for quality management systems.
ISO standards are used by over 300,000 companies worldwide
setting rigorous standards for businesses, government and
is applicable to any manufacturing and service organization
providing a framework for system development that focuses
on the customer, quality system performance and ongoing improvement.
AMSOIL received ISO 9001:2000 registration under the scope:
synthetic lubricants blending, packaging, and other fulfillment
directly associated with lubricant product.
certification puts AMSOIL in line with some of the most efficient
companies in the world. It is further assurance that the products
and services AMSOIL provides will continue to maintain the
high level of quality the company always demanded.
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