|
AMSOIL
Synthetic 2-Cycle Oils and Snowmobile Exhaust
Power Valves
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 motors.
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.
In some instances, deposit buildup 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:
1. Extending time between cleanings
through the use of AMSOIL 2-Cycle Oils
2. Monitoring and adjusting oil consumption
as needed
3. Cleaning the valves before they
get stuck to allow for easier
removal
4. Using AMSOIL Power Foam to
loosen the deposits
  
T's Advanced Synthetics
Greg and Marcy Thurman
Your Nationwide
AMSOIL
Authorized Independent
Dealer
Nationwide US Warehouses,
Canada and Palm Harbor, FL
727-798-8552
E-Mail:
greg@tsadvancedsynthetics.com
If you
experience problems or have questions or comments about
our website please email us at
greg@tsadvancedsynthetics.com
Home
|
T's Privacy Policy
|
Links |
Contact Us
|
