Snowmobiles Snowmobiles are vehicles that are propelled by one rubber track with skis for steering. They are designed to be operated on snow and ice, and require no road or trail for operation. The three main types of riding conditions that snowmobiles are utilized for are Snocross/Racing, trail riding and mountain climbing.
Two-stroke gasoline engines power most snowmobiles, and the performance benefits and lighter operating weight continue to be strong selling points for these models. Four-stroke engines are becoming more popular in snowmobiles, but Yamaha is currently the only manufacturer offering an almost entirely four-stroke lineup of machines. With new EPA clean air standards set to go into effect in 2010, snowmobile manufacturers will move almost entirely to four-stroke models to meet the new federal emission requirements. This should fuel a continued increase in sales of four-stroke models.
While the vast majority of snowmobiles are liquid-cooled, manufacturers do still offer a few fan-cooled models, but they are predicted to be phased out of production soon.
High-performance snowmobiles will beat most stock or aftermarket cars in 0-100 miles per hour drag race (when the snowmobile is equipped for "asphalt drags". Many 2007 snowmobiles will accelerate to over 100 miles per hour in under six seconds (when set-up for ice-drags). Mountain sleds permit access in remote areas with deep snow, which was nearly impossible a few decades ago. This is mainly due to improvements in technology.
AMSOIL offers a wide variety of products for the snowmobile market, along with strong positive name recognition to accompany them. The AMSOIL name is known throughout the snowmobile industry thanks to great products and a very successful snocross racing effort.
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.
Exhaust power valve with deposit build-up
Clean exhaust power valve
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 sleds 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:
Extending time between cleanings through the use of AMSOIL 2-Cycle Oils
Monitoring and adjusting oil consumption as needed
Cleaning the valves before they get stuck to allow for easier removal
Product Code: AITQT-EAHigh-performance 2-cycle oil with an emphasis on exhaust power valves. Contains high levels of detergent additives to prevent valve sticking. Replaces manufacturer-branded oils. Injector use or 50:1 premix. Excellent in snowmobiles, motorcycles, PWC, ATVs and jet boats.Package Size:Unit of Measure:Quantity:Retail Price (USD):
Product Code: HPIQT-EAExcellent for all outboard motors with a performance emphasis on modern direct-fuel-injected (DFI) technology. Also recommended for personal watercraft, jet boats, motorcycles, snowmobiles and ATVs. Injector use or 50:1 premix.Package Size:Unit of Measure:Quantity:Retail Price (USD):
Product Code: AFFQT-EASpecially formulated for 4-stroke recreational motors, ATV's and snowmobiles. Reduces wear. Wet-clutch compatible. Contains no friction modifiers. Broad viscosity range makes it excellent for use in both hot and cold weather conditions.Package Size:Unit of Measure:Quantity:Retail Price (USD):
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Snowmobiles
