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New AMSOIL "Fabulous Four" 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, snowmobil es 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
As the leader in two-cycle oil technology, AMSOIL has performed extensive research in developing a new line of revolutionary, specialized oils called the "Fabulous Four." AMSOIL INTERCEPTOR Synthetic 2-Cycle Oil (AIT) was the first new oil to be introduced. It is primarily recommended as an injector oil or at a 50:1 mix ratio in carbureted, electronic fuel injected (EFI) and direct fuel injected (DFI) snowmobiles, personal watercraft, motorcycles and ATV's. Formulated with wax-free premium quality synthetic esters and a spe cialized additive package, INTERCEPTOR is designed to address the exhaust valve sticking problems associated with certain snowmobile models.
New AMSOIL HP Injector Synthetic 2-Cycle Oil (HPI), DOMINATOR Synthetic 2-Cycle Racing Oil (TDR) and Saber Professional (ATP) and Outboard (ATO) Synthetic 100:1 Pre-Mix 2-Cycle Oils complete the Fabulous Four lineup, replacing AMSOIL Synthetic 2-Cycle Injector Oil, Series 2000 Synthetic 2-Cycle Racing Oil and 100:1 Pre-Mix Synthetic 2-Cycle Oil, respectively. The application chart below ranks each oil's performance in common two-cycle applications.
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TWO-CYCLE OIL RECOMMENDATION
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AMSOIL Product
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Outboard *
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Snowmobile
Motorcycle* & ATV*
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Personal Watercraft*
& Jet Boat*
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Chainsaw,
Chop Saw & Pump
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Weed Eater,
Blower & Lawn Mower
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Moped, Scooter
& Go-Cart
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HP Injector (HPI)
TC-W3, API TC
(Injection or 50:1 Pre-Mix)
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Excellent
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Very Good
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Very Good
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Not recomm.
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Not recomm.
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Not recomm.
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INTERCEPTOR (AIT)
API TC, JASO FC
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Not recomm.
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Excellent
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Excellent
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Good
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Good
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Good
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DOMINATOR (TDR)
API TC, JASO FC
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Racing (1)
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Racing (2)
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Racing (2)
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Very Good
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Very Good
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Very Good
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Saber Professional 100:1 (ATP)
Pre-Mix ISO-L-EGD
JASO FC, API TC
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Not recomm.
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Very Good
Pre-Mix Only
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Very Good
Pre-Mix Only
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Excellent
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Excellent
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Excellent
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Saber Outboard 100:1 (ATO)
Pre-Mix, TC-W3, API TC
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Excellent
Pre-Mix Only
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Very Good
Pre-Mix Only
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Very Good
Pre-Mix Only
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Not recomm.
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Not recomm.
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Not recomm.
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Excellent: "The" primary recommendation for the oil. This is the best possible choice for the application. The oil is specifically designed for the operating conditions of the motors in these markets. There is only one "Excellent" recommendation per category.
Very Good: A main recommendation for the oil. Identifies an oil that is very good for the operating conditions of these motors.
Good: A secondary recommendation for an oil. The oil was not specifically designed for these applications, however, the chemistry in the oil is suited to the operating conditions of these motors.
Not Recommended: Identifies applications where the product was not intended for use. "Excellent" rated products offer superior performance.
Racing:
- (1) Not recommended for long-term use in outboard motors as a TC-W3 type oil, although excellent as a race oil for short term use where motors are periodically inspected.
- (2) Excellent for racing or modified motors. Very good for recreational use.
- *Recommended for all (OFI) direct fuel injected, (EFI) electronic fuel injected, and carbureted motors. Outboard motors include Mercury®, Optimax®, Johnson® & Evinrude® FICHT® & E-TEC®, Yamaha® HPDI, Nissan® & Tohatsu® TLDI®
AMSOIL Synthetic 2-Cycle Oils
Reduce friction and wear, improve throttle response and deliver maximum power. Clean-burning ashless formulations prevent plug fouling and carbon deposits. Deliver quick, dependable starts. Reduce smoke and emissions and won't "load up" during prolonged idling. Provide outstanding cold temperature flow. Contain special anti-rust agents for off-season storage. AMSOIL PDF Online Product Catalog.
AMSOIL Synthetic 2-Cycle Oils are superior quality lubricants which provide maximum protection and outstanding performance in all two-cycle gasoline engines.
Maximum Wear  Protection
AMSOIL Synthetic 2-Cycle Oils are high film strength oils that virtually eliminate metal to metal contact so piston scuffing is prevented and wear is reduced. The high lubricity of AMSOIL Synthetic 2-Cycle Oils reduces friction so operating temperatures are controlled and maximum engine performance is achieved.
Reduced Engine Deposits
AMSOIL Synthetic 2-Cycle Oils contain top performing additives which have been tested and proven to minimize high temperature deposits. These oils resist oil breakdown from heat so they do not form gum, varnish, sludge or sticky deposits. Spark plug fouling and excessive carbon build-up in the combustion chamber, exhaust port and ring area are greatly reduced. In addition, the clean burn characteristics and lean mix ratios reduce smoke and exhaust emissions.
Prevents Rust and Corrosion
AMSOIL Synthetic 2-Cycle Oils contain special rust and corrosion inhibitors, providing excellent off-season storage protection.
Outstanding Low Temperature Performance
Both AMSOIL Synthetic Injector Oil and 100:1 Pre-mix Oil mix readily with fuel even in low temperatures. However, AMSOIL Injector Oil with its -45°F pour point and SAE #4 miscibility and fluidity rating, is better suited for severe cold. It is recommended for use in injector systems as well as 50:1 pre-mix. Also, AMSOIL injector oil will help ease starting because it does not solidify or get gummy in the motor which allows it to turn over more freely.
NEW!
AMSOIL Interceptor High Performance
Synthetic 2-Cycle Oil
- Eliminates hard carbon deposits in ring grooves, piston skirts and exhaust power valves.
- Extends engine life by reducing wear on cylinders, pistons and bearings.
- Reduces smoke and odor with two-cycle engines
- Prevents plug fouling.
- Provides exceptional SAE #4 cold temperature fluidity (-54°) pour point).
- Protects against rust.
- Prevents pre-detonation by eliminating "hot spots."
- Recommended for Applications Requiring the Following Specifications: API TC, JASO FC.
Product Code: AIT
PRODUCT DESCRIPTION
AMSOIL INTERCEPTOR Synthetic 2-Cycle Oil is formulated with a proprietary blend of the finest synthetic base oils and additives available today. This unique AMSOIL chemistry represents a breakthrough development in the field of two-cycle engine lubrication.
The backbone of AMSOIL INTERCEPTOR 2-Cycle Oil is a specially developed molecularly saturated synthetic base oil. This, combined with a "double treat" additive package, ensures exceptional lubricity, cleanliness and optimum clean-burning characteristics. Extensive research and testing, including a full snowmobiling season in severe Rocky Mountain applications, has proven that wear on cylinders, pistons and bearings is dramatically reduced. And with up to 30 percent more detergency and dispersancy than typical two-cycle oils, AMSOIL INTERCEPTOR virtually eliminates damaging deposits on piston skirts, ring grooves and exhaust power valves.
APPLICATIONS
AMSOIL INTERCEPTOR Synthetic 2-Cycle Oil is recommended as an injector oil or at a 50:1 mix ratio in carbureted, electronic fuel Injected (EFI) and direct fuel injected (DFI) snowmobiles, personal watercraft, motorcycles, ATVs and jet boats, including, but not limited to, those manufactured by Bombardier®, Yamaha®, Arctic Cat®, Polaris®, Kawasaki®, Suzuki® and Honda®.
It is recommended wherever API TC and JASO FC two-cycle oils are specified. INTERCEPTOR is compatible with and recommended as a replacement for all mineral and synthetic manufacturer branded two-cycle oils. For top performance, mixing is not recommended.
400,000 Miles of Severe Snowmobile Field testing With No Deposit Buildup, Power Valve Sticking, Ring Sticking or Engine Failures.
Subjected to adverse field testing conditions in the Rocky Mountains, including long trail rides, high RPM powder riding and steep hill climbs, AMSOIL INTERCEPTOR demonstrated superior wear protection and outstanding deposit control.
Two-cycle Engine Applications and Lubrication Needs
This article appeared in AMSOIL Action News, July 2001
Two-cycle engines can be found nearly everywhere these days. They are used in dozens of applications and in a wide variety of designs for everything from work and recreation to power generation. Two-cycle engines have design differences and operate under conditions that require different oil chemistries than their four-cycle counterparts. In order to recommend a lubricant for a two-cycle engine, one needs to know how this engine operates, why it is used in place of a four-cycle engine and where and in what type of applications it is used.
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Two-cycle motors deliver one power impulse for each revolution of the crankshaft.
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What is a two-cycle engine?
The terms "two-cycle" and "two-stroke" are often inter-changed when speaking about two-cycle engines. These engines derive their name from the amount of directional changes that the pistons make during each power stroke. Internal combustion engines are used to produce mechanical power from the chemical energy contained in hydrocarbon fuels. The power-producing part of the motor's operating cycle starts inside the motor's cylinders with a compression process. Following this compression, the burning of the fuel-air mixture then releases the fuel's chemical energy and produces high-temperature, high-pressure combustion products. These gases then expand within each cylinder and transfer work to the piston. Thus, as the engine is operated continuously, mechanical power is produced. Each upward or downward movement of the piston is called a stroke. There are two commonly used internal combustion engine cycles: the two-stroke cycle and the four-stroke cycle.
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A four-cycle engine requires four strokes of the piston (two up and two down) and two revolutions of the crankshaft to complete one combustion cycle and provide one power impulse.
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How are two-cycle engines different from four-cycle engines?
The fundamental difference between two-cycle engines and four-cycle engines is in their gas exchange process, or more simply, the removal of the burned gases at the end of each expansion process and the induction of a fresh mixture for the next cycle. The two-cycle engine has an expansion, or power stroke, in each cylinder during each revolution of the crankshaft. The exhaust and the charging processes occur simultaneously as the piston moves through its lowest or bottom center position.
In a four-cycle engine, the burned gasses are first displaced by the piston during an upward stroke, and then a fresh charge enters the cylinder during the following downward stroke. This means that four-cycle engines require two complete turns of the crankshaft to make a power stroke, versus the single turn necessary in a two-cycle engine. In other words, two-cycle engines operate on 360 degrees of crankshaft rotation, whereas four-cycle engines operate on 720 degrees of crankshaft rotation.
Where are two-cycle engines used?
Two-cycle engines are inexpensive to build and operate when compared to four-cycle engines. They are lighter in weight and they can also produce a higher power-to-weight ratio. For these reasons, two-cycle engines are very useful in applications such as chainsaws, Weedeaters, outboards, lawnmowers and motorcycles, to name just a few. Two-cycle engines are also easier to start in cold temperatures. Part of this may be due to their design and the lack of an oil sump. This is a reason why these engines are also commonly used in snowmobiles and snow blowers.
Some advantages and disadvantages of two-cycle engines
Because two-cycle engines can effectively double the number of power strokes per unit time when compared to four-cycle engines, power output is increased. However, it does not increase by a factor of two. The outputs of two-cycle engines range from only 20 to 60 percent above those of equivalent-size four-cycle units. This lower than expected increase is a result of the poorer than ideal charging efficiency, or in other words, incomplete filling of the cylinder volume with fresh fuel and air. There is also a major disadvantage in this power transfer scenario. The higher frequency of combustion events in the two-cycle engine results in higher average heat transfer rates from the hot burned gases to the motor's combustion chamber walls. Higher temperatures and higher thermal stresses in the cylinder head (especially on the piston crown) result. Traditional two-cycle engines are also not highly efficient because a scavenging effect allows up to 30 percent of the unburned fuel/oil mixture into the exhaust. In addition, a portion of the exhaust gas remains in the combustion chamber during the cycle. These inefficiencies contribute to the power loss when compared to four-cycle engines and explains why two-cycle engines can achieve only up to 60 percent more power.
How are two-cycle engines lubricated?
Two-cycle motors are considered total-loss type lubricating systems. Because the crankcase is part of the intake process, it cannot act as an oil sump as is found on four-cycle engines. Lubricating traditional two-cycle engines is done by mixing the oil with the fuel. The oil is burned upon combustion of the air/fuel mixture. Direct Injection engines are different because the fuel is directly injected into the combustion chamber while the oil is injected directly into the crankcase. This process is efficient because the fuel is injected after the exhaust port closes, and therefore more complete combustion of fuel occurs and more power is developed. Direct injection engines have a higher power density than traditional two-cycle engines. Because the oil is directly injected into the crankcase, less oil is necessary and lower oil consumption results (80:1 range). Direct Injection motors have higher combustion temperatures, often up to 120°F. They also require more lubricity than traditional two-cycle motors.
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