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What is the Noack Volatility Test?

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Modern Two-Stroke Engines Require Advanced Oil

Engine Designers Are Relying On Technology That Increases Performance, But Places More Stress On Motor Oil.

TECH TALK
Dan Peterson, Vice President, AMSOIL Technical Development

Len Groom
Technical Product Manager,
Powersports

Like the engine in your car or truck, the two-stroke engines that power your snowmobile, chainsaw or outboard motor are growing more sophisticated with each passing year. The same demands driving changes in the automotive marKet are influencing two-stoke equipment as well - the government mandates reduced exhaust emissions, while consumers want increased fuel economy and more power.

What's a two-stroke engine manufacturer to do? These three areas of importance - reduced emissions, increased fuel economy and maximum performance - don't play well together. Given the constraints of two-stroke engine design, It's extremely difficult to build an engine that hits all three targets. Because they don't contain intake and exhaust valves like a four-stroke engine, controlling emissions in two-strokes is a big challenge. One strategy in today's oil-injected engines is to adjust the fuel/oil ratio to use less oil. While this reduces emissions, it comes at a cost since using less oil increases operating temperatures and invites several problems.

Excessive heat breaks down the oil and leads to deposits that cause piston rings to stick, robbing the engine of horsepower and reducing performance. In extreme cases, stuck rings can score the cylinder wall and piston skirt, leading to catastrophic failure. To stand up in this intense environment, modern two-strokes require oils with improved heat resistance and lubricity to deliver the necessary level of wear protection.

With snowmobile season gearing up, it's a great time to look at a couple snowmobile engines that offer examples of the innovation we're seeing in the two-stroke market. The Arctic Cat* C-TEC* uses electronics that adjust the fuel/oil ratio depending on operating conditions. In one promotional Arctic Cat video, we're told to expect fuel/oil ratios as high as 65:1, depending on conditions, in the C -TEC2 engine. Less oil means lubrication becomes more challenging. What little oil is available to protect critical engine parts must reach components quickly, particularly in sub-zero cold, and stand up to intense heat and friction once it's distributed throughout the engine.

The C -TEC uses an interesting configuration to deliver oil to the wrist pin and bearing. The fuel/oil mixture is injected into the boost-port side of the cylinder. At higher rpm, oil is also injected into the crankcase through a slot in the piston. The setup, according to Arctic Cat, improves performance, emissions and fuel economy.

The Ski-Doo* E-TEC* offers another example. Like many cars and trucks today, the E-TEC uses direct injection. Placing the fuel injectors directly in the combustion chamber allows precise control over the injection event, which improves power and reduces emissions. This arrangement, however, comes with challenges. In a traditional two-stroke engine, fuel and oil are mixed prior to being ingested by the engine, which helps the oil flow at lower temperatures since fuel reduces oil viscosity. In the E-TEC, fuel and oil are mixed only in the combustion chamber, so the bottom end of the engine - the crankshaft and rods - are lubricated by oil alone, making the oil's cold-flow properties critical.

The bottom line is two-strokes require higher-quality oils than before. In the snowmobile market specifically, an oil must excel in three areas: cold-flow, piston protection and exhaust power valve cleanliness. AMSOIL INTERCEPTOR®, our primary snowmobile recommendation, is proven to excel in all three areas. In 50 hours of extreme dyno testing, it completely prevented ring sticking and piston scuffing. It also boasts a -72°F cold-flow ability. Visit amsoil.com/proof for complete results.

We've invested countless hours in our mechanical test lab, In the field and on the racetrack fine-tuning our two-stroke oils to deliver the benefits today's two-stroke engines need. As the two-stroke market continues to evolve, you can bet we'll continue to develop and manufacture synthetic two-stroke oils that meet and even exceed the demands of today's toughest two-stroke engines, regardless of who builds them. Published, AMSOIL Magazine 11/15.

Arctic Cat C-TEC Engine Piston

The Arctic Cat C-TEC engine injects oil into the crankcase through a slot in the piston. This setup, according to Arctic Cat, improves performance, emissions and fuel economy.


AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oil

AMSOIL Signature Series Synthetic Motor Oils are formulated to meet the latest API SN Resource Conserving and ILSAC GF-5 industry specifications. AMSOIL Signature Series Oils include 0W-20, 0W-30, 5W-30 and 10W-30 and represent the very best motor oils AMSOIL has to offer, allowing motorists to take advantage of maximum extended drain intervals. AMSOIL Signature Series Synthetic Motor Oils are recommended for drain intervals of up to 25,000 miles/one year, whichever comes first (15,000 miles/one year in severe service conditions).

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Premium AMSOIL 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.


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AMSOIL Synthetic Diesel Oil Articles and Testimonials


"AMSOIL 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."


FULL WARRANTY


AMSOIL 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.


Another AMSOIL First

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.


THE NOACK Volatility Test
The NOACK 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 and emissions.

AMSOIL Now An ISO Certified Manufacturer
AMSOIL recently 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 industry.

ISO 9001:2000 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.

The ISO 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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