Summary 2 Stroke Oil Testing By Ken (BIG BIRD) WACO Brotherhood #70 Summary comments oil mixes and carbon formation: These tests were designed to simulate the effects of long-term high engine temperatures on the formation of carbon from the different two-cycle oils tested. The target temperature was 220 degrees F.

Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil, or 2-stroke oil) is a special type of motor oil intended for use in crankcase compression two-stroke engines.

Unlike a four-stroke engine, whose crankcase is closed except for its ventilation system, a two-stroke engine uses the crankcase as part of the induction tract, and therefore, oil must be mixed with gasoline to be distributed throughout the engine for lubrication.^[1] The resultant mix is referred to as premix or petroil.^[2] This oil is ultimately burned along with the fuel as a total-loss oiling system. This results in increased exhaust emissions, sometimes with excess smoke and/or a distinctive odor.

The oil-base stock can be petroleum, castor oil, semi-synthetic or synthetic oil and is mixed (or metered by injection) with petrol/gasoline at a volumetric fuel-to-oil ratio ranging from 16:1 to as low as 100:1. To avoid the high emissions and oily deposits on spark plugs, modern two-strokes, especially for small engines such as garden equipment and chainsaws, may now demand a synthetic oil and can suffer from oiling problems otherwise.

Engine original equipment manufacturers (OEMs) introduced pre-injection systems (sometimes known as 'auto-lube') to engines to operate from a 32:1 to 100:1 ratio. Oils must meet or exceed the following typical specifications: TC-W3TM, NMMA, [API] TC, JASO FC, ISO-L-EGC.

Comparing regular lubricating oil with two-stroke oil, the relevant difference is that two-stroke oil must have a much lower ash content. This is required to minimize deposits that tend to form if ash is present in the oil which is burned in the engine's combustion chamber. Additionally a non-2T-specific oil can turn to gum in a matter of days if mixed with gasoline and not immediately consumed. Another important factor is that 4-stroke engines have a different requirement for 'stickiness' than 2-strokes do.Since the 1980s different types of two-stroke oil have been developed for specialized uses such as outboard motor two-strokes, premix two-stroke oil, as well as the more standard auto lube (motorcycle) two-stroke oil. As a rule of thumb, most containers of oil commercially offered will have somewhere on the label printed that it is compatible with 'Autolube' or injector pumps. Those bottles tend to have the consistency of liquid dish soap if shaken. A more viscous oil cannot reliably be passed through an injection system, although a premix machine can be run on either type.

'Racing' oil or castor-based does offer excellent lubricity - at the expense of premature coking. Soul hunters tier list. For the average moped/scooter/trail rider it will not garner an appreciable increase in performance and will require very frequent teardowns.

Additive ingredients[edit]

Additives for two-stroke oils fall into several general categories: Detergent/Dispersants, Antiwear agents, Biodegradability components and antioxidants (Zinc compounds).^[3] Some of the higher quality include a fuel stabilizer as well.

See also[edit]

References[edit]

1. ^Nunney, Malcom J. (2007). Light and Heavy Vehicle Technology (4th ed.). Elsevier Butterworth-Heinemann. p. 7. ISBN978-0-7506-8037-0.
2. ^Smith, Philip H. (1965). The High-Speed Two-Stroke Petrol Engine. London: Foulis. pp. 236–237. ISBN085429-049-4.
3. ^'Archived copy'. Archived from the original on 2014-12-20. Retrieved 2014-09-24.CS1 maint: archived copy as title (link)

External links[edit]

Super Snowmobile 2T Motor Oil is a high detergent, low ash forming 2-stroke lubricant specifically formulated for snowmobile injector systems.Castrol Super Snowmobile 2T Oil, 1L:. Flows readily at temperatures to minus 40C thus ensuring no excess wear due to oil starvation. Can be used with the same confidence on pre-mix systems. 2-stroke lubricant specifically formulated for snowmobile injector systems. Meets the engine protection requirements of all makes of snowmobiles including those calling for API Service TC specification.