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2. Two-stroke oil - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_oil

   Unlike a four-stroke engine, the crankcase of which is closed except for its ventilation system, a two-stroke engine uses the crankcase as part of the induction tract, so 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]

3. Premixed flame - Wikipedia

   en.wikipedia.org/wiki/Premixed_flame

   The premixed flame interface propagates through the mixture until the entire charge is depleted. [1] The propagation speed of a premixed flame is known as the flame speed (or burning velocity) which depends on the convection-diffusion-reaction balance within the flame, i.e. on its inner chemical structure. The premixed flame is characterised as ...

4. Two- and four-stroke engines - Wikipedia

   en.wikipedia.org/wiki/Two-_and_four-stroke_engines

   The M4+2 engine, also known as the double-piston internal combustion engine, is a type of internal combustion engine invented by Polish patent holder Piotr Mężyk. [1] The M4+2 engine took its name from a combination of two-stroke engines and four-stroke engines. The two-stroke combustion engine is characterized by a simple construction and ...

5. Split-single engine - Wikipedia

   en.wikipedia.org/wiki/Split-single_engine

   Other split-single models from TWN were the 1954-1957 TWN Cornet (200 cc with 12 volt electrics and optionally electric starter), the 1953-1957 TWN Boss (350 cc) with 2 carburetors and the 1954-1957 Contessa scooter (200 cc). [1] The bulbous shape of the exhaust of the Cornet and Boss is an anti-noise two-stroke TWN feature.

6. Two-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_engine

   Oil is mixed in with their petrol fuel beforehand, in a fuel-to-oil ratio of around 32:1. This oil then forms emissions, either by being burned in the engine or as droplets in the exhaust, historically resulting in more exhaust emissions, particularly hydrocarbons, than four-stroke engines of comparable power output.

7. Opposed-piston engine - Wikipedia

   en.wikipedia.org/wiki/Opposed-piston_engine

   The latest (November 2021) version of the Fairbanks-Morse 38 8-1/8 is known as the FM 38D 8-1/8 Diesel and Dual Fuel. This two-stroke opposed-piston engine retains the same extra-heavy-duty design and has a rated in-service lifespan of more than 40 years, but now the optional capability of burning dual fuels (gaseous and liquid fuels, with ...