There is very little difference in 50:1 and 40:1 fuel mix. 50:1 and 40:1 fuel mix will operate in all fast R.P.M 2-cycle engines. These are speeds of 5,000 RPMs and faster. Most string trimmers and blowers run at 8,000 to 10,000 RPMs.
Refer to the chart below to make sure you're using the correct 2-cycle fuel and oil mixture:
|Mixing Ratio (Gas:Oil)||Volume of Gasoline||Volume of 2-Cycle Oil|
|50:1||1 US gal. (128 oz)||2.6 oz.|
|32:1||1 liter||31.25 ml|
|40:1||1 liter||25 ml|
|50:1||1 liter||20 ml|
4 cycle engines do not need oil mixed with the gas to provide lubrication, since it has oil in the crankcase. Two cycle engines have to have oil mixed in the gas to provide the lubrication needed, since there is no oil in the sump. Even running the motor lean on oil or fuel mix can and will damage a piston/cylinder.
The gas/oil ratio (GOR) is the ratio of the volume of gas that comes out of solution, to the volume of oil at standard conditions. They go on to define an oil well as having a GOR of less than 5 MCFG/BBL and an oil and gas well between 5 and 20 MCFG/BBl.
Two-stroke oil (also referred to as two-cycle oil, 2-cycle oil, 2T oil, 2-stroke oil or petroil) is a special type of motor oil intended for use in crankcase compression two-stroke engines.
A two-stroke (or two-cycle) engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution.
TruFuel is the first-ever premixed, ready-to-use fuel engineered specifically for portable, 4-cycle gas-powered equipment, providing time-saving convenience and superior performance. The 4-Cycle Ethanol-Free Fuel ensures easier engine starting and smoother idling in a safe, reliable formula.
A 4 stroke engine is an internal combustion engine wherein each piston has 4 distinct strokes it must take as part of its cycle. A 4 cylinder engine has 4 cylinders, each with its own piston. Strokes and cylinders do not necessarily have to be correlated in any way.
A 2 cycle engine completes a combustion and exhaust cycle in only 2 strokes of the piston, with a 4 cycle taking 4 strokes of the piston. This means that the combustion of the fuel mixture needs to impart enough power into the piston to allow it to rotate the crankshaft twice.
A two-stroke, or two-cycle, engine is a type of internal combustion engine which completes a power cycle with two strokes (up and down movements) of the piston during only one crankshaft revolution. This is in contrast to a "four-stroke engine", which requires four strokes of the piston to complete a power cycle.
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction.
Two Stroke Engine
- Intake. The fuel/air mixture is first drawn into the crankcase by the vacuum that is created during the upward stroke of the piston.
- Crankcase compression. During the downward stroke, the poppet valve is forced closed by the increased crankcase pressure.
Because 4-stroke engines have a built-in lubrication system with oil being held inside the engine and pumped through it under pressure to feed the bearings, cylinder walls etc. 2-stroke engines do not have this so the simplest way of providing the lubrication is to have the oil mixed in with the fuel.
|Gasoline||STIHL Premium two-stroke engine oil 1:50|
Automakers have filed a lawsuit against the EPA's decision to make E15 (gasoline with 15 percent alcohol) legal for all cars after 2007. They argue that, among other problems, the blend could damage the engine. Just about every gallon of gas pumped today contains as much as 10 percent domestically produced ethanol.
Gas mileage decrease. One of the bad things that happens with ethanol is that your mileage will actually decrease. The New York Times stated that E10 gasoline, which is the gas we use in America, actually gives you 2-3 miles per gallon less than gasoline. E85 is a flex-fuel with 85% ethanol loses 7-8 miles per gallon.
Even though ethanol is very commonly used, it is a dangerous chemical. As previously mentioned, it is highly flammable; as such, it has exact flash points which are important to know when using it. While ethanol is consumed when drinking alcoholic beverages, consuming ethanol alone can cause coma and death.
That's why hospitals use lots of alcohol to kill germs. So consuming a little (almost) pure ethanol will not kill you per se, but it should be diluted for inclusion in alcoholic beverages. You wouldn't have to consume much of it to approach the level in your body for alcohol poisoning.
Fire fighting materials should always be readily available for use when needed, although large fires should be left for professional fire fighters. Ethanol spills may be cleaned up by soaking into a cloth or paper towels, then washing out the cloth and wiping down the area with a wet cloth.
Things That Should Never Go Down the Drain. These materials should be disposed of in properly labeled liquid waste bottles. There are a few organic solvents, such as ethanol, which can be disposed of down the drain.