Professionals know that professional machines and equipment are needed in order to deal with the jobs arising in different applications effectively and conveniently. For this reason, STIHL has not concentrated on just one engine technology, such as 4-stroke technology, for it is always nothing more than a compromise. Instead, STIHL has for many years consistently developed its 2-stroke engines for individual requirements. Read on and find out more about the properties of modern 2-stroke engines from STIHL:

Full power and not a gram too much - good power-to-weight ratio

The 2-stroke engine consistently meets with all the basic STIHL principles: maximum power with minimum weight. Due to its compact design, that means up to 20 percent more power with the same displacement as a conventional 4-stroke engine and 30 percent lower weight.

Less maintenance required

Mixture-lubrication makes the STIHL 2-stroke engines exceedingly easy to service. There is no need for maintenance of the separate fuel supply and engine lubrication as required in conventional 4-stroke engines.

All-position operation

Unlike 4-stroke engines, which can normally only be operated in one position on account of the separate oil circulation and engine oil reservoir, STIHL 2-stroke engines are reliably lubricated by the fuel mixture in absolutely every working position. They can consequently also be mounted in the most space-saving position.

Optimized combustion

Overflow ducts and ports ensuring optimum flow conditions increase the filling capacity of the combustion chamber and consequently also improve the combustion process. This not only leads to a tangible increase in performance, but also to better emission values and lower fuel consumption.

STIHL 2-stroke engine with catalytic converter

The STIHL 2-stroke engine with catalytic converter displays the same advantages as its 2-stroke counterpart without converter. However, the catalytic converter additionally reduces the unburned constituents in the exhaust gas, thus reducing hydrocarbon emissions by up to 80%. The catalytic converter is maintenance-free and has no effect on the engine's all-position operation.

STIHL 2-stroke engine with stratified scavenging

2-stroke engines with stratified scavenging will also be used in future. This principle imposes a fuel-free layer of air over the ignitable mixture, resulting in a fuel-free scavenging loss and reducing fuel consumption.

Conclusion:
STIHL 2-stroke engines are superior to conventional 4-stroke engines as regards the advantageous power-to-weight ratio, high torque over a large speed range, compact engine with few components, low maintenance requirements and easy servicing. The basic design principle is the only thing that today's consistently improved 2-stroke engines from STIHL have in common with the first generation of 2-stroke engines and their high intensity of emissions.