![]() The two-stroke principle allows the inner mechanical parts to be well lubricated without the need for a separate oil sump, so it can be used at all angles without the worry of potential engine seizures. The more popular choice for petrol hand held tools is the two-stroke engine. It is also a cleaner and more efficient system as the valves control the entry of fuel and exit of exhaust. The key advantage of a four-stroke engine is that it produces more torque and power at a lower rev range, lending itself perfectly to tools such as backpack blowers and brushcutters. It is the amount of movement of the piston before combustion that determines if it is a four-stroke (2 up, 2 down movements) or two-stroke (1 up, 1 down). Both adopt the commonly described ‘suck, squeeze, bang and blow’ principle or, if you’re more technically minded, induction, compression, ignition and exhaust. Ultimately STIHL 4-MIX combines all the advantages of two different engine principles: two-stroke and four-stroke. The technology was developed to provide power and torque at a lower Revolutions Per Minute (RPM), with the added bonus of being extremely efficient due to low scavenging loss. Since 2002, the STIHL 4-MIX engine has been powering a range of petrol tools including brushcutters, backpack blowers, hedge trimmers, pole pruners and Kombi engines. ![]()
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