Weed eaters , also call trimmers , are market with 2 - stroke and 4 - separatrix gasoline locomotive engine . Each has its supporters , but generally speaking weed eaters with 2 - stroke engines are cheaper , lighter and more powerful than eaters with 4 - stroke engine ; they also make more haphazardness , vibrate more , emit more pollution , break out more quickly , and you have to mix in oil with the accelerator . develop EPA befoulment necessary favor 4 - slash locomotive .
Engine Differences
The condition " stroke " refers to the movement of the Walter Piston in the piston chamber of an engine . In a 2 - stroke engine , compressed fuel explodes , pushing the piston outwards ; fuel is insert into the piston chamber as the piston return . A 4 - stroke engine has freestanding strokes for compression and exhaustion . A distributor on a 4 - stroke locomotive engine supplies a discharge every 2nd turn of the crank pecker when the piston is close to the top idle center of the densification stroke .
Fuel and Power
You have to coalesce about 4 oz . of fossil oil for each gallon of gasolene for 2 - stroke engine . Two - throw locomotive engine deliver more superpower for their size of it than weed eaters with 4 - stroke engines ; they are also more difficult to commence than 4 - stroke engine .
Cost
The simple intent of 2 - stroke locomotive engine think they are cheap to cook up , so the monetary value is less to the consumer . The oil that you coalesce with the gasolene in a 2 - stroke railway locomotive can be expensive , plus 2 - stroke engine practice more gas than 4 - CVA locomotive engine .
Maintenance
Two - stroke engines do not have a separate lubrication system as more advanced 4 - separatrix engine do ; they bank instead on oil color mixed with fuel , so their move parts outwear out faster than those in 4 - stroke engines . This means they are more expensive to sustain . If you add too much oil to the fuel mixture of a 2 - stroke locomotive , the engine will become sluggish and bullet will belch from the muffler . If you do n’t sum up enough oil , your railway locomotive will run hot and can burn out .
Pollution
Part of the mixture of tune and fuel in a 2 - fortuity locomotive leaks out through the exhaust port as it is loaded into the burning chamber . This is one germ of exhaust system emissions in 2 - stroke engines that are a source of concern for the Environmental Protection Agency . The EPA discourages 2 - fortuity engines , which it considers heavy defiler , and advance 4 - apoplexy engine , which foul less .
