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Discussion in 'Lawn Mowing' started by lawnshark2420, Oct 2, 2007.
Can someone please tell me what the difference is between the stihl 4mix and the regular?
The 4mix is a 4 stroke that uses mixed oil and fuel to lubricate engine parts. Unlike a 2 stroke that also uses oil mixed with gas, the 4 stroke normally has an oil sump. With an oil sump you cannot turn engine upside down so 4 mix idea came into play. The 4 mix engine is no different in operation then the engine of your car or lawn mower provided they are 4 cycle.
I believe these are also set up to meet California emmisions standards unlike many 2 cycle products.
google the term and it will take you directly to the stihl page about 4 mix.
the 4 mix have alot more pwer and are much quieter.
I really appreciate the info, thanks a bunch. I have a fc100 4mix edger and i love it. lots of power,low noise.
Just bought a FS100RX and love it. Time to buy another one
When you say 4-Mix run cleaner what are you referring to?
They run cleaner because buy design a 4 stroke is more efficient because a 4 stroke burns all of the fuel mixture intead of losing some of the mixture in the exhaust. It burns about half the amount of fuel (Engine sizes being the same) and has less emissions because the engine fires once every 720 degrees, and a 2 stroke fires once every crankshaft rotation (360 degrees).
4 cycle engines generally have to be larger displacement to equal the power of a 2 cycle.
They are more user freindly as well
Basically the 4-mix is a two cycle, four stroke motor that has valves instead of reeds.
What this means is the valve, exhaust set up allows for a much less quiet operation, which apparently you have noticed and the engine configuration means a broader torque curve as the torque of the engine design offsets the higher rpm of the reed design.
Regarding the "cleaner" exhaust emissions, the 4-mix powered equipment comes with a catalytic converter to make it CARB compliant - hence the "cleaner" moniker.
A point for thought, I much prefer the 4-mix motor set-up, I must as I own over thirteen pieces of 4-mix powered hand equipment and have more planned soon.