Saw Fuel Comsumption

[Crofter]

Glen I do it deliberately to pith you off and it IS difficult to keep a straight face meanwhile! Can you please supply us with a list of your pet peeves? Lol!

 

[DanMan1]

Glen,
That's it. I'm tired of this thread and I'm going outdoors.
Well, technically I'm going outside. I probably won't pass through more than 1 door as the word 'outdoors' implies more than one door. As a matter of fact, I may not even go through any doors at all on my way out. Maybe I'll just plop out of a window.
Just kidding around ya-know

 

[Crofter]

Is the pipe for the 066 giving as high a percentage of power increase as the one on the 026. In some of the tuned pipe theory articles, a pipe can be used to increase economy but that doesn't usually go with narrow band maximum output.

 

[timberwolf]

The 026 pipe is giving 30% or more and the 066 pipe only 20% but I would have to recheck as I have changed sprockets and chains since last timing cuts.

 

[glens]

That was great, DanMan!

I would expect all things being equal, that a piped saw would use less fuel to do more work.  You're not just blowing it out the exhaust, but are instead pushing it back in.

I realize a lot of manufacturers use the term "2 cycle" but that doesn't make it any less meaningless and in fact makes me question their credibility.  I wouldn't be surprised in the least to find that while the marking department uses the term the engineering department does not.

Qualifying the term "cycle" as a piston-cycle (and/or crank-cycle), a four-stroke engine is a 2 cycle and a two-stroke engine is a 1 cycle.&nbsp; Qualifying the term "cycle" as an engine cycle, they're all 1 cycles.&nbsp; If the term "cycle" refers to the number of <i>functions</i> performed during a crank cycle, then a two-stroke engine is a 4 cycle and a four-stroke engine is a 2 cycle.

I'll stick with 4-stroke and 2-stroke so you all can know without a doubt what I'm talking about.

Glen

 

[Crofter]

Glen if I remember what I was taught, the cycle is one complete evolution of the things necessary for continuous operation of a gasoline engine; namely intake, compression, ignition and power, exhaust. A stroke is a piston stroke in one direction. The common auto engine is a four stoke cycle engine and a saw is a two stroke cycle engine. The first completes the cycle in two crank revolutions and the latter in one crank revolution by combining more than one operation with each stroke. You are correct in saying that they are not two or four cycle engines, but is the audience any the wiser or are we quibbling again!

 

[glens]

One can only hope it'll sink in, but then again, 10,000 Frenchmen can't be wrong?

 

[spacemule]

It sure would be nice to have electronic fuel injection after exhaust closing and avoid the loss. Don't know how far they are away from having units that would work on a saw. Outboards are using it, but the weight and size of the electronics would not be near the handicap there. It sure has improved the efficiency and dependability of auto engines, but it did take a few years to get the bugs out.

The technology already exists. Check this out. If they have efi on an engine with a total weight of less than 2 lbs., they can put it on saws.

 

[spacemule]

To me a "cycle" denotes the return to a starting point and all that happens in the mean time. If the engine cycle (intake/compression/combustion/exhaust) requires 2 strokes of the piston it's a 2-stroke-cycle engine and if it requires 4 strokes of the piston it's a 4-stroke-cycle engine. For the former, there's one cycle of the crankshaft and for the latter, two cycles of the crank.


Glen

I had a 3 cycle when i was a young kid. I didn't get a 2 cycle until I was older.

The whole argument hinges on the definition and application of "cycle." If defining cycle to include <i>only</i> start/stopping motion of the piston, then saying 2 cycle engine is correct, as there are 2 start/stop cycles before the repeating event restarts. Granted, these cycles are not equal since each direction serves different functions, but this is a moot point if we limit our "cycle" to only include start/stop motions. I couldn't care less. What gets on my nerves is "pin number" or people who call "realtors" "realItors."