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There was a fuel injected 461 circuling Europe a while back.. Edit. Not sure were the pic's are, I try find them again..

The 461 is fuel injected right? Same as the cut off saw? Electronically controlled carbs is less than half way, fuel injection is the way to go. Jonsered were on the right track 60 years ago with fuel injected saws.

I looked up these animations, thought it could be fun for some to see.. Stratro: http://www.youtube.com/watch?v=3LDN0c2lAsQ&feature=relmfu X-torq: http://www.youtube.com/watch?v=IY7zQKw4qsQ&feature=related Conventional: http://www.youtube.com/watch?v=LuCUmQ9FxMU Conventional...

I don't understand the fan thing... It is pressures (+-)that make the gases flow, crank is of no use in this, quite the opposite really as it can restrict flow. Solution to this was the "full circle cranks" but they reduce volume in case witch is needed to get a larger amount of fumes in until...

Not in any way different than what has been used in conventional engines. It can not have both ports open at same time any more than it can brew coffey. This is possible, although it doesn't say it is very likely or functional... The flow scheme is about the timing and pressures. Not so easy...

This is how the conventional engines work and have been for decades.... Like 357, 272, 372.... NOT like the X-Torq, strato engines they spent millions on and arguing environmental reasons.... Mental, yes, but has nothing to do with environment. Marketing and emission race that we get to pay.......

No, if exoust is open when intake port is open the fumes go straight thru. It can't work that way. Pressures take out eachother and it will not run. I did this a couple of times porting... Just to throw thr top end away and start over. Stratifyed and X-torq all mean that it should not be...

The cut out is likely to not restrict flow up thru port in front as it is in BDC.

If it takes air in from muffler it is not fresh, it is hot and burned.... That will not work as desired... Very counter productive. If it does it will still just neutral the pressure as piston open port, not something you wish to happen when the pressure is negative and fuel air is sucked in at...

It could very well be this saw is meant to have another cylinder in another version or something, but I would still like to know what is what. I find it really strange that no one can explain...

If you look at cylinder base it will not allow any flow as cylinder cover the cut outs that are there in case as for a saw with open ports. Piston is ported as if it were used for closed ports, so gas air mix go thru it. Here the fumes have no place to go from piston and out as there are no...

Nah, this looks to me like a normal engine with front transfers. I can't see anything special or new other than bracket that is mounted opposite transfers...

"Evidently it sucks air into the bottom intake ports"... From were does it suck the air?? Is this what you mean: http://chainsawrepair.createaforum.com/stihl/stihl-ms461/15/...

This makes no sense to me.. http://en.stihl.ca/STIHL-Products/Chain-saws-and-pole-pruners/Gas-chain-saws-for-forestry/22101-130/MS-461.aspx "2-stroke engine with stratified charge. A fuel-free layer of air is created between the burned charge in the combustion chamber and the fresh charge in...

As I see these pic's, there is only one port in, that is thru carb. No fresh air going in. This old transfer design is better in many way's, but it is not piston ported, so I don't see why piston is ported.... If there was a meaning to that it would need a lower transfer port were it go thru...

What I call fresh air engines is the type of engine that has a port for air (without fuel) to flush out after combustion and reduce amount of unburnt fuel going out and back in. These transfers are for letting the gas/air mix up above piston. Not much special. The design has been avoided on saws...

Is it it a fresh air engine or conventional?

For it to be a fresh air engine with "good emissions" as they say it needs another intake for fresh air, without fuel. Were is the fresh air coming in the case then? Fuel/air mix seem go straight in to case, this is normal. It is no "full circle crank so it has good crank case volume that will...

I looked again and no, I don't get it. Either this is a normal combustion engine or I am missing something.

This looks like a normal engine. No fresh air port... Edit... I see it now... This looks like it might actually work.