Ambitious newby

[Gunny]

Uhm, isn't that what I was asking for help in doing? You
pretty much regurgitated what I already said with a large dose of negative
attitude. I'm asking what tools I should start out with and your answer is to
start out with my own tools? Does anyone have anything helpful to say? BTW
Inteligence = problem solving ability. Inteligent people are often mistaken for r
fools because the people watching them aren't smart enough to understand their
methods.

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[blackburn mark]

brett, its allways a good idea to let people have a look at your drawings so they can pull them to bits :) try not to take any criticism personaly... most of us have had a go at re-inventing the wheel and if nothing else, the attempt is fun and beats watching eastenders :)

your crank looks to have no meaningful counterbalance
your inner cylinder ports wont pull as much volume as your outer ports because of the con-rod obstruction (not sure if that would be a massive issue)
the crank will have a very small footprint in that slot (not sure if that will last long)

iv not seen a two stoke with injection, i think understand the issues you are trying to solve with injecting but im also assuming that the reason we dont see it is to do with the optimum injection timing being during induction so it would follow that the exaust port would still be open during injection and you would still be left with the old issue of raw fuel escaping before the exaust port closes (im sure two srokes are being phazed out for that very reason, terrible imissions)

im reasonabley sure you could machine most of those parts with a lathe & cnc mill (im not overly confident on your design at this point though)

[brsanko]

your crank looks to have no meaningful counterbalance
your inner cylinder ports wont pull as much volume as your outer ports because of the con-rod obstruction (not sure if that would be a massive issue)

I guess I assumed an opposed engine didn't really need counterbalance. If it does I have no idea how to design it. As far as the obstructed ports, I also don't really know if that would be an issue. I suppose I could flare the port and manifold on the inside chambers if I need to. I haven't put a lot of work into the crank design as of yet. I've only really been working intensively on the drawings a few months now so there are no details set in stone by any means. This is really just a concept drawing at the moment. I'm not saying I'm ready to get started building it. I'm just your average ADHD kid who needs to have 12 things going on to not get bored.

[m_c]

I guess I assumed an opposed engine didn't really need counterbalance. If it does I have no idea how to design it

The opposing piston/rod assemblies will counter balance each other, however the crankshaft itself will still have offset masses flying around at great speed unbalancing things.

[rnr107]

Hi brsanko,
Before starting building angine or anything else...First thing first...
How much space have you got available as a workshop?
What is your Machines + tools budget?
his will determine what machine you can buy...

If you've got anought space, get a bridgeport... You can get one for not too much money. And these are good!

RNR

[Tenson]

brsanko, I think the reason you are getting short attitudes is because your first post made a point of telling people how clever you are. Everyone on this forum is pretty clever and skilled, so if you want them to accept and help you, just need just show your are their equal in the quality content of your posts.

People are going to rip your design apart, and you probably don't even want that since you came here for machining advice, not engine advice. Still, if you know better about the design just ignore it and ask for what help you need.

[jcb121]

clever boy :)

That engine is pretty clever, using manual rods from the crank to open and close ports.

So the piston is connected to one or both of the valves? If you made the valves come off the piston at 90 degress then you could have one cylinder with two expansion strokes as you could have a combustion area on either side of the piston.

[brsanko]

clever boy :)

That engine is pretty clever, using manual rods from the crank to open and close ports.

So the piston is connected to one or both of the valves? If you made the valves come off the piston at 90 degress then you could have one cylinder with two expansion strokes as you could have a combustion area on either side of the piston.

Look at it again, there are no valves, only ports. There are already two combustion chambers per cylinder. The rods you see are the scotch yoke/connecting rod for the piston. Actually though if I had them go 90 degrees and then down I wouldn't have the difference in exhast flow on the bottom chambers.