General Category > Oddball
A Good Bearing for Sinusoidal Piston Movement?
BillTodd:
You should be aware that , to keep the contra rotating , er, thingy - contra-rotating, there is a sideways force on the 'big-end' . This force is taken to the cylinder walls by the two pistons of the Esso-Cross engine , and would need to be controlled by something in your inline four design.
http://www.douglas-self.com/MUSEUM/POWER/unusualICeng/RotaryValveIC/RotaryValveIC.htm#esscross
BillTodd:
Another thought...
The two contrarotating contraptions are connected together in the EC engine . That allows both cylinder pairs to drive them in quadrature (at 90 degrees) preventing any dead spots that could jam an unconstrained thingy 8-)
Maat_Mons:
Wow, that Esso-Cross engine is pretty much exactly what I was trying to design. Well, except for how it uses a radial arrangement of pistons. And the fact that it uses rotary valves. But the eccentric spinny bits in the middle are spot on. I’m sad to hear they got less than half the predicted horsepower and then gave up. I wonder if it was down to too much friction?
Was “Esso-Dross” a pun or a typo?
I’m trying to get my head around that Stiller-Smith engine.
Maat_Mons:
YouTube's algorithm can be scary sometimes. One day after I make a post here about this engine design, my video suggestions contain an animation of the exact same design. If their algorithm were just slightly better, maybe they could have shown me that video before I made a post about it.
Actually, that guy's design is different from mine in a few ways. For one thing, he's using both a geared crankshaft and circle doohickeys. I only considered a geared crankshaft in the hopes of doing away with the circle doohickeys. I think his design would still work fine without the gear teeth. I mean, the Esso-Cross engine worked without any such thing, albeit at less than half the desired horsepower.
The same guy also has this video, which I really dig. Though, again, I don't think he needs those teeth. But man, that is a compact 8-cylinder.
A7er:
Maat_Mons
I just watched the video with the 8 cylinder. I wonder if the pistons would actually drive the crankshaft? It seems to my simple mind that this would work better as a pump, with the crankshaft driving the pistons. But then, the Wankel engine works OK!
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