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Old 07-17-2013, 03:04 PM   #11 (permalink)
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the inherent dynamic imbalance looks a little troubling to me (compared to a boxer). more vibrations and/or rotating balance mass.

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Old 07-17-2013, 03:07 PM   #12 (permalink)
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I'm wondering how you would oil this engine, since gravity is working against you, how would you make sure the top side of the cylinder gets oiled properly and how do you get return oil back into the pan without getting on things that it shouldn't?

Also, what would a horizontal do to the efficiency of the engine as opposed to a vertical? Would the horizontal engine be able to turn the crankshaft (or whatever term) using less energy?

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Originally Posted by wdb View Post
It seems to me that the biggest benefit is that the cam's rotating masses cancel one another, which may make for a smoother running engine. (A six cylinder version would wipe that out of course.)
How would a six not be smooth like a 4? Wouldn't it still have a rotating mass to cancel each other out? I would think this engine design would be really bad with an odd number of cylinders, but not 6.
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Old 07-17-2013, 03:11 PM   #13 (permalink)
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the engine is out of balance in "yaw". An 8 cylinder could be balanced, but then the combustion chambers get pretty small and inefficient.
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Old 07-17-2013, 03:16 PM   #14 (permalink)
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The improvements are more subtle than obvious.

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Originally Posted by jakobnev View Post
What problem is this supposed to fix?
But they are of measured significance.

The engine does have improved dwell time at or around TDC allowing less ignition lead reducing the negative work of long lead engines due to pressure rise before TDC. Combustion is improved as it can near completion before the piston moves down significantly exposing the combustion gasses to cylinder quenching areas. The emissions profile is thus also improved.

The other advantage is packaging of the power plant. Long rod engines can improve dwell at TDC but have tall decks.

The combustion advantages will allow an engine of this design to approach the long rod diesel engines in Class 8 tractors, or maybe even the cross head engines in power generation diesels, in brake specific fuel consumption (BSFC). But, it will do so in a very compact boxer configuration that we can fit in cars and tricycles.
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Old 07-17-2013, 03:23 PM   #15 (permalink)
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Jeff, there have been many, many horizontal cylinder engines before this one came along- go look at your lawn mower. Cylinder lube is just fine.

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I would think this engine design would be really bad with an odd number of cylinders, but not 6.
It would be very, very strange if they ever thought of building this layout with an odd number of cylinders.
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Old 07-17-2013, 03:24 PM   #16 (permalink)
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Sytec used a balance shaft in their application.

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the engine is out of balance in "yaw". An 8 cylinder could be balanced, but then the combustion chambers get pretty small and inefficient.
I am quite sure this design would benefit as well.
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Old 07-17-2013, 03:27 PM   #17 (permalink)
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Reminds me of the DynaCam engine with circular cam lobes for a crank instead of a swashplate. Still reciprocating and using poppet valves, both of which are unnecessary.

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Old 07-17-2013, 03:30 PM   #18 (permalink)
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Chiron Free Piston Engine

Here is my current favorite.

regards
Mech
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Old 07-17-2013, 03:44 PM   #19 (permalink)
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Quote:
Originally Posted by RustyLugNut View Post
I am quite sure this design would benefit as well.
I mean for a given displacement, the 8 cylinder is less efficient than the 4.

Yes if it can reduce engine friction by %50 (which is 10-20% of engine only losses) that would be a 5-10% increase in efficiency in itself.

less moving "parts" is good too.

Not sure about the change in piston motion, how that plays out.

see also double acting scotch yoke:
Patent US20120272758 - Double-acting scotch yoke assembly for x-engines - Google Patents
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Old 07-17-2013, 03:54 PM   #20 (permalink)
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That is an interesting link.

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Originally Posted by Old Mechanic View Post
Chiron Free Piston Engine

Here is my current favorite.

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It deserves it's own thread.

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