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Old 07-21-2015, 01:44 PM   #1
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Honda going 2 strokes again

http://www.gizmag.com/honda-two-stro...-filing/38529/
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Old 07-21-2015, 02:14 PM   #2
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I agree with the last part of the article, it looks like a long stroke, heavy built engine. Maybe a generator or something.
It makes sense that in a generator they could tune for best efficiency at a narrow range of RPM and a 2 stroke would make a lot of power for a given displacement.

Seems like with all the computer controls that have been developed since the last time 2 strokes were common on the road, they could make them meet the emissions standards. Outboard motors are out there.
I know the standards are different, just saying it's not like 2 stroke developement has been completely stagnant.
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Old 07-21-2015, 03:29 PM   #3
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Most likely not for motorsport use. The output shafts look like it's for industrial or general purpose small engine (lawn care, water pump, generator, etc.):

honda patent fuel injected 2 stroke engine 4@2x
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Old 07-21-2015, 07:03 PM   #4
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now if they could figure out how to make detroit diesels direct injected, oh wait they already are.

pretty cool though.
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Old 07-21-2015, 07:15 PM   #5
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There is actually a lot of interst in bring back two strokes as range extenders for electric vehicles. Lightweight small packages, etc. The more interesting thing with this one is the crank. The patent says that it allows for adjustable compression ratio so it can run any fuel from diesel to LP gas.
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Old 07-22-2015, 05:16 AM   #6
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Quote:
Honda states that "the two-stroke engine is often preferred over the four-stroke engine in the field of general purpose engines because of the simplicity in the structure."

Furthermore, that diagram would seem to show a long-stroke engine with a pushrod valve system and a thick mounting at the bottom. In addition, the patent wording states that "the liquid fuel may consist of diesel oil or any other fuel that is provided with a lubricating property." All of which points toward an industrial generator-type machine rather than a high-performance motorcycle engine.
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Old 07-23-2015, 03:03 PM   #7
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Why does it have an OHV? Doesn't that defeat the purpose of less moving parts?
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Old 07-23-2015, 04:06 PM   #8
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Quote:
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Why does it have an OHV? Doesn't that defeat the purpose of less moving parts?
Simplicity of maintenance and cheap to manufacture, would be my guess.
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Old 07-23-2015, 05:43 PM   #9
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OHV pushrod engines do have less moving parts. OHC needs belt/chain/gear and cam shaft, all of which move.

What a pushrod system has more of, typically, is reciprocating mass in the valve actuation mechanism. This limits the RPM of the engine, which usually is not a concern with these industrial/agricultural engines.
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Old 07-24-2015, 10:39 AM   #10
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Quote:
Originally Posted by Volfy View Post
OHV pushrod engines do have less moving parts.
Than a typical small 2 stroke with no valves and just an exhaust port?
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Old 07-24-2015, 01:56 PM   #11
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Quote:
Originally Posted by False View Post
Than a typical small 2 stroke with no valves and just an exhaust port?
They are trying to make it as efficient as possible.
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Old 07-24-2015, 06:39 PM   #12
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Quote:
Originally Posted by False View Post
Than a typical small 2 stroke with no valves and just an exhaust port?
Of course not. The classic 2stroke with crankcase induction and cylinder ports is still the king of low parts count and minimum moving parts. My trust ol RC glow engines breaks down to a handful of parts... literally.

However, increasing EPA restrictions is making 2smokes unfeasible even for small industrial and agri engines. That is why a lot of lawn care engines are 4 stroke these days, but there can be heavier, less powerful and costlier to mfr. By using valves to limit blowbys and control timing more precisely, Honda is trying to make a 2stroke able to meet EPA but still have the power advantages of a 2stroke.
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