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Old 11-05-2020, 04:22 PM   #1 (permalink)
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No Connecting Rods!



I always liked the Scuderi Split Cycle engine but I thought it should be a boxer. What's popular with the cool kids these days in three cylinder/six piston opposed engines.

So maybe an opposed piston split cycle engine?

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Old 11-05-2020, 05:19 PM   #2 (permalink)
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Here is a four cylinder version. A flat eight?



It appears the stroke is ~.68 the bore in this instantiation.
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Old 11-06-2020, 12:22 PM   #3 (permalink)
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no connecting rods

If they can achieve a BSFC of 0.135 lbs / bhp, and zero carbon, they'll win all the marbles.
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Old 11-06-2020, 12:36 PM   #4 (permalink)
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Youtube also recommended this video to me. I thought it was interesting.
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Old 11-06-2020, 01:08 PM   #5 (permalink)
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Compare the Achates Power solution. Two crankshafts, one combustion chamber vs one crankshaft, two combustion chambers.
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Old 11-06-2020, 02:53 PM   #6 (permalink)
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I do wonder how much friction or how quickly those gear mechanisms will wear. Seems like a lot of force with very little movement distance.
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Old 11-06-2020, 11:26 PM   #7 (permalink)
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Seems quite unpractical. Any increase to stroke would also be dependent on an increase to the bore too.

Even though the Achates Power design requires conrods and two crankshafts, it doesn't require a valvetrain which adds complexity. Not to mention the Achates Power doesn't require head gaskets, and the absence of actual cylinder heads is also claimed to decrease thermal losses.
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Old 11-06-2020, 11:33 PM   #8 (permalink)
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Quote:
....the absence of actual cylinder heads is also claimed to decrease thermal losses.
Thanks. I think that's what I was looking for.
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Old 11-06-2020, 11:57 PM   #9 (permalink)
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Is it just me, or does anybody else sees some resemblance of its crankshaft with the one of a Wankel?
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Old 11-08-2020, 03:33 AM   #10 (permalink)
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Not sure why this is us in the unicorn gallery. I don't see any ridiculous claims being made, but it seems like a novel and compact arrangement.

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