Author Topic: feasability of a symmetrical engine?  (Read 326 times)

Online gipetto

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feasability of a symmetrical engine?
« on: November 19, 2023, 07:56:05 PM »
I was looking at a video of an antique briggs and stratton L head engine and wondered about what would happen if you had two custom L head engine blocks mated together, but oriented 180 degrees so that the valves in one block sit over the cylinder of the other block.
 
Then there would need to be a spark plug pointing up from the block near the valves.
Then the crankshafts would be geared together somehow, like a deltic or split single engine. I guess one camshaft would be different as one crankshaft would be turning the wrong direction, if you wanted them to balance that is.

I suspect it would be very high performance since the mass of the valvetrain is quite low, comparable with a modern single overhead cam, but with a vintage capable design.

Cost would be high due to the need for two cams and two crankshafts, but the components would be less, since there's no head. Not exactly a profitable design, but it is a curiosity to me.

Offline BillTodd

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Re: feasability of a symmetrical engine?
« Reply #1 on: November 19, 2023, 09:17:55 PM »
Like this ?

<a href="https://www.youtube.com/watch?v=zMsN8Dg5Md4" target="_blank">http://www.youtube.com/watch?v=zMsN8Dg5Md4</a>

Online gipetto

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Re: feasability of a symmetrical engine?
« Reply #2 on: November 19, 2023, 10:18:55 PM »
sort of, but that's a two stroke. i was thinking about a 4 stroke, and not supercharged.

Online gipetto

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Re: feasability of a symmetrical engine?
« Reply #3 on: November 19, 2023, 10:58:23 PM »
<a href="https://www.youtube.com/watch?v=fM3m6S0A56U" target="_blank">http://www.youtube.com/watch?v=fM3m6S0A56U</a>

I saw a comment on this one stating that they saw an engine like this on an older tugboat, but they were very labour intensive to work on so weren't popular. I guess that's all i wanted to know, that they did exist.

 

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