# Multiple crankshaft engines

**URL:** <https://community.cartalk.com/t/multiple-crankshaft-engines/178173>\
**Category:** General Discussion\
**Created:** [July 21, 2021, 6:19pm UTC](https://community.cartalk.com/t/multiple-crankshaft-engines/178173 "2021-07-21T18:19:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [July 21, 2021, 6:19pm UTC](https://community.cartalk.com/t/multiple-crankshaft-engines/178173/1 "2021-07-21T18:19:44Z")

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I happened across this video about some fanciful engine designs and thought I’d share:

[![](https://global.discourse-cdn.com/cartalk/original/3X/0/d/0d2610afb869b4c51e8eb80060de2c5787a3eb30.jpeg "The Legendary Napier Deltic - 88 Litre Opposed 2-Stroke Triangle Engine") ](https://www.youtube.com/watch?v=-vV-YaKsIGk)

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [July 21, 2021, 6:43pm UTC](https://community.cartalk.com/t/multiple-crankshaft-engines/178173/2 "2021-07-21T18:43:28Z")

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Interesting! Here’s a bit smaller one, only two crankshafts:

[![](https://global.discourse-cdn.com/cartalk/original/3X/a/3/a371e464bd33ab4f0d28919ef0b4a988631220a7.jpeg "Ariel Square Four Engine Overhaul") ](https://www.youtube.com/watch?v=QwC9a2DPMiw)

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**Author:** ![B.L.E](https://avatars.discourse-cdn.com/v4/letter/b/848f3c/32.png) [@B.L.E](https://community.cartalk.com/u/B.L.E)\
**Post date:** [July 22, 2021, 10:36am UTC](https://community.cartalk.com/t/multiple-crankshaft-engines/178173/3 "2021-07-22T10:36:31Z")

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Here’s one way to achieve the uniflow scavenging of an opposed piston two stroke engine while only using one crankshaft.  
 ![image](https://global.discourse-cdn.com/cartalk/original/3X/9/1/91a4a95b66ecae6a618a5b527660b54242d0715d.jpeg)

I actually was able to take one of these out on the road for a short spin. Lots of vibration, and it wasn’t exactly a rocket ship. But these did have a reputation for getting good gas mileage.