Monolith Engines have yet another take on the ICE engine.

Continuing on with another alternative to the traditional reciprocating Internal Combustion Engine (ICE) engine from last Friday, Monolith Engines have put 2 pistons into 1 cylinder. The goal with this arrangement is power density and reliability. The pistons move to meet one another in the middle of the cylinder, making this a completely balanced engine and the only real rival to a I-6 (Straight 6) and it’s beautiful, inherent primary balance.  This makes me think of the square-fours used first by Ariel, and then Suzuki in the 80’s, but only because of it’s boxy shape.


About Dandooligan

Dandooligan CO, United States Every ride spurs the yearning for another and as such, has pushed me to adopt the riding lifestyle and all of it's challenges. This blog concerns those challenges from bikes to gear, media about bikes, and maybe even some psychology/sociology on the subject as well. Dandooligan, a mash-up of Dandy and Hooligan, both very important parts of me and my outlook on life. I'm also known as Spooph


  1. This is pretty fabulous. It makes so much sense. I hope these guys get rich.

  2. Walter The Mercer

    Hmmm, I’d have to see a running example before I would believe the claims about HP and Max RPM*. I do see this as a really good design for alot of the engines that power pumps, generators, and similar, especially if it is fairly fuel efficient. I do see that they have increased driveline losses based on all that mass being moved back and forth as well as all of the points that contact other points. But losing the vibrations can be a really good thing for some types of installations. It may even make sense in the Hybrid vehicle sense if you aren’t using the motor for direct drive (therefore not needing to add in all the transmission junk).

    * The max RPM they talk about isn’t really outside the capabilities of a standard Auto engince (much less motorcycles!). The limiting factor for most engines getting above 10k RPM is not the crank to piston part, it is the valves. Building a car motor for 10k+ RPM’s is not trivial with the current cam and valve setups. Can it be done? Yes. Expensive to build and/or maintain? Pretty much. Can’t wait for hydraulic or electric valves to become common on something other than F1…

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