Hacker News Reader

There's potentially an even better option than the I6 layout: opposed piston I3 2 stroke. Same number of power pulses per rev as I6 4 stroke, no valves, no cylinder heads. It seems that these guys solved the oil loss problem and by using 2 injectors and some awesome combustion modeling they've been able to beat emissions standards without after treatment: https://achatespower.com

View on HN

This has been done before; heat and having two crankshafts kinda kills it

It's been done many times before, quite successfully. The Napier Deltic (3 crankshafts!) and Junkers Jumo are two examples. The Commer Knocker is another (which had only one crankshaft I believe). Two crankshafts makes the engine slightly taller, but not egregiously so.

I'd be curious to know more about the heat problem you've mentioned. Naively, there should be much less waste heat to dispose of due to the fact that the same cylinder volume is doing twice the work.

Reply on news.ycombinator.com