Open Source Piston Engine Conceptual Design
- This page is focused on pre-dev research on the Open Source Piston Engine
- The Youtube Channel "Engineering Explained" has great information, and explanations on all sorts of engine related stuff, especially developing technologies
- Diesel Exhaust Pollutants
- Exhaust gas recirculation - reduces peak in-cylinder temperatures, reducing NOX 
- Catalytic Converter
Piston/Combustion Chamber Layouts
- Electronic valves - eliminates need for camshaft and rockers, allowing higher simplicity, and 30% efficiency gain.
- DIY campless - 
- Camless engines are not yet available, outside of some large diesels.  -from 2016, is this still relevant, looking into this right now
"Previous fully variable valve actuation engines use either electro-magnetic or electro-hydraulic to open the poppet valves.
Instead of using these actuator types, Freevalve uses electro-hydraulic-pneumatic actuators combined with advanced sensor techniques.
As a result, Freevalve has overcome all of the typical challenges faced by other cam-less techniques."
- Free piston engine - drives a working fluid directly, without crankshaft XMpP&sig=Ajz06elbtD8LeNBc7NGlPnsvD8o&hl=en&sa=X&ei=bRAUVcvXAcHlUraEhLAO&sqi=2&ved=0CF0Q6AEwDA#v=onepage&q=stelzer%20engine&f=false</ref>
- Free piston engine linear generator (FPEG) - 
- Hydrogen-powered linear generator is reportedly as efficient as fuel cells - . Discusses linear generator configuration fired on both sides. Also discusses compression ignition of non-diesel fuel - via homogeneous (premixed) charge - (HCCI) . Peter Van Blarigan, Sandia Labs
- Stelzer engine - 2 opposing combustion chambers with middle pumping chamber. . Pertinent popular references -
- Uses pre-mixed fuel-air (via external/port injection, with ignition solely due to pressure + temperature increase)
- Main challenges seem to be
- Making the precise "mix"
- Keeping the engine temperature in the proper zone, as too hot causes premature ignition (knocking)
- Conventional Gasoline (spark ignition_
- Diesel (Compression, flame triggered via fuel addition)
- Homogeneous charge compression ignition -