The Creation(of rotational motion) through Chaos(Explosions!). That pretty much sums it up.

I have loved engines ever since I can remember. I used to draw them when I was younger. I was always trying to make vehicles that I could drive. I loved cars and I loved go-karts and model aircraft and buggies and, well, any vehicle with an engine.

In 1995 my dad bought me a 160cc ‘Briggs and Stratton’ engine from a Cash Converters in Subiaco. I remember having it running at idle on the brick path one day. It was vibrating all over the place like a crazed animal. It scared me a little but at the same time I was fascinated by it.

To me it was ‘alive’…..a living breathing collection of metals and chemicals engineered to convert stored chemical energy into fixed rotational motion.

To this day they still fascinate me and I have a great appreciation for them.

So, I decided to try my hand at crafting one in 3D. I started on it towards the end of 2012 and only just re-visited it today. There are several days worth of work in it at the current stage.

The result is a twin valve 4-stroke single cylinder internal combustion engine that I made entirely from my years of acquired knowledge of, and experience with engines. This is an interpretation of everything I have mentioned above and it’s still a work in progress.


Here is a brief rundown of an ‘Otto Cycle’ (4-stroke) engine as best I can remember:
A ‘stroke’ is the movement of the piston away from, or towards TDC(top dead centre) through a half turn of the crankshaft.
The cycle starts with the ‘Intake stroke’. As the piston moves down the intake valve opens and the fuel/air mixture is sucked into the cylinder. The intake valve closes as the piston begins to move up. This is the ‘Compression stroke’ where both valves are closed and the fuel air mixture is compressed by the piston. This is followed by the all important ‘Power stroke’ where the mix is ignited by the spark plug resulting in the rapid expansion of gasses forcing the piston to move down again and finally, the ‘Exhaust stroke’ where the exhaust valve opens as the piston moves up expelling the exhaust gases. The entire process then repeats. The 4-strokes of the piston make up a cycle.

I started from the inside out on this one. It still needs a lot of aesthetic work but the rigging and animation is completed. Hopefully I can continue to polish it up as I find the time.

All images and video remain the property of Chad Mulroney and may not be used without permission.