#ej247

The two names I have brainstormed are my two favorite car motors, Mazda’s 13B rotary engine and Subaru’s EJ257 engine. 

13B

The 13B is one of the very few rotary engines in the world. Rotary engines use a rotor in place of a piston on a traditional engine, each rotor housing can go through all three stages of combustion at the same time using the special triangle-shaped rotor. The rotor was held in a pinched oval shape which cause the rotor to spin in an elliptical manner, creating three sealed sections around each triangle point. Pictured above is a gif that shows each stage of compression for a single sealed section. This compact combustion system allowed for rotary engines to gain much higher horsepower without using larger engines. Rotary engines are a very unique piece of car history and Mazda history as well.

https://www.youtube.com/watch?v=4x04M8YwOBw

EJ257

The EJ257 is Subaru’s main performance engine. Originally put into their 2004 Impreza WRX STI’s, the engine is still used in STI’s to this day. The EJ engine has a unique “boxer” layout, where the pistons lay flat. “But isn’t that just a flat engine?” you might ask, but it is not! Flat engines have their pistons share a crank pin, causing them to move in the same direction. The boxer engine has their pistons on separate crank pins, causing the pistons to move back and forth at the same time. The boxer engine was much more stable, being used in 4 and 8 cylinder engines. The flat engine was used in 6 and 12 cylinder engines because those engines are naturally more stable. Pictured below are a boxer engine (top) and a flat engine (bottom). Notice the green pins and how that moves the pistons.