Anatomy of a Cylinder
Before we see it move, let's understand the parts. Every internal combustion engine shares these fundamental components from a lawnmower to a superbike.
The Four-Stroke Cycle
Every cylinder in every engine follows this sequence. Intake, compression, power, exhaust, over 720° of crankshaft rotation, four strokes, one complete cycle. This is the heartbeat.
Piston moves down, intake valve opens, air-fuel mixture enters
The Parallel Twin
Two cylinders side by side. Compact and balanced, but the firing order determines everything about its character.
Uneven firing. The "big bang" feel. Modern standard.
Click the engine to pause
The V-Twin
Two cylinders in a V. The angle between them (45°, 60°, 90°) defines the engine's soul. Harley's 45° rumble. Ducati's 90° smoothness.
Perfect primary balance. The L-twin.
The Boxer Twin
Two cylinders lying flat, opposing each other. BMW's signature layout since 1923. Perfect primary balance, low center of gravity, and unmistakable character.
The adventure benchmark. ShiftCam variable timing.
Horizontally opposed cylinders cancel primary vibration. Low center of gravity.
The Inline Triple
Three cylinders in a row. The best of both worlds: more torque than a twin, smoother than a four, with a unique exhaust note that's instantly recognizable.
MotoGP-derived triple. 180hp.
Three cylinders with 120° spacing. The perfect balance between twin torque and four-cylinder smoothness.
The Inline Four
Four cylinders in a row. High-revving, smooth, and screaming. The sportbike standard since the CB750 changed everything in 1969.
Outer pistons (1 & 4) move together. Inner pistons (2 & 3) move together.
The 180° crank creates smooth, even power pulses, perfect for high revs.
Firing Order
When each cylinder fires relative to the others creates the engine's rhythm. Same hardware, different timing, completely different sound.
brap-brap . . brap-brap
Examples: Aprilia RS 660, Yamaha MT-07, KTM 890 Duke