Originally Published: October 25, 2019.
More noises your engine makes (and what they mean)
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Intake : The piston (green) is pulled down inside the cylinder (gray) by the momentum of the crankshaft (gray wheel at the bottom). Most of the time the car is moving along, so the crankshaft is always turning. The inlet valve (left) opens, letting a mixture of fuel and air (blue cloud) into the cylinder through the purple pipe. Compression : The inlet valve closes. The piston moves back up the cylinder and compresses (squeezes) the fuel-air mixture, which makes it much more flammable. When the piston reaches the top of the cylinder, the sparking plug (yellow) fires. Power : The spark ignites the fuel-air mixture causing a mini explosion. The fuel burns immediately, giving off hot gas that pushes the piston back down. The energy released by the fuel is now powering the crankshaft. Exhaust : The outlet valve (right) opens. As the crankshaft continues to turn, the piston is forced back up the cylinder for a second time. It forces the exhaust gases (produced when the fuel burned) out through the exhaust outlet (blue pipe).
What's a police-spec one-off special? Well, remember when the LAPD got a Lamborghini Gallardo in 2014? That's the type of vehicle I'm talking about. But I'm not here to talk about the supercar that the LAPD got as a donation. The Gallardo is no longer in service. But here are a few special "interceptors" that still roam the streets.
How To Tell If Someone Put Something In Your Gas Tank.
Photo: Ford.
We're back into Ford territory with an even larger SUV, the Expedition. Initially developed after Chevrolet introduced a police version of the Suburban, the Expedition SSV is the largest Ford-badged police hauler that's not a van.
