being an angry crier is the worst because people either feel bad for you or they think they won. like no. i’m gonna punch you in the jaw. i’m just crying i’ll still knock you down a peg.
Anonymous said: How do superchargers work? Just a bit curious
Ah. Forced induction. I don’t know how much background you want/need, but I’ll give you some. (Click on the pictures to make them bigger and easier to understand.)
A naturally aspirated engine (no super/turbo charger) draws air into the cylinders by the vacuum created when the piston is on its intake stroke - and just by normal atmospheric pressure. Which is great. Lots of cars are naturally aspirated, and you can still get a ton of power out of an NA motor. But using a supercharger or turbocharger changes the whole game.
There are a couple different types of superchargers. Positive displacement superchargers (Roots, and twin-screw styles) and centrifugal superchargers. The positive displacement type of supercharger sits directly on top of the motor. Air is brought in through the “top” of the supercharger, is compressed by the rotors/screws of the supercharger, and then FORCED into the cylinders, cramming more air into the cylinder than is possible with just atmospheric pressure. (Compressing the air makes it hotter and most people run some sort of an intercooler system to try and cool the compressed air before it actually goes into the engine - cooler air is more dense, and the more air you can cram into the cylinder, the more power you can potentially make).
The drawback to superchargers is that they are driven off of the crankshaft, which uses some power to create the extra power. In ^ that picture of a positive displacement supercharger, you see the pulley that the belt runs on. However, one of the positives of a supercharger is that you have almost instant power. There is no “lag.” You step on the gas, and boom!, you feel it. Newer superchargers have a bypass so that when you don’t need boost (when you’re just cruising down the road) you are more fuel-efficient. The more air you shove into those cylinders, the more gas you have to put in with it.
Centrifugal superchargers look more like a turbocharger, but again, they are belt driven, so it’s almost instant power.
This ^ is a Procharger (that’s the brand) supercharger. Looks like a turbo setup, but obviously belt driven. After reading the turbo description below, you can get an idea of how this operates. Instead of being powered by the exhaust, it’s run off a belt - sometimes the main drive belt, other times its own dedicated belt.
AND… just for fun I’ll describe turbochargers, too.
Turbochargers don’t really have a downside, besides maybe finding space for everything. They can have turbo lag, which is the time it takes for the exhaust gases to spool up the turbine, but that can vary depending on the size of the motor, size of the turbo(s), and whether or not the vanes of the turbo are variable. Sometimes a smaller turbo is “stacked” in “front” of a bigger turbo, so the small turbo spools faster, which then helps spool the larger turbo. Most people will do everything they can to eliminate turbo lag, because, well, to me at least, it’s annoying as hell. My family’s Passat has horrendous turbo lag. You step on the gas… and wait… and wait… and then suddenly the boost kicks in. My Subaru on the other hand, is not nearly as bad. It still has some turbo lag, but not much.
Turbochargers use exhaust gases to spin. The wheel on the exhaust side is spun by the exhaust gases flowing over it. There is a shaft that connects the exhaust side to the intake side. The blades on the intake side compress the fresh (outside) air, and then this compressed air is forced into your engine - again, typically through an intercooler setup.
Hopefully this helped explain forced induction to you a bit more! If you’ve got more questions, feel free to ask and I’ll try to explain them as best as I can!
Bringing this back because I can