When you’re reading about cars, you’re going come run into engine specifications, i.e. A 2.0 liter 4-cylinder turbo developing 160 horsepower and 175 lb-ft the torque. Cylinders? Torque? What do all those number mean? That’s the subject of this aufdercouch.net university lesson.

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A cylinder is the strength unit of one engine; it’s the chamber wherein the petrol is burned and also turned right into power. (For more on what walk on within the cylinders, see just how Engines Work.) most cars and also SUV enginess have four, six, or eight cylinders. Generally, one engine with an ext cylinders produces an ext power, if an engine through fewer cylinders gets better fuel economy.

Cylinders will either be arranged in a straight line (an inline engine, i.e. “inline 4”, “I4” or “L4” ) or in 2 rows (a V engine, i.e. “V8”).

DISPLACEMENT (Liters and Cubic Inches)

Engines are measured by displacement, typically expressed in liters (L) or cubic centimeters (cc). Displacement is the full volume of all the cylinders in an engine. One engine with 4 cylinders that 569cc each totals 2276cc, and will be rounder off and referred to together a 2.3 liter engine. Larger engines tend to produce much more power — specifically more torque (see below) — but use more fuel.

Up till the early on 1980s, engines were measured in cubic inches. One liter equals around 61 cubic inches, therefore a 350 cubic inch engine is around 5.7 liters.


A turbocharger is a device that is provided to boost the strength of one engine. A four-cylinder engine v a turbocharger can develop as lot power as a six-cylinder engine, however uses less fuel when driven gently. (For much more information, see exactly how Turbochargers and Superchargers Work.) Engines with a turbo sometimes obtain a T after their displacement; “2.0T” denotes a 2-liter engine v a turbocharger.


Horsepower and torque measure the quantity of power an engine develops, v horsepower being the many commonly-used measurement. The difference in between horsepower and also torque is commonly misunderstood (and complicated to explain).

Torque, which is measure up in pound-feet (lb-ft or ft-lbs), measures pulling power; once you step on the gas pedal and the chair pushes into your back, you room feeling torque. Trucks need numerous torque to obtain their hefty loads moving. Speech is a function of torque and also engine speed (RPM), and indicates just how much sustained work-related the car can do. Gyeongju cars need high speech to maintain high speeds. Generally, bigger-displacement engines develop more torque, but tiny engines have the right to spin faster, which rises their speech output.

A automobile with high horsepower yet low torque might feel sluggish from a stop, however will feel stronger as the engine spins faster and faster. A high-torque, low-hp engine will accelerate strongly from a stop, yet will follow off as the engine accelerates (until the transmission shifts gears).

Horsepower and torque dimensions are “peak” numbers; a 180 horsepower engine will certainly only develop 180 horsepower at a details engine speed — say, 6,000 RPM. At other speeds, the engine creates less horsepower. The same goes for torque, although some engines (especially those v turbochargers) have a continual peak-torque range, developing their rated speak between, say, 1,800 and also 4,000 RPM. One engine with strong mid-range talk (peaking between 2,000 and also 4,000 RPM) will certainly have great passing acceleration, while most low-end torque (below 1,500 RPM) is advantageous for towing trailers or driving off-road. However, cars with high-torque engines are an ext likely to slip and also slide in rain and also snow.

All the said, various other factors, such as how much the vehicle weighs, will impact acceleration. How the vehicle feels once you drive it is much more important 보다 the horsepower and torque ratings.

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