Engine And Transmission

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Engines and transmissions are mechanical systems typically found in bigger machines. Each has its own uses and functions which this article aims to enumerate and explain.

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Summary Table

A machine that uses different forms of energy to produce mechanical energyControls the application of power in mechanical engines
Categorized by the energy used and output producedCategorized into how gear switching is achieved manual and automatic


An engine, also referred to as a motor, is a machine that is designed to transform one form of energy into mechanical energy. A heat engine burns fuel to be able to produce heat, which in turn, turned into force. Motors powered by electricity use electrical energy to produce mechanical motion. Myosins (i.e. molecular motors) found in muscles produce force to enable motion through the help of chemical energy.

An engine can be categorized using two criteria: the form of energy it can use to produce motion and the kind of motion it produces. These are heat engines, electric motors, physically powered motors, and hydraulic motors.

Heat engines use heat energy and chemical energy to produce mechanical energy. Common examples of heat engines are found in cars, rockets, nuclear submarines, and wristwatches. Electric motors (e.g. dynamo, generators) harness electrical energy to produce mechanical energy. These are household appliances, machine tools, and industrial fans to name a few. Physically powered engines run on potential or kinetic energy which includes pneumatic motors, elastic bands, and clockwork motors. A hydraulic motor is another kind of engine that gets its power from pressurized fluid. Hydraulic motors are usually used to produce motion and move heavy loads.

A transmission, usually referred to as a gearbox, is a mechanism found in a power transmission system. In mechanics, a transmission is a machine that controls the application of the power produced by mechanical engines. It utilizes various gears and gear trains to distribute torque and speed conversions coming from a rotating power source to another device.

The most common application of transmission systems is in motor vehicles. This is where the transmission adapts the power produced by the internal combustion engine to the drive wheels. The transmission works to reduce higher engine speeds to match the slower wheel speeds. This action results in an increased torque. Pedal bicycles also make use of simpler transmission systems where varying rotational speeds and torques are adapted.

A typical transmission system is composed of a number of gears (i.e. gear ratios) with the ability to switch between these gears as speed increases or decreases. Switching gears may be done either manually or automatically. Forward and reverse control may also be incorporated, particularly in most motorized vehicles.

In automobiles, the transmission is usually connected to the engine crankshaft through a flywheel or fluid or clutch coupling. Output from the transmission transfers through the driveshaft to the differentials which, in turn, drive the wheels. In addition to gear reduction, a differential’s main function is to allow the wheels at both ends of an axle to spin at varying speeds while it changes the direction of the rotation.

Used Engines And Transmissions

Engine vs Transmission

So what’s the difference between an engine and a transmission? In mechanics, an engine is a machine specifically designed to transform one kind of energy into mechanical energy. In motor vehicles, a transmission system is a machine that controls the distribution of power generated by its internal combustion engine.

An engine is categorized by the energy it uses and the kind of motion it produces. Heat engines, electric motors, physically powered motors, and hydraulic motors are the different categories in current use. A transmission system is categorized by the process in which gear switching is achieved, either be manual or automatic.



Here’s a quick video about the difference between an engine and a transmission.

© Chris Doane Automotive - Car and Driver Engine and Transmission

Engine and Transmission Rating: © Car and Driver Warranty and Maintenance Coverage

© Car and Driver Engine and Transmission

Implanted with a rhapsodic twin-turbo 2.9-liter V-6 and an exquisitely calibrated eight-speed automatic transmission, the rear-drive-only Giulia Quadrifoglio is a riot to pilot. The Italy-built, Ferrari-derived engine produces a spine-tingling timbre that shames most rivals. Too bad a manual transmission isn’t available on the U.S. version, and several mechanical glitches we experienced have reminded us of Alfa’s infamous reliability issues.

What’s New for 2018?

Research the Alfa Romeo Giulia on MSN AutosFind an Alfa Romeo Quadrifoglio near you

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Since 2018 is only its second year of production, we correctly assumed that Alfa wouldn’t alter the Giulia Quadrifoglio’s engine and transmission. While we hoped that a manual version would make it to our shores, that dream did not come true.

© Provided by Hearst Communications, Inc We test the performance of the Giulia Quadrifoglio on the track and in the real world. See how the Giulia Quadrifoglio’s powertrain compares with its competition.

2017 Alfa Romeo Giulia Quadrifoglio

The QF’s boosted mill generates 505 horsepower and 443 lb-ft of torque, which makes more stallions than the BMW M3 or Cadillac ATS-V. The Mercedes-AMG C63 S almost matches the QF with 503 horses, but its glorious twin-turbo V-8 has a greater torque reserve (516 lb-ft). Our comparison test confirmed that this duo of four-door tour de forces have almost indistinguishable performance. Since that comparison, we tested another Quadrifoglio that hit 60 mph in 3.7 seconds and bridged 50 to 70 mph in 2.9 ticks (both adding 0.1 second, respectively). In both tests, it finished the quarter-mile in less than 12 seconds-impressive for any car. The Alfa and AMG are virtually equals, with dead-even acceleration times and base prices separated by $130. Although the diminutive Audi RS3 is in another class, its pared-down price and eye-popping performance warrant comparisons.

The Giulia’s engine contains its excitement when cruising at low rpm and in top gear. A hint of hesitation precedes throttle prompts below 3000 rpm, but then the twin turbos spool up and power builds in a whirlwind of acceleration and thunderous exhaust sounds. It’s a spectacular sensation that is simultaneously chaotic and exotic. The QF gets an upgraded version of the Giulia’s DNAdrive-mode selector, which offers Dynamic, Natural, and Advanced Efficiency settings. The DNA Pro system in the Quadrifoglio gains an exclusive Race setting, which activates the dual-mode exhaust and deactivates the security of electronic stability control. While we mourn the missing manual gearbox, the eight-speed automatic is fantastic. Large steering-column-mounted paddles are perfectly placed and sweet to squeeze. The autobox is decisive and imitates the quickness of dual-clutch alternatives in its sportier drive modes.

Used Coyote Engines And Transmissions

Test Results: Acceleration

© Car and Driver Engine and Transmission

Continue Reading:

Engine And Transmission Mounts

• 2018 Alfa Romeo Giulia Quadrifoglio: overview
• Engine and Transmission
• Fuel Economy and Driving Range
• Performance and Driving Impressions
• Exterior Design and Dimensions
• Warranty and Maintenance Coverage