We and our third party partners use technology such as cookies on our site. This is to give you a better experience, analyse how you and other visitors use this website and show you relevant, tailored advertisements. By using this website you agree to the use of cookies. You can read our Cookies Policy using the link in the footer of this page.




Accept cookies
Mechanic

How a 4 stroke engine works



The Otto cycle is characterized by four strokes, or straight movements alternately, back and forth, of a piston inside a cylinder:

1. intake (induction) stroke

2.
compression stroke

3.
power (combustion) stroke

4.
exhaust stroke

The cycle begins at top dead centre (TDC), when the piston is furthest away from the crankshaft. On the first stroke (intake) of the piston, a mixture of fuel and air is drawn into the cylinder through the intake (inlet) port. The intake (inlet) valve (or valves) then close(s) and the following stroke (compression) compresses the fuel-air mixture.

Four-stroke cycle (or Otto cycle)The air-fuel mixture is then ignited, usually by a spark plug for a gasoline or Otto cycle engine or by the heat and pressure of compression for a Diesel cycle or compression ignition engine, at approximately the top of the compression stroke. The resulting expansion of burning gases then forces the piston downward for the third stroke (power) and the fourth and final stroke (exhaust) evacuates the spent exhaust gases from the cylinder past the then-open exhaust valve or valves, through the exhaust port.

Engine Tuning centres in UK

Check Engine Oil

VIN NUMBERS

Before you buy

Your Moans & Groans






CTC
Cookie Policy | Privacy | Terms & Conditions | Contact Us Copyright © 2000 - 2018 Checkthatcar.com. All rights reserved