4 Stroke Engine Working Animation

A basic lesson in the fundamentals of a  four-stroke efi gas engine may be  helpful to your understanding of mercury  products here are the basic components  of every four stroke gas engine a piston  a connecting rod a crankshaft as the  piston travels up and down in the cylinder.

This lateral motion is turned  into a rotating motion at the crankshaft  the longer the stroke of the piston the larger the displacement of gas and air  occurs in the cylinder to propel that  piston we need to ignite a tiny bit of  gas and a whole lot of air this creates  expansion inside the cylinder the fuel  delivery system consists of an air  intake manifold valves intake and  exhaust a fuel injector and a spark plug .

A four-stroke engine is called a  four-stroke because for up and down  motions are needed to complete the cycle  in the first stroke the piston travels  downward as the intake valve opens in a  mixture of air from the atmosphere and a  metered amount of gas from the  electronic fuel injector enter the  cylinder this is called the intake  stroke on the second stroke the piston  travels upward compressing the air and  fuel to make a highly combustible  mixture.

This is called the compression stroke at this point the spark plug  fires sending the piston downward from  the expansion of the air and gas mixture  this is the combustion stroke  the fourth stroke is the exhaust stroke  as the piston travels upward the exhaust  valve opens to release the burned air  fuel mixture when the piston reaches the  top of this stroke the intake valve  opens and the cycle begins all over again.

It takes one up-and-down motion or two  strokes of the piston to create one  revolution of the crankshaft rpms or  revolutions per minute is how many times  the crankshaft rotates within that  minute at wide open throttle the  crankshaft may turn at 5000 rpms or a  dizzyingly eighty-three times per second  meanwhile the piston traveled up and  down 166 times in that same second want  to see how fast that is  now that's fast let's see it again  amazingly the four-stroke EFI engine  does this smoothly quietly and reliably  for years and years of operation.