What is short stroke and long stroke engine?
If one makes a cylinder with exactly same bore and stroke measurement, the resulting engine is called a ‘square’ cylinder. That’s the reason why a short stroke engine is also called an over-square engine while a long stroke engine is termed as an under-square engine.
What does a longer stroke do?
At a given engine speed, a longer stroke increases engine friction and increases stress on the crankshaft due to the higher peak piston acceleration. The smaller bore also reduces the area available for valves in the cylinder head, requiring them to be smaller or fewer in number.
Which is better short-stroke or Longstroke?
‘It’s because of the higher peak piston acceleration. A long bore engine, as the name suggests, has a longer cylinder. These engines reach their peak torque at a lower rpm when compared to a short-stroke engine. These are more efficient engines and are moreover used in commercially selling cars.
Which is better stroke or bore?
The short answer is that a bigger bore is generally the best way to get more power. A bigger bore with a shorter stroke also allows an engine to rev higher, which creates more horsepower. Conversely, a long stroke is generally better for fuel efficiency, because it reduces surface area during combustion.
Does rod length affect stroke?
Longer rods can improve rod stroke ratio, reducing thrust loading on the piston. A popular misconception is that rod length affects displacement, which it does not. Only cylinder bore and crankshaft stroke alter the displacement of an engine. Longer rods typically require shorter, lighter pistons.
Do oversized pistons increase horsepower?
The short answer is that a bigger bore is generally the best way to get more power. It creates more space, allowing for bigger valve openings, which in turn can bring more fuel and air into the cylinder. A bigger bore with a shorter stroke also allows an engine to rev higher, which creates more horsepower.
Why do smaller engines rev higher?
Smaller engines have to rev up more to achieve the same power as larger engines. Every cylinder has it’s own reciprocating weight in the piston and connecting rod. The length of the stroke affects how high it will rev.
What does stroke length mean?
The stroke length is how far the piston travels in the cylinder, which is determined by the cranks on the crankshaft. This number is multiplied by the number of cylinders in the engine, to determine the total displacement.