A longer-stroke cylinder usually has a narrower combustion chamber. That means it has lesser space for valves. … However, less air-fuel mixture means quicker combustions at low RPMs, resulting in higher torque at low RPMs. Also, piston speeds are higher.
Do short stroke engines have more torque than long stroke engines?
An oversquare engine means larger valves in the head of the cylinder. A short–stroke engine has a higher possible rpm, but surprisingly the torque remains the same.
How does stroke length affect torque?
In this engine, the stroke-length is longer than the cylinder bore. Generally, ‘Under-Square’ design tends to produce comparatively higher torque. … As the stroke-length is long, the piston has to travel a longer distance which tends to increase engine’s torque.
Why do 2 strokes make more torque?
The 2-stroke has a narrower powerband and makes less torque for its power output, resulting in needing more rpm to make its power, it’s hard to justify it in a regular automobile. You would need a way to keep rpms considerably higher than a comparable 4-stroke.
Do oversize pistons give more power?
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.
What is better more torque or more horsepower?
Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.
How do you shorten a stroke?
To shorten the stroke of an existing engine, at a minimum you will need: 1) a new crank with a shorter throw. 2) new longer rods; or new pistons with a taller deck; or a block with a lower deck height; or some combination of these three.
Is 3 stroke engine possible?
A three-stroke internal combustion engine completes a complete combustion cycle of exhaust, intake, compression, ignition, and expansion within a single revolution of a crankshaft by a single stroke of a first piston and a single stroke of a second piston within a single cylinder.
How do you increase piston stroke?
You can increase the stroke on any crank by offset-grinding the rod journal, which moves the journal centerline away from the crank centerline. This also reduces the overall diameter of the rod journals, often requiring custom connecting rods to match.