‘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 engines have a higher volume to surface area ratio.
Does longer stroke mean more torque?
Instead, long-stroke engines produce higher torque at lower RPMs. For example, the Sportster produces 73.2 Nm of maximum torque at 3,750 RPM, while the Street Triple produces 78.6 Nm at 9,350 RPM. A longer-stroke cylinder usually has a narrower combustion chamber.
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.
What is the advantage of a longer stroke engine?
Now, while the power produced by a typical long stroke engine is relatively less, it has its own advantages. These engines produce a much healthier torque at the lower range of the rev spectrum lending themselves to torquey, lazy revving machines very well.
Why does 4 stroke have more torque than a 2 stroke?
This is due to the fact that fuel is consumed once every 4 strokes. Four-stroke engines are heavier; they weigh upwards of 50% more than a comparable 2stroke engine. Typically, a 2-stroke engine creates more torque at a higher RPM, while a 4-stroke engine creates a higher torque at a lower RPM.
Does stroking an engine increase torque?
A stroker is an engine that has been modified to increase the length of the stroke and therefore has a greater engine capacity. Its benefits are improved torque and power.
What makes more torque bore or stroke?
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.
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.
What is are the advantage of super long stroke engine as used in main propulsion of a ship?
Low quality fuel can be burnt as more time is available for fuel combustion. Slow rpm is possible so large diameter propeller can be used and hence propeller efficiency increases. More time for heat dissipation to cooling water.
What is the advantage of increased stroke bore ratio?
Larger bore-to-stroke ratios allow increased valve sizes and improved breathing, especially at higher engine speeds. Larger bore-to-stroke ratios result in lower piston speeds at any given engine speed, thus allowing higher engine speeds.
Is a longer stroke engine better?
For a given engine speed, a longer stroke increases engine friction and as a result, increases the stress on the crankshaft. ‘It’s because of the higher peak piston acceleration. A long bore engine, as the name suggests, has a longer cylinder.
Why do diesel engines have longer stroke?
Diesel engines are designed with longer strokes in mind, as this produces more torque and more power. The more pressure built in the strokes and cylinders, the more torque the wheels will have. The combustion temperature of diesel fuel is also designed for higher torque.
Why do engines have clearance volume?
Two components of cylinder volume are important: … This volume determines the capacity of the engine. (b) The “Clearance volume” of the engine is the volume between the cylinder head and the piston when the piston is at tdc. The ratio of this volume to the swept volume determines the compression ratio of the engine.
Which is more efficiency 2-stroke or 4-stroke?
Compared to four stroke engines, two strokes are lighter, more efficient, have the ability to use lower-grade fuel, and more cost-efficient. Therefore, the lighter engines results in a higher power-to-weight ratio (more power for less weight).
Do 2 strokes have more power than 4 strokes?
Because combustion takes place with each revolution of the crankshaft with a 2-stroke, this format puts out more power than a 4-stroke engine and the power has more instantaneous delivery. This are some reasons why 2-stroke engines have a long history of use on many different types of motorcycles.
Why are 4-stroke engines more environmentally friendly than 2-stroke engines?
The four-stroke engine is cleaner because it burns pure petrol; the two-stroke engine, on the other hand, burns a combination of lubricating oil and petrol and a fair amount of the oil is emitted as unburnt vapour. Source: Ministry of environment and forests.