Does A 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. That means it has lesser space for valves.

Does stroke length increase torque?

Having a longer stroke increases torque as the power from the combustion of fuel is allowed to act on the piston over a greater time and distance. A longer stroke usually means a lower RPM range as crankshaft diameter, con rod angles etc come into play.

How does stroke affect torque?

In this engine, the stroke-length is longer than the cylinder bore. Generally, ‘Under-Square’ design tends to produce comparatively higher torque. Hence, engineers also refer to it as ‘high-torque’ engine. As the stroke-length is long, the piston has to travel a longer distance which tends to increase engine’s torque.

Which is better short stroke or long stroke?

For any given cubic capacity, an over square engine has to move lesser as it has a wider bore. These engines also have lesser inertial stress which allows them to be equipped with faster valve timing. This lends a short stroke engine, in general, the ability to rev higher than its long stroke counterparts.

Is longer stroke better?

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?

Horsepower equals torque multiplied by rpm, divided by a constant. 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 does stroke affect engine performance?

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.

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.

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. Engine displacement is calculated by multiplying the cross-section area of the cylinder (determined by the bore) by the stroke length.

What is the benefit of long stroke engine?

Increased thermal efficiency: Simple geometric relationships show that an engine cylinder with longer stroke-to-bore ratio will have a smaller surface area exposed to the combustion chamber gasses compared to a cylinder with shorter stroke-to-bore ratio.

What is the best stroke ratio?

We hear a lot of engine builders shoot for a ratio between 1.5:1 and 1.8:1 on a street motor, with 1.75:1 considered ideal, regardless of application. The most highly developed four-stroke engines in the world – Formula 1 and motorcycle engines – have rod ratios of more than 2:1.

What is superlong stroke?

Super long stroke means increased swept volume allowing more mass of air to be drawn into the cylinder which in turn allows more fuel to be burnt, hence increasing power output. Super long stroke increases piston travel time and thereby decreases crank speed so more time for combustion during the stroke.

Does boring a motor increase power?

Boring an engine involves using machines to widen and taper the cylinders. From a performance standpoint, boring an engine could give you more horsepower and torque, as it will change the engine’s displacement.

What is the difference between horsepower and torque?

They measure different things
Simply put, torque is a way to measure force. Specifically, it’s a measurement of the rotational force within your car’s engine at the crankshaft. Horsepower, on the other hand, measures the amount of power that’s transferred from the engine to the wheels.

Do oversized pistons increase horsepower?

The percentage increase in displacement from a bigger bore piston will deliver an equal percentage increase in torque and horsepower.

Is 400 ft lbs of torque a lot?

It is horsepower that moves your car or your motorcycle. Having 400 pounds of torque down low means you have more horsepower down low. Having 400 pounds of torque up high means you have even more horsepower then you had down low.

Does more torque mean faster acceleration?

In terms of acceleration, torque plays a bigger role in how quickly your car accelerates. That’s because the torque is a result of the force the pistons generate and at what speed. The quickest vehicles can generate high levels of this torque force at relatively low rpm. This allows the vehicle to accelerate quickly.

Is 300 torque a lot?

You will want more torque for hauling heavy loads, for heavy vehicles, or slow speed, low gear responsiveness. Overall, 300 horsepower is a lot. In the 80s it was very uncommon for production vehicles to make so much power. In modern times, even very normal cars make up to, and sometimes more than, 300 horsepower!

What makes an engine more powerful?

Engines make power by moving air through them. A smaller engine can move more air than a larger one by having better flowing heads, turbochargers or revving much higher or any combination thereof. The more air you can move through an engine matched with proper fuel, the more power you’ll make.

When should you bore an engine?

Damaged piston in any way may be reason enough to re-bore your cylinder. Vertical scratches that you can feel on the cylinder wall is reason enough to bore your cylinder. Any piston seizing is a reason to bore your cylinder. Any apparent piston damage or vertical lines are an indication that a cylinder should be bored.

What are the disadvantages of an over square engine?

Cons: Increases the stresses on the rotating assembly. Mean piston speed is higher, rate of acceleration/deceleration near TDC and BDC is higher, side thrust forces perpendicular to the cylin… An over square engine will have the opportunity for greater valve area ergo increased volumetric efficiency.