What is a displacement (motorcycle)?
Hey, my loves 🙂
I've been into motorcycles for a while now, and I'm looking at how much a 125cc bike costs. It says 125cc displacement. What does that mean?
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The Lifting capacity (including Capacity ) denotes for the cylinders of reciprocating piston engines the enclosed volume, which is formed from the working path of the individual piston stroke (" Hub ") and the effective piston cross-sectional area (" borehole ").
Calculation
As a rule, the effective piston cross-sectional area is the circular surface A enclosed by the piston seal or the inner cylinder wall, where r is the semi-knife of the piston surface).
On the other hand, a larger piston surface is not to be set, which results from a curved piston end surface instead of a planar piston end surface.
The piston stroke is the path traveled between the two outermost positions of the piston, in engines, denotes the upper and lower dead center.
The stroke volume V thus results with Aw as an effective piston surface and h as a stroke path to V=Aw×h.
Short strokes are often built with a larger piston surface and allow the accommodation of larger valves.
They are more speed-resistant and thus enable high liter performance. They are therefore mainly used in sports cars and most motorcycles.
Long strokes allow for better combustion space design and more optimized combustion.
They have a slightly higher efficiency. You can find yourself in cars rather than in motorcycles.
http://motorrad.wikia.com/wiki/Hubraum
As the name suggests, the displacement space is the space that all pistons take during a lifting process, ie from top to bottom dead center.
It is calculated by: displacement = piston cross-sectional area* piston stroke*number of pistons
This is 125 cm3 in your case.
The combustion chamber does not count, that is the space above the piston during the ignition process
This means that a 2-stroke at each revolution and full gas sucks about 125 cc gasoline air mixture. A four-stroke unit sucks this amount every 2 turns. The amount of gasoline-air mixture sucked in has a direct influence on performance.
The air is sucked in through the downward piston and the volume which it passes along the entire path from top to bottom is the displacement space and which corresponds approximately to the quantity of mixture sucked in.
Hello.
The space in which the piston moves up and down.
The engine has 4 lifts + pistons x 4, ccm
This is the volume of the space by moving the piston up and down while the engine is running
the displacement space is the volume of the cylinders of a motor.
Not quite.
but is measured in this way, the displacement space is measured from the UT of the piston to the cylinder head
No, from the upper to the lower dead center, so it also means a displacement space because it is the space that the pistons take in a piston stroke.
No, the hub, so OT to UT. The compaction room does not count.
yes I wrote wrong
Unfortunately, because the cylinders are considerably longer than the hub … otherwise the pistons at the lower dead center would have left the cylinder to the full …
piston diameter x Pi / 4 x stroke
Extremely coarsely simplified engine capacity.
125 cubic, this is 0.125 liters. This means that the combustion chamber in the cylinders is about as large as a small cafe cup.
The combustion chamber and the engine are NOT the same!
https://de.wikipedia.org/wiki/Hubraum