How does the number of values relate to the number of cylinders in a motorbike engine?
Answers:
just like in cars, some have 2,3,4 valves, it does not relate to the number of cyl., just the type of motor, rpm range,usage,ect. 2 valves
per cyl. are used mostly for lower rpm motors, 4 valves are used for
high rpm motors, 3 valves are a compromise.
It doesn't!
Bikes can have from two to five valves per cylinder.
I assume you mean 'valves'
A cylinder will have a number of valves to allow the inlet gases in and the exhaust gases out.
At a basic level this would be one valve for each - in total 2 valves per cylinder. So a V-twin would have 4 valves.
However better gas flowing is achieved with multiple valves as there is a greater total valve perimeter for the gas to flow over.
Most motorcycles have four valves per cylinder - 2 inlet and 2 exhaust - so a 4 cylinder bike would have 16 valves in total. Some Yamahas have 5 valves per cylinder - 3 inlet and 2 exhaust (I think!) - this would give a total of 20 valves in a four cylinder motor.
Bike engines have between 1 and 6 cylinders, (one racing bike in the 50s had 8!), the most common are 1,2 and 4 cylinders. At their simplest they have just two valves for each cylinder.
To make an engine produce its maximum power for the swept volume you need to make it rev very high, and large valves have too much mass to cope with high revs so multivalve engines were developed, possibly 5 tiny valves per cylinder which would allow the engine to rev to 16000+. This type of engine would produce a lot of power at high revs but be difficult to ride as it would produce comparatively little low down power
Hey graham the yamaha genesis engine is 5 valves.I dont science but I know engines.
it does not they every thing from 2 to 5 valves per cylinder
no correlation between valves and cylinders. Two completely different functions in an internal combustion engine (ICE)
As stated above, physics determines the number of valves depending on the parameters of the engine design. If a motor is designed to run at low rpm and low power levels so as not to stress the components, a single intake and exhaust valve is used. A high revving tight tolerance, performance engine requires that compromise must be made as the materials currently available for mass manufacturing won't operate efficiently due to mass, inertia and the resultant forces.
It is also important to note that a 2 stroke engine has ZERO valves, as a reed cage meters the intake gasses, and the location of the ports determines exhaust direction
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