Camless Engine: It would save fuel, run cleaner and more,,,
Good evening mates,
Most four-stroke piston engines today employ one or more camshafts to operate poppet valves. The lobes on the camshafts operate cam followers which in turn open the poppet valves. A camless (or, free valve engine) uses electromagnetic, hydraulic, or pneumatic actuators to open the poppet valves instead. Actuators can be used to both open and close the valves, or an actuator opens the valve while a spring closes it.
As a camshaft normally has only one lobe per valve, the valve duration and lift is fixed. The camshaft runs at half the engine speed. Although many modern engines use camshaft phasing, adjusting the lift and valve duration in a working engine is more difficult. Some manufacturers use systems with more than one cam lobe, but this is still a compromise as only a few profiles can be in operation at once. This is not the case with the camless engine, where lift and valve timing can be adjusted freely from valve to valve and from cycle to cycle. It also allows multiple lift events per cycle and, indeed, no events per cycle—switching off the cylinder entirely.
Camless engines are not without their problems though. Common problems include high power consumption, accuracy at high speed, temperature sensitivity, weight and packaging issues, high noise, high cost, and unsafe operation in case of electrical problems.
Source: Camless
In camless engines the method will simply be solenoids and sensors and some magnetic actuators (I don't have sufficient details).
However, there is a rumour saying that BMW will be the first to release it on its 3-series cars 😉
cheers,
Most four-stroke piston engines today employ one or more camshafts to operate poppet valves. The lobes on the camshafts operate cam followers which in turn open the poppet valves. A camless (or, free valve engine) uses electromagnetic, hydraulic, or pneumatic actuators to open the poppet valves instead. Actuators can be used to both open and close the valves, or an actuator opens the valve while a spring closes it.
As a camshaft normally has only one lobe per valve, the valve duration and lift is fixed. The camshaft runs at half the engine speed. Although many modern engines use camshaft phasing, adjusting the lift and valve duration in a working engine is more difficult. Some manufacturers use systems with more than one cam lobe, but this is still a compromise as only a few profiles can be in operation at once. This is not the case with the camless engine, where lift and valve timing can be adjusted freely from valve to valve and from cycle to cycle. It also allows multiple lift events per cycle and, indeed, no events per cycle—switching off the cylinder entirely.
Camless engines are not without their problems though. Common problems include high power consumption, accuracy at high speed, temperature sensitivity, weight and packaging issues, high noise, high cost, and unsafe operation in case of electrical problems.
Source: Camless
In camless engines the method will simply be solenoids and sensors and some magnetic actuators (I don't have sufficient details).
However, there is a rumour saying that BMW will be the first to release it on its 3-series cars 😉
cheers,
Replies
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kasi kumarIt's possible ah? -
PraveenKumar PurushothamanWow, but in the current scenario, is this feasible? Atleast in the Indian traffic???
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Al-OtaibyIts absolutely possible, for example there is a temperature sensor controlling the flow of the fuel, in case the motor is cold it will flow more fuel and once it reaches the ideal running temperature it will reduce the petrol flowing.
A similar concept will apply to the camless engine, perhaps sensors to verify to piston location and it will send the data to the computer which will give the order to solenoids to open and close accordingly. -
Al-Otaiby@praveenscience
They are claiming that it will save fuel and it will respond faster the driver's right foot.
So I believe it will be feasible in the Indian traffic 😉 -
PraveenKumar PurushothamanWow, awesome... So, you said that BMW may be implementing it... Any other companies trying it for the Indian market?
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Al-OtaibyBMW will be the first but till now they are testing the engine,,,
However, other companies such as Renault, Fiat, Valeo, General Motors, Ricardo might be doing it =^.^= -
PraveenKumar PurushothamanCan a similar concept be made for Two Wheelers??? Coz, its already price hike for petrol!!! 😲
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Al-OtaibyI don't believe this would work for 2 wheelers!
Because most of the 2 wheelers and fixed engines (such as generators) runs on a 2 stroke engine!
![[IMG]](proxy.php?image=http%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F5%2F52%2FArbeitsweise_Zweitakt.gif%2F550px-Arbeitsweise_Zweitakt.gif&hash=d4614e32860de724c693b3cd519b3c5a)
in the 2 stroke engine there is an inlet port (hole) for the mixture and there is an exhaust port.
we should also bear in mind that 2 stroke engines uses oil in its mixture!
its a pity that they don't have valves!!! -
PraveenKumar PurushothamanHey, what about bikes with 4 stroke engines??? Like mine, Honda CB Twister!!! 😀
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PraveenKumar PurushothamanBy the way, Honda CB Twister features 4-stroke Air-cooled SI engine and 9bhp power.
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Al-OtaibySeriously buddy I've no idea,,,
I never heard that Honda is going to do anything similar, nor any company is trying to do it on bikes,,,
however, theoretically it would work on your bike 😉 -
Al-Otaibyits absolutely great, but I'm worried about it,,,
because in the current situation 90% of the motor now days is computers, sensors, CPUs ,,, etc
In the new Audi you need to computer to change the breaks!!! -
PraveenKumar Purushothaman
Hey, they aren't in India right?Al-Otaibyits absolutely great, but I'm worried about it,,,
because in the current situation 90% of the motor now days is computers, sensors, CPUs ,,, etc
In the new Audi you need to computer to change the breaks!!! -
Al-OtaibyIts here in Jordan 😀
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