Here I came across a idea of creating a vehicle (say bike) with engine which have different cc (power) in different scenario.
Suppose I have a 250cc bike which never gives me mileage more than 35kmpl but comfort while driving on highway with high speed. On other way my second bike with 100cc is better suited for city traffic which gives me 70kmpl on average speed at 40-50Kmph.
But a 250cc bike always gives me 35kmpl no matter I am driving through city or highway. I don't want very much power while driving in city traffic.
What I am thinking is to create a engine which can be adjusted according to situation. If I am driving on highway I can switch it to 250cc power engine and, can drive with high speed while driving in city, adjust its power to 100cc and get maximum mileage.
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this is not gear to shift so rapidly since now a days all the pistons are sttached to the crank at all times if you have reduce the cc then you will have to go for a remodelling of the entire engine at all time
Surely its not a like gear shift... but if it is possible we can save lots of fuel.
I am curious how it could be possible.
One thought is to reduce side by side walls of combustion chamber to reduce volume.
why dont you try it in a smaller scale first a method of disconnecting the piston rods and the fuel injectors of some of the cylinders that will reduce cc and also increase mileage
This is such an interesting thread that has intrigued me..! 😀 Kudos #-Link-Snipped-#..! Let us all together design a way..! Shall we?? There are many excellent mechanical brains here..! 😀 This is a real life problem which needs a remedy for sure..!! 😀 let us work together..! 😀
Variable compression ratio engine,you want a VCR engine. VCR engine with supercharging will perform just like you were talking about.
Prototypes of these type of engines are developed but no production model yet.
Cylinder shutoff method is also used for v6 and v8 engines to improve fuel mileage under light load conditions.
Variable compression ratio engine,you want a VCR engine. VCR engine with supercharging will perform just like you were talking about.
Prototypes of these type of engines are developed but no production model yet.
Cylinder shutoff method is also used for v6 and v8 engines to improve fuel mileage under light load conditions.
vcr"s have a much lower mileage as the fuel injected are not at all hampered by the compression ratio of the bike
In an engine of 'n' cylinders we have to think about a mechanism in which oly 'n-k' cylinders are operated for 'X' cc and 'n-g' cylinders are operated for 'Y' cc and so on and so forth..!! Any ideas to achieve this feat?? all mathematical and logical explanations are welcomed..! 😀
And the arrangement must be made to operate manually by switching..! 😀 This is my idea..! Correct me anywhere if I am wrong..! 😀 (Not completely my Idea..! Idea gained after some references..! )
Interesting concept! So this vehicle needs to be powered by only one source (in your case ICE) and you are not looking to achieve the results via gearing or ECU? Looking forward to reading everyone's ideas! The industry has already had hit and miss as well as cylinder deactivation so let's see what great ways we come up with!
I dont think we need a restrainer because we are reducing the amount of cylinders when we are reducing the cc...! Why do you say we need a restrainer?
the point is no of cylinders cant be decreased just like that so if we ARE REDUCING CC ALSO the other cylinders which you are not using will be charged thereby a loss in fuel we may also have to tackle with one prob in any case the speed at which this transition is safe
In an engine of 'n' cylinders we have to think about a mechanism in which oly 'n-k' cylinders are operated for 'X' cc and 'n-g' cylinders are operated for 'Y' cc and so on and so forth..!! Any ideas to achieve this feat?? all mathematical and logical explanations are welcomed..! 😀
And the arrangement must be made to operate manually by switching..! 😀 This is my idea..! Correct me anywhere if I am wrong..! 😀 (Not completely my Idea..! Idea gained after some references..! )
Different capacity cylinders means difference in size of pistons and cylinder bore.I think it will create huge unbalanced forces.And what about the size of flywheel,different capacities need different flywheel mass.
I don't know much about inside of engine technology but what I understand from this video
There are 4 separate combustion chamber.
Now what we can do is when we need less power we will detach end cylinders to get a balanced engine with just of half power.
Surely it is not like gear changing but we can change cc at engine start up.
Is it possible?
I don't know much about inside of engine technology but what I understand from this video
There are 4 separate combustion chamber.
Now what we can do is when we need less power we will detach end cylinders to get a balanced engine with just of half power.
Surely it is not like gear changing but we can change cc at engine start up.
Is it possible?
Exactly #-Link-Snipped-# yes we can use only two cylinders to produce half the power just at the start up but how?
Exactly #-Link-Snipped-# yes we can use only two cylinders to produce half the power just at the start up but how?
this can be done by cutting off the power to the spark plugs at the end cylinders.(in case of petrol engine).
This principle is just similar to that of the morse test performed on I.C engines.
now in order to keep the crankshaft in rotation, we can clutch it to a slightly heavier flywheel , whenever this "half-power-mode" is being switched on to.
this can be done by cutting off the power to the spark plugs at the end cylinders.(in case of petrol engine).
This principle is just similar to that of the morse test performed on I.C engines.
now in order to keep the crankshaft in rotation, we can clutch it to a slightly heavier flywheel , whenever this "half-power-mode" is being switched on to.
The problem is only the ignition is stopped whereas the fuel injection must also be prevented into the unused cylinder
I dont think we need a restrainer because we are reducing the amount of cylinders when we are reducing the cc...! Why do you say we need a restrainer?
Lol me. This statement was misinterpreted(by me).! i.e. I thought He said that a restrainer is needed for all the working cylinders. My bad. 😀 Yes restrainers are needed for cylinder that are cut off. 😀
guys injection okay
cylinders okay
what about fly wheel and crank they also have to be modified
As for the flywheel, two parallel flywheels, one heavy and one light, can be fixed on the end of the crankshaft.
the crankshaft end has to be modified in such a manner, so as to accommodate splines and the two flywheels with female splines in their hubs, can slide over it.
when the full power mode has to be used, then the lighter flywheel can be slid into action, and when the half-power mode is switched on, then the heavy flywheel can be clutched to.
this clutching-declutching action can be carried out by a solenoid.
#-Link-Snipped-# , #-Link-Snipped-# ,Will such an engine design create unbalanced forces?
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Imagine there are 4 cylinders two of them with larger bore diameter.Now in the full power mode does all the 4 cylinders needed to be working or is it just the 2 with larger displacement.? If all 4 cylinders are working then,what about the firing order at full power mode?
This just an idea that popped up.Sorry this is just a rough image, drew it using MS paint.
Basically the idea is to use separate crankshafts for different size cylinders.Now they can be coupled together through a one way clutch.Concept is like two engines are mated together.
Benefits are when larger cylinders are shutoff they are at complete stand still so that no power is lost because of friction.
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Still one problem is that , how to synchronize the rpm of both engines?Maybe we should use a CVT instead of one way clutch.
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Sorry that the text is not in any order, am just typing on as these questions come to my mind.
For discussion purpose it is okay, this concept let's you think out of the box.But I wouldn't take it seriously, the reason is there won't be a drastic increase in the fuel economy.
For discussion purpose it is okay, this concept let's you think out of the box.But I wouldn't take it seriously, the reason is there won't be a drastic increase in the fuel economy.
You have a point there. but this project is worth working on, just for the sake of it.
I haven't read all the posts. I apologize if I post the same idea. 😐
Don't you think building a less fuel consuming engine is easier than building an engine that is capable of adjusting its volume when it is needed?
I have heard about the electrical vehicle racing. These cars and motorcycles run fast just like any other racing vehicle. However, these engines must be expensive. I believe that dedicated engineers who work on this technology will eventually find a way to invent a clean, powerful engine. All the user need to do when driving or riding in the urban streets is to set the limiter for their engines.
