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SI is SPARK IGNITION - Otto (4-stroke) and Day (2-stroke) cycle
CI is COMPRESSION IGNITION (DIESEL) also in 4- and 2-stroke variants
The SI spark plug is timed to start combustion at the ideal moment, usually some degrees before the piston reaches the top (TDC or Top Dead Centre). The burning mixture then drives the piston down for the power stroke.
The CI fuel is injected (sprayed) into the cylinder at the ideal moment - this too is usually some degrees before TDC, and the red-hot air in there then starts the fuel burning. This then drives the piston down for the power stroke.
SI is limited in maximum compression ratio (the amount the air or mixture is compressed as the piston rises in the cylinder), or it can start to behave like CI (Dieselling).
CI uses the highest compression ratio possible to improve ignition - and - improve efficiency too... The expansion ratio is the inverse of the compression ratio, and the more that the burning gas is allowed to expand whilst doing work, the better the efficiency.
CI is also an 'excess air' cycle, potentially. A full cylinder of air is compressed each time, and the amount of fuel injected is varied to change power - this is beyond the lean burn that can be achieved with SI.
What else can I help you with?
Why does other air crafts uses 4 engines to fly while others use 2 engines?
It's a question of trade offs and compromises. Two engines are easier to deal with than four engines, you'll only have two throttles, two fuel systems, two oil pressure gauges etc etc. OTOH, to get the same power out of two engines as you would have out of four, each engine has to be doubly powerful, and that's a problem too. It'll be bigger, heavier, might run warmer etc. And if you lose one out of two engines during flight, that's a much bigger problem than losing one engine out of four.
What is better a 500cc engine or 700cc engine?
if same power output, larger engine will be less stressed
Which is heavier sand or pea gravel?
Same
Is stainless heavier than mild?
almost its same
How machines make work easier?
Simple machines using pulleys and levers, make the work easier by using mechanical advantage. The input force is less than the output, but spead over a larger distance and time. Other machines harness engines and motors, to take over the human input. The motors and engines need a separate source of energy.
How do they differ higher and lower displacement engines?
taking one cylinder , area of bore * length of stroke gives displacement (or volume) of one cylinder , then * number of cylinders = total engine displacement for rough power calculation you can research the equation PLAN/33000
What Make up 50 percent of the atomic mass of the nucleus?
Well, this is not exact, but smaller atoms have about the same number (and mass) of neutrons and of protons. Heavier atoms have a larger percentage of their mass in neutrons.Well, this is not exact, but smaller atoms have about the same number (and mass) of neutrons and of protons. Heavier atoms have a larger percentage of their mass in neutrons.Well, this is not exact, but smaller atoms have about the same number (and mass) of neutrons and of protons. Heavier atoms have a larger percentage of their mass in neutrons.Well, this is not exact, but smaller atoms have about the same number (and mass) of neutrons and of protons. Heavier atoms have a larger percentage of their mass in neutrons.
Are Asian elephants and the African elephants the same specie's?
No. They are quite different.The African is larger, with larger ears, and heavier tusks. The Asian is more often seen in zoos and circuses.
Is a 10 amp power tool better than a 5 amp?
A 10 amp power tool typically provides more power and better performance compared to a 5 amp tool. It can handle heavier loads and work more efficiently on demanding tasks. However, it may also be heavier and bulkier due to the larger motor required for higher amperage.
What is the Horse Power Equivalent of 123CC?
It depends on the engine. Horsepower is a measurement of the engines effect. CC the size... It is possible for engines with the same size to have different effects.
Why must large trucks have more powerful engines than compact cars?
Same reason a bottle rocket wasn't used to lift off the space shuttle. The heavier the load the more power is needed to move said object . I can't believe you asked or thAt I answered
Are bigger objects always heavier?
Not necessarily. An object's weight is determined by its mass and the force of gravity acting on it. While larger objects may have more mass and therefore be heavier, there are scenarios where a smaller but denser object can be heavier than a larger but less dense object.
Why use different gear sizes to get same gear ratio?
The gear ratio is the ratio of the number of teeth in the cogs, so 10 and 20 teeth produces the same effect as 20 and 40. As for why you'd use different sizes, it can depend on the size of the case or housing of whatever transmission, differential, drivetrain, etc. that is involved. Obviously, you'd use larger gears so they can withstand heavier use.
How many horse power is a 249cc engine?
Not enough info to answer. Not all engines of the same displacement have the same power. Please ask new question and include the year, make, and model.
How many horse power in 200cc gy6 engine?
Not all engines with the same displacement have the same power. This being said, a 200 cc engine usually has around 30 horsepower.
Are chicken feet the same or different in males and females?
Males tend to have larger feet to support their heavier weight and roosters will grow spurs on their lower legs
Will a larger bike always have more momentum than a smaller bike?
No.Momentum is a combination of weight and speed, so something lighter travelling faster can easily have the same momentum as something heavier travelling slower.So, if the bigger bike also is the heavier bike, and the bikes are always travelling at the same speed, then it will have more momentum.Otherwise, anything goes.
