why rotary engines are not used in most of the cars ?
412634
Here are a few reasons I found on the web.\n\nThere are some challenges in designing a rotary engine: \n\nTypically, it is more difficult (but not impossible) to make a rotary engine meet U.S. emissions regulations. \n\nThe manufacturing costs can be higher, mostly because the number of these engines produced is not as high as the number of piston engines. \n\nThey typically consume more fuel than a piston engine because the thermodynamic efficiency of the engine is reduced by the long combustion-chamber shape and low compression ratio.
73996
I'm a "young kid" who drives a Mustang, and I have no idea why my fellows like imports. I think the main thing is that they like to be different and most imports are rarer than the average muscle car.
525435
> The diesel engine,an increasingly popular engine in automobiles has its own disadvantages.\n> For one, the higher compression that makes the diesel more efficient necessitates the use of heavier engine components.\n> therefore, diesel engines remain heavier than petrol engines.\n> Another disadvantage is that diesel engines are difficult to start in cold weather.\n> But plays are available to preheat the engines to provide easier starting.\n> Plugs are available to preheat the engine.\n> Thirdly, diesel engines have been noted for their loud noise and vibration.\n> Finally,these engines are known for the emission of heavy smoke, noise and vibration.\n> however, the popularity of diesel engines still continues,because the price of diesel is low when compared to the price of petroleum.
135016
The Wankel engine is an internal combustion engine invented by Professor Wankel of Germany.  It uses a rotary "piston" instead of the common up-and-down strokes of a standard i.c. engine.  Altho it was first used in an NSU RO-80 [I think that's the correct model number], it was Mazda that brought the Wankel engine into the public consciousness via a sedan as well as the early RX-series of sports car; I believe the rotary-engined Mazdas first appeared in the early- to mid-seventies
1018624
They're a relative ratio. The rpm is how fast the engine's actually spinning, (revolutions per minute) torque is the amount of force generated by the engine. You could have a 4 cylinder engine, but less torque than a v-8. Also the size of the pistons, etc. \n  A model car engine, being small will produce less torque than a full size motor. Also, a function of the drive train is to transfer the torque to the drive tires. Having horsepower in itself is meaningless. Having a gearing in the drive train that puts the "ponies to the pavement" is what really matters.
294135
The Stirling engine is a heat engine that is vastly different from the internal-combustion engine in your car. Invented by Robert Stirling in 1816, the Stirling engine has the potential to be much more efficient than a gasoline or diesel engine. But today, Stirling engines are used only in some very specialized applications, like in submarines or auxiliary power generators for yachts, where quiet operation is important. Although there hasn't been a successful mass-market application for the Stirling engine, some very high-power inventors are working on it. \n\nA Stirling engine uses the Stirling cycle, which is unlike the cycles used in internal-combustion engines. \n\nThe gasses used inside a Stirling engine never leave the engine. There are no exhaust valves that vent high-pressure gasses, as in a gasoline or diesel engine, and there are no explosions taking place. Because of this, Stirling engines are very quiet. \nThe Stirling cycle uses an external heat source, which could be anything from gasoline to solar energy to the heat produced by decaying plants. No combustion takes place inside the cylinders of the engine. \nThere are hundreds of ways to put together a Stirling engine. In this article, we'll learn about the Stirling cycle and see how two different configurations of this engine work. \n\nCheck belows sites working is explained with figures\nhttp://science.howstuffworks.com/stirling-engine1.htm\nhttp://en.wikipedia.org/wiki/Stirling_engine
262837
The big engine weighs more and uses more fuel.  If you are regularly carrying giant loads up steep hills, or pushing a really enormous vehicle, the 400 is the way to go.  But for everyday driving, you really don't need a whole lot of power.  A simple 2-liter four will get you there just as fast for just over half the fuel.\n\nThere are grey areas.  A big, torquey engine geared way down can actually deliver pretty good efficiency. A small engine that's overworked can be inefficient.  A 400 (over 7 liters!) vs a 2-liter is a no-brainer, the 2-liter will use less fuel every single time.  But there are cases, particularly on American vehicles, where the v6 will deliver both more power and better economy than the 4.\n\nRule of thumb: so long as you can scoot around happily without pushing too hard on the gas pedal, your engine is big enough.  Most engines are bigger than they need to be.
23108
The number denotes the number of cylinders. The "V" means that the cylinders are arrayed in 2 banks, usually at an angle of 90 degrees to one another, though the angle can be narrower (say, 60 degrees). A V8 has 4 cylinders in each bank, and 6 in the case of a V12. With 8 cylinders, a cylinder fires every forty-five degrees of crankshaft turn (360/8). In a V12, 1 cylinder fires with every 30 degrees of turn. (Crankshaft is what the pistons are connected to; the up and down motion of the pistons is converted to spinning by the crankshaft). The reason why a V12 of equal size (say, 5 liters) as a V8 generates more power is that cylinders are firing more frequently (30 versus 45 degrees). Thus, there is less 'coasting' in the crankshaft. V12's have a distinctive engine note, as do V8's. V12's are, of course, rarer, and the higher complexity and size mean that they are restricted to supercars and highest-end Mercedes and BMWs: both companies offer 6.0 liter V-12's generating in excess of 450 horsepower.
31292
they work by the combustion causing the engine to spin instead of pistons making the crankshaft turn the motor.  Like a waterwheel, sort of.\n\nIt seems like they should be much more popular, but there's trouble with the power and using them long term to pull heavy loads.  Otherwise it's a great engine with a good concept that just doesn't seem to have any big market.
287174
I owned a SR20DE (01 Nissan Sentra SE)- this engine is nearly indestructible, the reason I bought one. I would thrash that car on a daily basis, and it gave me 75,000 trouble free miles. The engine dates back to the early 90's SE-R and also showed up in the 200sx and Infiniti G20. The Turbo showed up on more sporty cars like the Silva. The turbo charged versions (SR20DET) have been documented in many tuner magazines and from what I remember could be tuned up and over 400hp. \n   In direct comparison, the internal makeups of theses two engines is the biggest difference. Every thing in the SE20DET is built for heavy lifting(bigger thicker rods..etc..). The Ka24DE(T) is made of lighter parts, which obviously make them more susceptible to breakage.\n   I say old ways are best, there is a huge information base the SE20DET, the KA24DE(T) is only a few years old, hence less support and less knowledge.
96519
Probably for the same reason there are lowriders and chopped motorcycles...cuz they can. In my day it was cubic inches and horsepower. For the life of me, I can't figure out why someone would spend thousands of dollars to make a car jump around like the devil is behind the wheel. But I do admire the hard work and innovation that goes into making it happen. Don't ask why, admire the work and move on if it isn't for you. C'mon...some of them are actually pretty cool :).
102705
Manufacturers will not release it because the car will be too good...hence they will not sell as many cars later.
540356
For a rotary compressor,air passes through two meshing gears. As the gears rotate, the air passing to it is being compressed.\nFor a reciprocating compressor, the air is compressed in the cylinder by a piston.
466001
Busch series cars typically have less horsepower which is supposed to keep their speeds down, though on the superspeed ways where they have time to accelerate they can come close in top speed. There are some other minor details that are different. Namely the fuel tanks and the lenght of fuel line that a car can have etc. Oh, and since the cars are less expensive it makes it affordable for smaller owners to get involved. This also translates to smaller prize winning for each race.
874055
Here is a link to a stirling engine design that uses hydraulic fluid to couple its pistons to the shaft.  It may not be the answer to your question, but it is interesting.
110531
More power obviously.\n\nYou also get less vibration with multiple cylinders, because they can be designed to balance each other (some going up while others going down, etc.).
926519
had a red button on my first car. It was a Golf and the red button wasn't wired to anything. It was a cool square big red button that I was told not to touch when I first got the car. No one knew what its purpose ever was, but when I drove I'd pretend I was hitting turbo whenever I hit the button!