rotary engine

a rotary engine is a completely different kind of engine. it does not run on cylinders although the 4 step combustion process is technically the same, but accomplished in a different manner. there is a triangular shaped rotor inside a housing that spins arround. the rotor is made so that each corner of the rotor is touching the side of the housing. this creates the space for the fuel/air mixture. ummmmmmm for furthur info read this...http://travel.howstuffworks.com/rotary-engine.htm..... this site has a pretty good explanation on it.
 
many car companys tried out the rotory with lots of problems but only mazda put the effort in to perfect it:)
 
and a whole bunch of other mazdas beside RX7's that have them

ford and chev both tried there own rotor to no avail
 
plus the stock motor in an RX-7 is really strance, the secondary turbo kicks in like a ton of bricks. plus it can't really handle high amount of boost unless you check EVERYTHING (especially the apex seal...sort of like the head gasket on a normal engine) also the mufflers on stock rotaries are pretty restrictive cause they are a bit louder than normal motors, and they have a different pitch to them :D (sounds good imo :embarrassed: )
 
piston engine has been developed much longer and is much older. maybe if someone invented the rotary instead of the piston engine first..the rotary would be better.
 
If you want to go for the most reliable, the piston engine is the best since all of the car manufacturers provide the parts. If you want to save parts and go for an engine with the least amount of parts, then the rotary is for you. That's what I think is the best of the rotary engine. Since it has less parts, there's less friction so that means that more power can be pumped out. And also, that's why it can rev so high compared to the engines that use pistons.
 
conceptually from an engineering point of view... the piston engine is a much simpler idea that requires less mathematics to invent... the rotary engine on the other hand needs a lot of mathematics to create the shape as well as correctly time the spark plugs to completely ignite the rotating fuel air mixture... personally i think that the rotary engine is the better engine... as someone said it has less friction due to its less parts... and also can come in a smaller volume... this makes a lighter engine capable of producing power with fewer things than can go wrong like timing belts and such and so on...

as someone else said the rotary does guzzle gas... but then again so does any performance vehicle... and so did every engine when it hadn't been perfected... the rotary engine is still growing and it will become much more versatile than the piston engine... just give it time...
 
hey that how stuff works site is what explained much of rotary workings to me a while back lol... ahht he beauty that is internet
 
Originally posted by Thio
If you want to save parts and go for an engine with the least amount of parts, then the rotary is for you. That's what I think is the best of the rotary engine. Since it has less parts, there's less friction so that means that more power can be pumped out.
Click to expand...

if you want a piston engine but you dont want all the parts get a two stroke:)
with glow plugs :)
 
two stroke and fourstroke engines are basically the same thing..

four stroke implies following otto cycle... and using four strokes per power producing cycle...

two stroke implies using a diesel cycle which means no spark plugs... this is the main difference between the two types of piston engine... with the two stroke the extra two storkes in the fourstroke engine are not needed because fuel intake and piston expansion are combined... as is fuel exhaust and piston compression ( this is also where the combustion of hte fuel occurs...

diesel engines rely on compression to combust fuel while four storke use spark plugs...

this is the reson for different fuel types...

with a fourstroke engine... wether piston or rotary ( rotaries are fourstroke) the octane of the fuel will determine how much the fuel can be compressed safely before combustion... the higher the octane the more compression before combustion... if you use too low of an octane rating for a high performance vehicle... it will perform as a diesel engine should... exploding the gasoline prior to the spark plug ignition... this causes engine knock... which is extremely detreimental to your engine...

a two stroke is no where near as good as a rotary in terms of performance capabilityies... a two strokes advantage comes in with fuel price... it can be very cheap... and ease of consturction... not much computer stuff will be needed it is mechanically goverened and no variance can be achieved...

on the other hand because of the availabilty of higher octane gases... a fourstroke can have a greater storke length along with other aspects and create more power in each power producing cycle...

for maximum performance a two stroke would not be the way to go... and it would not be nearly as light as a rotary engine or even have a comparable amount of moving parts as a rotary engine
 
that how stuff works stie actually has lots of valuable information that anyone can understand on not only cars but a lot of other things as well. its pretty kool to check out cuz they got pretty intersting flash demonstrations.
 
you also get 2 strokes that have sparks plugs and dont depend on combustion
 
a 2 stroke V6 with provide more power than an equivalent 4 stoke V6 per revolution due to the 2stroke firing 6 time a revolution and the 4strokie only firing 3
 
i was talking about there ideal cycles... you know otto and diesel...just to explain the basics...

that is only true if the equivalent stroke length.. cyl volume.. and fuel are the same... and the only way for the fuel to be the same spark plugs would have to be used... eq stroke would have to be greater than half of the four stroke and the cyl vol again at least half...

if the engines and fuel are identical but the cycles vary... the two stroke should create twice hte power and consume twice the gasoline...

a two stroke piston engine will operate at twice the rpms of an power equivalent fourstroke... twice the revs in an engine with a lot of moving parts and therefor friction will seriously limit the horsepower than can be emmited by this type of machine... if its equivalent hp... however if its the same engine but different cycle the engines revs would still be limited possible limiting the power but probably not enough to generate more hp than an eq four stroke... i guess that is average power every time i say power...

still the egine would be mechnically the same... and with spark plugs also meed complex engine management... thus the rotary would still have the same advantages that i spoke of before
 
this is why on motor bikes they can leave the capacity down by useing a 2 stroke and still provide the power

the 4 stroke engine need to increase the capacity to achieve the same power

4 stroke is cleaner and quieter
also on 2 strokes the exhaust has to be tuned exactly to produce the most power out of it
a 4 stroke this is so necessary
 
Originally posted by bengee
two stroke and fourstroke engines are basically the same thing..

four stroke implies following otto cycle... and using four strokes per power producing cycle...

two stroke implies using a diesel cycle which means no spark plugs... this is the main difference between the two types of piston engine... with the two stroke the extra two storkes in the fourstroke engine are not needed because fuel intake and piston expansion are combined... as is fuel exhaust and piston compression ( this is also where the combustion of hte fuel occurs...

diesel engines rely on compression to combust fuel while four storke use spark plugs...

this is the reson for different fuel types...

with a fourstroke engine... wether piston or rotary ( rotaries are fourstroke) the octane of the fuel will determine how much the fuel can be compressed safely before combustion... the higher the octane the more compression before combustion... if you use too low of an octane rating for a high performance vehicle... it will perform as a diesel engine should... exploding the gasoline prior to the spark plug ignition... this causes engine knock... which is extremely detreimental to your engine...

a two stroke is no where near as good as a rotary in terms of performance capabilityies... a two strokes advantage comes in with fuel price... it can be very cheap... and ease of consturction... not much computer stuff will be needed it is mechanically goverened and no variance can be achieved...

on the other hand because of the availabilty of higher octane gases... a fourstroke can have a greater storke length along with other aspects and create more power in each power producing cycle...

for maximum performance a two stroke would not be the way to go... and it would not be nearly as light as a rotary engine or even have a comparable amount of moving parts as a rotary engine
Click to expand...
Actually thats not true. A two stroke means in only revolves twice per cycle. It has nothing to do with sparkplugs or diesel. A four stroke will have 4 different strokes per cycle, intake, compression, power, and exhaust. The two stroke combines the compression intake and the power stroke as well as combining the exhaust and the compression.

I'm not positive if this is right because its just off the top of my head, but I'm pretty sure.
 
Originally posted by bengee
i was talking about there ideal cycles... you know otto and diesel...just to explain the basics...

that is only true if the equivalent stroke length.. cyl volume.. and fuel are the same... and the only way for the fuel to be the same spark plugs would have to be used... eq stroke would have to be greater than half of the four stroke and the cyl vol again at least half...

if the engines and fuel are identical but the cycles vary... the two stroke should create twice hte power and consume twice the gasoline...
Click to expand...

the fuel can never be the same because the fuel on a 2 stroke needs oil in it to lubricate the engine

2 strokes dont have a sump with oil in it so they use the fuel as the lubricant thats why when you see one going you see blue some pouring out of it
because the buring oil
 
stevie mo... i was talking about the ideal cycles around which the two stroke and four stroke are modeled... they have everything to do with diesel and otto cycles...

even if they cannot have the same fuel... substitute equivalent fuel in... all i meant was that it would have to either combust at the displacement volume... or be able to withstand this volume change without combusting... basically all i was implying was that inorder to produce similar power with a similar engine... it would need a fuel that...like a fourstroke... needs to withstand higher compression ratios
 
the engine is not mechanically the same (as a 4 stroke) because the 2 stroke doesnt require any valves or cams etc (neither does the rotor)

a single cylinder 2 stroke has a three moving parts crank, con rod, piston. besides the ignition timing distributor(which a rotor needs aswell) and all the other parts eg. water pump, fuel pump etc

the rotor and 2 stroke moving parts are about the same, 2 stroke has alittle more

2 rotor = 1 crank, 2 rotor
2 piston = 1 crank, 2 piston, 2 conrod

but then again a 2 rotor rotory will most probably produce more power than the 2 stroke

a two rotor rotory (eg. 13B) will fire 6 times in one revolution
a 6 cylinder 2 stroke will also fire 6 times in one revolution
but a 4 stroke will only fire 3 times in one revolution
you would need a 12 cylinder engine for a four stroke to fire 6 times in one revolution

this is one reason a small capacity rotor can produce power that only a larger capacity 4 stroke or 2 stroke can make
this is also why a rotor uses alot of fuel for a small capacity

if we want to talk about the internal combustion engine that uses the least a mount of moving parts then i guess that would be the SCRAMJET which has no moving parts(wont work unless moving at very high speeds)
 
i know that a 2 stroke has no valves... hence the fuel and expansion being sucked in at hte same time...

i still think the rotary will eventually become the most versatile of the engines available today... i also think that the fourstroke will eventually become extinct...

a modern two stroke will never be as efficient as a four stroke becuase a two stroke will always have incomplete expulsion of exhaust gas and expulsion of unbrned fuel... and as i said before they are easyier to make...

you are right that they... like the rotary have a high power to weight and volume ratios...

there is a two storke under development that works to imporove the efficiency with fuel injection and valves... these valves prevent the loss of fuel to the air while the exhaust valve is closed and fuel is being injected... usually fuel will be lost in a regualr two stroke... in addition the fuel air mixture is altered so that the fuel is not uniformly spread throughout the volume but more dense near the spark plug... i have no idea how this is accomplished... but it aids in complete fuel consumption...

i was mistaken about a diesel cycle idealizing all two stroke cycle... it is only one kind... a spark plug in a two stroke cannot be idealized by diesel becuase diesel is as i described above... anyways...

a scram jet engine is not an internal combustion engine... air is slowed down... fuel is added.. the fuel air mixture is burned... the gases expand and thus acc through a a properly shaped duct to perform at supersonic velocities of air.. that further accelerates the gases and creates a net force acting in the direction opposite of hte expulsion gases... no internal parts where combustion is performed... everything is done in a tube that is open on both ends to the environment, if you will
 

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