Why do car makers not use two stroke engines? Arent there many advantages?

Answer 1

In a 2-stroke engine, the exhaust gasses are cleared from the cumbustion chamber at the same time as the fresh petrol/air mixture is drawn in, unlike a 4-stroke engine, where they happen in separate strokes (hence the extra strokes). The disadvantage of 2-strokes is that you have unburn fuel going out with the exhaust, or exhaust gasses remaining along with the fresh fuel. This leads to wastage and pollution (but a lot more power, as the engine fires twice as often as a 4-stroke, and a very quick revving engine, as it has very few moving parts). Another disadvantage is that oil is mixed with the fuel, so oil is always being burnt, another pollution causer. Specific to cars, two stroke engines work well at smaller capacities, but not with larger capacity engines. With the march of time, the advantages of a 2-stroke are negated by large capacity 4-strokes that run a lot cleaner.

Answer 2

Two strokes have many advantages when it comes to power vs. displacements but the ecologicale disadvantages do not make them feasible. They need a oil to gas mix for lubrication and since it would be nearly impossible to make them all the same buying gas for them would be a nightmare to say the least. They do not burn clean enough to adhere to EPA guidelines for passenger cars which is why 2 stroke bikes are not street legal either.

Answer 3

not really many advantages, just more power (hey, that's really not such a bad thing!). but 4 stroke motors get better fuel economy and pollute less. right now the ATV, snomobile, and PWC makers are converting to 4 stroke motors for the same reasons.

Answer 4

another reason for why car makers do not use two stroke engines is becaues you have to mix the oil into the gas

Answer 5

one big disadvantage. two strokes have oil mixed with the gas. big pollution thing. actually detroit has a 2 stroke deisel for industrial use but much too comlicated and expensive for us normal people.

Answer 6

aside from the fact that 2strokes have much higher emissions and will burn up if your injection oil tank goes dry

they wear out to fast if you Had to buy a new motor after 10,000 miles it would be very cost prohibitive

and try to sell a snowmobile with 10,000 miles, my car has about the same miles on it and its still considered brand new

Answer 7

emissions, you can't even run a 2 stroke dirt bike made after this year I believe on anything but a closed loop course (mx track)

Answer 8

two stroke = more power.
four stroke = cleaner air.
i hear they are even making four stroke weedeaters and chainsaws these days.
its just not fesable being such a gross polutant.

Answer 9

quicker wear...just a guess