I really need this answer for my notes....
2006-11-23 19:10:35 · 6 answers · asked by anki_veela 1 in Cars & Transportation ➔ Other - Cars & Transportation
wow, what a bizarre bunch of answers, the intake is bigger because the air/fuel charge is being drawn into the cylinder by atmospheric pressure only, the piston rises (compression ) spark occurs at/near tdc. power stroke throws the piston down and as it starts back up the exhaust valve begins to open and the piston forces the spent charge out the smaller exhaust valve at a greater pressure and rate than atmospheric pressure. hope this helps.
2006-11-24 04:05:31 · answer #1 · answered by sterling m 6 · 0⤊ 0⤋
On a 4-stroke engine, when the intake is open, it draws the air/fuel mixture in by vacuum, the piston moving down and drawing the mixture in.
On the exhaust stroke, the piston is moving up, forcing the burnt (and unburnt) exhaust gases out under pressure.
Just a quick note on multi valve per cylinder engines:
For years, bigger valves and valve seats were installed to allow more breathing in the combustion chamber.
It was found that once a valve got too big, the valve face tended to block the flow of things.
Better breathing was accomplished by installing multiple valves of smaller face diameter.
2006-11-24 00:39:53 · answer #2 · answered by strech 7 · 0⤊ 0⤋
Well the best answer I can give you is this: the intake is larger because the air/fuel entering the cylinder relys entirely on atmospheric pressure to move the air into the cylinder. The exhaust on the other hand is forced out by the explosion from the power stroke. I guess that would be it in the simplest terms.
2006-11-23 19:18:18 · answer #3 · answered by R.W. 3 · 0⤊ 0⤋
Fuel goes thru intake at a larger volume ,after it is combusted ,
burned ,Its volume is smaller heat rises faster in a smaller chamber also... First its a hydrocarbon fuel then becomes waste
gases known as 4 gas theory H2o,H2C c2o dioxide monoxide etc...these are the gases that get checked every annual auto inspection..
2006-11-23 19:40:30 · answer #4 · answered by Mudd 3 · 0⤊ 0⤋
Your answer is there's less gases to release after combustion take's place,raw gas is burnt and spent so less gas to pass after the combustion cycle is your answer . I truly hope you find this answer more than useful and answers all your question's
2006-11-23 21:05:09 · answer #5 · answered by skanken808 2 · 0⤊ 0⤋
bigger inlet port gives extra air for combution which helps in less emission and fuel efficency.
2006-11-23 20:51:13 · answer #6 · answered by Anonymous · 0⤊ 0⤋