Posted: Thu May 01, 2008 10:45 am
Gasoline engines use the compression stroke to release more energy on the power stroke. It isn't absolutely necessary for combustion. On diesel engines however, it is required.
@ Cosmic Muffin True, gasoline itself doesn't combust but it has a very high evaporation rate. The vapors mixed with air causes the combustion. This is the reason why so little fuel is needed per stroke. If the amount being injected is equal to the amount being vaporized and combusted then there is no reason to fear flooding. However too much or too little per stroke can result in flooding as too little would not ignite and collect beyond the ignition ratio while too much saturates the air to a point where there isn't enough oxygen to reach igniton.
@ Cosmic Muffin True, gasoline itself doesn't combust but it has a very high evaporation rate. The vapors mixed with air causes the combustion. This is the reason why so little fuel is needed per stroke. If the amount being injected is equal to the amount being vaporized and combusted then there is no reason to fear flooding. However too much or too little per stroke can result in flooding as too little would not ignite and collect beyond the ignition ratio while too much saturates the air to a point where there isn't enough oxygen to reach igniton.