How to Make Your Car Last Forever: Avoid Expensive Repairs, Improve Fuel Economy, Understand Your Warranty, Save Money

The next stroke in the cycle is the compression stroke. The air-fuel mixture fed into the combustion chamber
becomes much more volatile and explosive when compressed 8 to 12 times its size. Piston rings and valves
must tightly seal the precious air-fuel mixture in the combustion chamber to realize maximum efficiency.