On 8/30/2016 5:00 PM, Tim Wescott wrote:

...
Air needs to get in, fuel needs to get in, the air & fuel need to be
heated up to ignition temperature,

it has to have spark (at the right time!),

it has to be able to work on the
piston, and then it has to be expelled before the cycle repeats. If one
of those is missing, it ain't gonna work.