*spark plugs require a decent amount of energy to function* Are you sure about t...

tnorthcutt on July 2, 2014 | parent | context | favorite | on: No crankshaft, no problem: Toyota's free piston en...

spark plugs require a decent amount of energy to function

Are you sure about that?

According to [0], "To ignite a stoichiometric air-fuel mixture (14:1) approximately 0.2 milliJoules of spark energy are required. Very rich or lean mixtures can require as much as 3 mJ."

[0] http://www.mr2.com/TEXT/DavidKucharczyk/ignition.html

schrodinger on July 2, 2014 [–]

(0.2 millijoules * 6 * 3000) / minute = 0.06 watts

So yea, not much...