Do rotatory chambers count? They explode gasoline and air. If they count, then 11 (4,4 & 3).
8 on the Grand Cherokee
1 on the lawn mower
1 on the pressure washer
5 on the jars of jalapenos
“Travel is fatal to prejudice, bigotry, and narrow-mindedness..." - Mark Twain
20 on 2 cars and truck
3 on 2 lawn tractors
1 on snow thrower
1 on compressor
1 on walk behind rototiller
1 on generator
I on weed whacker