Operation
The compression stroke in the cylinder pushed some left over combustion products in the tube, followed by fresh (unburned) fuel/air mixture. When the compression was enough that the fuel reached the red-hot area of the tube, ignition occurred. On early designs, ignition timing was adjusted by adjusting the position of the red-hot spot on the tube—this was accomplished by moving the burner along the length of the tube. Most later styles used a fixed burner and varied tube lengths to change ignition timing.
Read more about this topic: Hot-tube Ignitor
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