ONboard glow igniters have a place, especially in inverted engines. Most will turn on at a set throttle setting, IE when the throttle is at 4K rpm or less, the onboard kicks on, and above 4K,it turns off.

One of our guys, a former club presendent, has designed a glow igniter the checks the resistance of the glow plug andwhen it starts dropping, indicating a cooling plug, it kicks in the onboardglow. No need to coupleit to a throttle setting, when the plug starts cooling down, the onboard glow kicks in.

This setup, or one coupled to throttle setting is a good idea foran inverted engine, Anything that willkeep the glow plug hotat lowRPMs isa plus. However, a poorly tuned engine will not be helpedby these devises. They are an aid, not a crutch.

Don