Do any of you know who makes the “Hottest” hot glow plug? I have found that by using the hottest glow plug I can find and running the engine rich produces the most top end power without hurting the engine. So far I have found the Merlin Hot Plug to be the hottest. Is there another that is hotter?

As for the long and short issue, the plug should go into the head so that no threads are showing when fully tightened. Longer is acceptable shorter is not.

Bob