ORIGINAL: RCIGN1

A 289cc twin picks up at least 500 rpm switching from gas to glow, runs the same with ignition or glow plugs...The G26 in the above post was tested both ways..Only change from stock was the carb, used a carb from a glow G23...Walbro WT499....
The 289 twin ran just as good timed a 22 BTDC as it did timed at 28 BTDC...The only reason we used ignition on that one was the compression was so high the center of the glow plugs would burn out from the heat...I had 5 glow plugs in each head. The center melted out of the middle one..The heat coming out the hole melted the steel hex on the center plug just like a cutting torch....We put spark plugs and ignition on it with glow fuel, 0 nitro, and had no more problems..Ran exactly the same...
Glow plugs last indefinitely in a big gasser..We ran the same glow plugs in our 289 at the races for 2 years..When the plane crashed and demolished the engine the glow plugs were still in it.
I have them here, maybe they'll get framed..The plugs are McCoy #9......