Yep....I'm sure about that. In fact, when I started out in r/c, I just assumed
that idle bar plugs were for engine's that idled, and plain glow plugs were for
engines that ran wide open, like c/l engines. Then one day a friend (he and his
son were into c/l carrier competition) asked me why I was still using idle bar
plugs?
Well, long story short, he proved to me that the engines (K&B .61's) would
not only run better, but idle better without the idle bar. The reasoning, which
proved to be true, was....why would you want to block the fuel from the fire.
If you want something to ignite, why would you block, or hamper that from
happening ?
It is more likely to throw raw fuel at the glow element, against which
the idle-bar is supposed to protect.
The carb mixes the fuel with the air. If you have such a junky carb, that when
the mixture in the combustion chamber is still in a "raw fuel" state....you need
a better carb....not something blocking that mess from getting to the fire.
I think Duke Fox invented the idle bar plug, in a vain attempt to keep plugs from
drowning out from the "splash of fuel" coming from those pieces of junk he
called carburetors. [X(]
Bottom line....the baffle on the piston doesn't cause droplets of fuel to get on
the plug....rather it is for scavenging the cylinder....oweing to the lack of
scavenging found in the later Schneurle type engines.
FBD.
