I'd have to look it up. Used to know, but it has been a little bit since I was last discussing the finer points of glo plugs. What I do know is that most engines do not work so well with them and most engines are not really designed for them. That is why I recommend checking the owner's manual for the engine in question. They are usually really good about defining what and what can not be used in the engine.
While I generally do not like making mistakes, I do like to make certain I find the correct answer and put it out there. So, Olds...here is what I found out about the infamous idle bar.
IDLE BARS
Idle bar glow plugs came about because some engines were having trouble transitioning from idle to high speed. When the throttle was opened from idle, the incoming air and raw fuel would strike the glow plug's heated coil, cooling it to the point where it would no longer support the combustion process, so the engine would die. To help prevent this, the idle bar was added to the glow plug to serve as a physical shield, helping to keep the coil from cooling off too quickly.
A glow plug with an idle bar will not increase peak RPM (it may even reduce it in some cases), but it may improve the idle with some engines, since it simply helps to keep the plug hot enough to light the fuel. If your having transition problems, you might want to try using a glow plug with an idle bar. Some modelers use idle bar plugs in the winter only, since the glow plug tends to loose heat faster in the colder environment.
Naturally, all of this assumes that you have the low speed mixture adjusted correctly to begin with.
The above information came from this site, and is a direct quote:
http://www.scootworks.com/rdrc/gloplugs.html
Here is an image of a turbo plug:
Click the following link at OS. The first bullet on the site gives information about turbo engines versus standard.
http://www.osengines.com/accys/choosing-glowplugs.html
Hope this sets the questions to rest and makes up for my goof up.
-SkyMaxx
