Okay, I have two sets of plugs for my engine. Both Champion. One has what I believe is called a projected tip. The other set does not. There is no likely hood that the projected tip will be hit by anything. It's a low compression engine (more or less 7-1). So the question is... Assuming the same heat range, any benefit from using the projected tip vs the regular tip? (these are the old plugs and I'm getting ready to get a new set)

Thanks:
Paul

An extended tip plug is often advantageous because it moves the ignition source point away from the wall of the combustion chamber and out into the center of the chamber where it will be more likely to burn faster due to increased charge motion and a more centralized source of ignition. This can mean a more efficient engine because the peak cylinder pressure point will occur sooner, at a time that is better for producung more torque on the crank pin. Also, less negative work will be done in the compression phase since timing may now be retarded.

Here are some extended tip plugs:

FTF:
Thank you for the information. Very helpful.