I race 1/8 scale off road buggy. I have been out of the game for a couple years .my current engine is a pico evo 2 . I purchased some o s plugs from hobby town ,and they have short bodies on them making an odd combustion chamber . can someone give me a detailed explanation of these short bodied standard glow plugs and why they are used . also will this be detrimental to me and my engine ?