I'll keep it brief...
Originally posted by Jake
I've been meaning to get in on this thread but time seems to be at a premium over here lately. So I'll just keep this short.
I've wanted to learn more about surface gap plugs and now that we're talking about it, I may as well ask. I know what they look like but I don't know or understand the advantages. Could someone please explain it?
I like the cleaner design of surface gap plugs but what’s the disadvantage? Spark just not far enough into the chamber to support cold start?
What could possibly be the disadvantage of increasing spark energy? I understand plug life may be compromised but who cares about that, right? :p
Multi spark set ups, again, are there any disadvantages?
I'm not an engineer. I can't test concepts. Because of this I have to rely on a crude logic that if it can't hurt, but there may be benefits, then that's reason enough for me.
Surface gap plugs make the best flame, there is NOTING in the way to distort the flame kernel. Then the whole ground becomes the electrode. This will produce a better spark, and put it in the right place. Thus giving more power and a better burn. On the M3 they are a COLD plug, so they foul, just like the XR4CS plugs.
Disadvantages are, price, and heat ranges, usually need a higher voltage to work well.
Multi spark boxes, are suppose to burn more of the A/F mixture giving more power, it really helps with throttle response and low end torque. I believe they also compound the burn to give added thrust to the piston. They also lower emissions.
Down side, need more control over spark, plugs wear a lot faster.