The spark wants to jump from a sharp edge to a sharp edge. The cut back electrode allows that to happen more out in the open. HP wise, in dozens of back to back dyno tests, I have never seen ANY difference in HP or torque that wasn't within the window or variation for the dyno. This includes heat range variation of 2-3 steps. Maybe there is 1/2-1 1/2 HP difference? But how do you know it's for real? Engine Masters video's report the same basic results. But these tests are not long term, taking into account choke start-ups, extending idling, cold weather operations. The right heat range plug will maintain optimum performance longer. HP increase, you will need to find it somewhere else.
|