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My opinion comes from the crossover book at Advance Auto. I put them in and everything improved...easier starting, a slight performance gain that I could actually feel, and they burned cleaner and lasted longer than than the NGK BP7ES or the Champion N7. All good stuff. So I have not tried another heat range. However, if you have been using the IW27 with no ill effects, I'm willing to give them a try. NYC is a good endorsement, can you name other people? Please supply.Changing brands of spark plugs is a minefield. The heat ranges are not exact duplicates of one another and many times one company will claim their plug is good for 4 different heat ranges of another company. Go to Iridiums and it throws in a few more variables. I know too hot a plug can put a hole in a piston so I'm cautious. I have a theory that the iridiums burn a little hotter than the BP7ES and that's why there was an improvement all around. Just a theory. A friend gave me a pair of E3.34 spark plugs and they were better than the IW22 but they burned bright white and I was worried that they might be too hot so I went back to the IW22. Does the IW27 hold the heat longer so the plug stays cleaner in operation?
My opinion comes from the crossover book at Advance Auto. I put them in and everything improved...easier starting, a slight performance gain that I could actually feel, and they burned cleaner and lasted longer than than the NGK BP7ES or the Champion N7. All good stuff. So I have not tried another heat range. However, if you have been using the IW27 with no ill effects, I'm willing to give them a try. NYC is a good endorsement, can you name other people? Please supply.
Changing brands of spark plugs is a minefield. The heat ranges are not exact duplicates of one another and many times one company will claim their plug is good for 4 different heat ranges of another company. Go to Iridiums and it throws in a few more variables. I know too hot a plug can put a hole in a piston so I'm cautious. I have a theory that the iridiums burn a little hotter than the BP7ES and that's why there was an improvement all around. Just a theory. A friend gave me a pair of E3.34 spark plugs and they were better than the IW22 but they burned bright white and I was worried that they might be too hot so I went back to the IW22.
Does the IW27 hold the heat longer so the plug stays cleaner in operation?
