| Author | Message | ||
     Dvc357 |
Good day brothers I'm sliding this post over from the M2 threads as i only got one hit over there. What is the best spark plug for my 2002 M2? Right now i'm using NGK DCPR9E IX Iridiums. Those are one step cooler then HD recommends. I found them for $6.75 on Evil Bay. BUT, I have found a vast pool of technologies in spark Plugs. "Electrode-less", Multiple Electrode, A wide variety of materials. I dont think there is significant difference; however, i was wondering if anyone has actually tried some of the new wonder plugs out there. I ride hard and fast at times but am primarily A commuter. Im at 6000 ft elevation and the Iridiums do work fine. As an example, ive never tried Autolites. | ||
| Bluzm2 |
Michael, Stick with what works. I've mostly used the stock 10R12's or maybe a NGK replacement. The hassle is they use different wrench sizes. If you run hard and fast going a stop colder isn't a bad idea as long as the color is still good. | ||
| Jayvee |
"the best" meaning... best at what? I got the Denso Racing plugs, they're like $30 apiece. Has to be the best, right? Supposedly last the "life of the engine". Can't tell any difference by seat-of-the-pants though. I'd guess hard to find any difference via dyno, fuel-economy, or any other short-term test. Similar to the comments about single-fire, it's not a limiting factor, not that important for a street motor like mine. Oh well. | ||
| Robertl |
A spark plug is a spark plug. Stick with stock matching number unless something has changed with the engine (big changes: compression, head porting, boost, etc.). Sometimes there will be a stock chart for different temp plugs based on climate (1 step hotter or colder). Platinum and some of the other metals used do last longer and often maintain a more consistent spark over their lifetime since they wear less. I do like the platinum upgrade options because they do last longer. Multi-electrode is more of a sales gimmick. Don't believe anyone has proved any improvements. It is only going to spark once. More surface area could mean a more consistent spark over the long term but more than likely you'll replace them again long before needed. |
