Spark plugs

[williamjernigan]

I was reading my clymers the other day and it said that you could run ngkbr7es spark plugs for a hotter spark. Is this something that any of you guys do or do you just run ngkbr8es?

[frocashmoney24]

just run the b8es or br8es, good plug, ask sredish about the hotter plug, he' really knows his shit when it comes to this, i dont think anyone really needs to run a hotter plug unless they have major engine work done...

[Ducman]

Hotter plugs can get you into detonation problems. The heat range of the plug is also not refering to the spark energy, it is the plugs designed capacity to dissipate heat to the head. Typically if you are running a motor at the outer limit that the octane fuel you are running can handle without detonation due to too much compression and spark advance a colder plug will help keep detonation away. With a plug that is too hot, the heat retained in the sparkplug can ignite the fuel before the spark if there is enough compression/heat in the cylinder. With a colder plug if you don't run the motor agressively enough you can have fouling problems because the plug isn't hot enough to self clean. I believe it was sredish that runs and iridium NGK plug that he claims has a more powerful spark that gives a performance boost. Or you could run a higher voltage aftermarket ignition system. Personally I just stick with the BR8ES or B8ES (both run the same).

[Shee_Man]

In other words would it be a good idea to run say BR9EIX plugs (iridium 9mm plugs).

Since they're iridium they have the more powerful spark like sredish has described in alot of posts... however since they're one range cooler you won't run into jetting/detonation problems.

Also iridium plugs are much harder to foul... so it would seem this would be the best choice... especially if you're running a modded engine.

I'm sure sredish will get in on this post soon

He doesn't miss much.

[sredish]

I wouldn't be changing your heat range UNLESS your plug reading constitutes it. If you don't know where to look for that, then you sure as hell shouldn't be changing the heat plug.

 

Run a BR8ES unless you wanna try the stronger sparking BR8EIX Iridiums. I believe the iridiums do provide a much stronger and hotter (not heat range) spark, but after having some jetting issues I went back to BR8ES's to go back to my baseline.

 

If you try the $7 Iridiums, be sure to check your plugs as the stronger/hotter spark can possibly require a tad richer jetting to compensate for the heat, it can handle it as they are hard to foul, but I did foul one once.

[stclark04]

I run BR8EV's. I like them.

[hamuel]

From what recall reading about BR8EIX Iridiums. They are not real a better spark or hotter. there spark evenly because of the .7mm tip. a broader plug will spark iradicly. The other thing about the plug is they like to melt under detonate/pre-ingition/to much heat causing the plug to ground it's self out and saving the life motor. they are also alot harder to foul. after jetting the bike right. I wouldn't run any other plug. for the simple fact they have proven them selfs to me. and my builder even recommends them after yah get it jetted right.

[sredish]

Iridium is a precious metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200(=F) higher melting point than platinum and conducts electricity better. This makes it possible to create the finest wire center electrode ever. Prior till now, platinum had been favored for long life or performance spark plugs due to its high melting point, also the technology did not exist to machine and bond iridium on a spark plug electrode(at least in a cost effective manner). Iridium industrial spark plugs have been around for years, but still sells for over a hundred dollars per plug. Just now is the technology available to effectively use iridium in a spark plug for automotive applications. The strength, hardness and high melting point of iridium allows NGK to manufacture there iridium ultra-fine wire center electrode to 0.7mm. One of the finest firing points in the industry!

[yamahajunky38]

i thought that the br7es was for a bit of a cooler spark???????