Best spark plugs?

[clio_manu]

I have to change the spark plugs to my K4M and I was wondering what are the best spark plugs that I can buy for the K4M??, thanks for the help.

I was thinking maybe the NGK Iridium BKR6EIX what do you think about it?

 

[franx]

NGK are really good, yep. Do'nt know about your type-nr. that you would need. I have the NGK plugs on my RS , were around 20pounds a piece though

 

[sideways danny]

not a fan of any iridium plugs, they break up with the slightest hint of detonation. If you're running without a cat, use NGK BCPR6ES, if you have a cat, use PFR6E-10

 

[Oliver_K4M]

I run Denso IK22 in mine and I´m very satisfied with them. Before without the cams I had the hotter IK20 that are pretty similar to the NGK BKR6EIX.

Other alternative for you NGK PFR6G-9 (double platinum type)

 

[Ralphizzle]

not a fan of any iridium plugs, they break up with the slightest hint of detonation. If you're running without a cat, use NGK BCPR6ES, if you have a cat, use PFR6E-10

NGK PFR6E-10 are also Iridium plugs FTW?

I run Denso IK20's, FYI.

 

[sideways danny]

no, they're platinum

 

[clio_manu]

I run Denso IK22 in mine and I´m very satisfied with them. Before without the cams I had the hotter IK20 that are pretty similar to the NGK BKR6EIX.

Other alternative for you NGK PFR6G-9 (double platinum type)

What's the difference between the hotter one and the other?

 

[Oliver_K4M]

Hotter means, that it will be hotter in the engine under same conditions, because it won´t conduct the heat into the cylinderhead as good as a colder type will.

If the combustion ist hotter (e.g. caused by real tuning like cams or charging), it´s not bad if you go one (or mybe more) step colder, to avoid uncontrolled glow-ignition or knock.