CR9EK's???

[yamaha1973]

I have heard good things about the CR10EK's but i have some CR9EK's lying around... I know that they are hotter plugs but i was wondering if you see the same type of results? Any feedback would be great!

 

[Indy]

they were all dyno'd, the cr10ek had the best results.

 

[fourload]

cr9ek will work fine too. They are also less likely to foul which I have done with the 10's.

 

[yamaha1973]

so the dual electrode is the key?

 

[fourload]

I heard they produce a better flame front than reg plugs,therefore better combustion and a little more hp!!

 

[Sled Dog]

cr9ek will work fine too. They are also less likely to foul which I have done with the 10's.

I have found the opposite to be true the 10's dont foul as much as the the 9's. Mind you this is in the summer starting the sled every month or so and let it get to operating temp.

 

[fourload]

I fouled the 10's in my old RX1'S a few times and have used the 10's and 9's in my Apex with no problem. The 9's are slightly hotter.

 

[daryl506]

WHAT ABOUT THE IRIDIUM PLUGS ANY GOOD?

 

[yamaha1973]

not worth the money imo

 

[daryl506]

Why aren't they worth it. And why the colder ones

 

[yamaha1973]

dont think theres any performance increase your going to get to pay $15+ each for the iridium... Id only use them in a mercury optimax