NGK LFR7AIX 1 step colder plugs

I have a brand new box (of 4) NGK LFR7AIX spark plugs. These are one step colder than stock. Intended for 2005 STi.

$25.00

 

sorry to newb. but what does one step colder mean? do they burn cooler?

 

helps combat pre-ignition

 

sorry to follow the newbness, but what is pre-ignition.

also dream sorry for cluttering your thread.

 

umm...I'm in need of some plugs. Anybody know they'll fit my 02 WRX?

 

Colder plugs means they conduct heat away from the spark plug tip faster. Therefore the tip stays cooler and won't pre-ignite the fuel/air mixture from being too hot(ignite the mixture before the spark does). The charge gets hotter with more boost/compression/etc and thus the plugs gets hotter as well. When your charge ignites before its supposed to, you get knock, and its basically like taking a large hammer and hitting the dome of your piston with it, which is obviously very bad.

Detonation is a bit different, and I won't get into that.



Good deal on plugs BTW.

 

will not fit.

 

if you bring them to the ice race and I will take them. im assuming they fit the 04 also

 

I can do that.

 

If Rich does not take them and these are not the "copper" plugs I here about I will take them. In other words factory type plugs just colder.

 

i think they are irridium not copper

 

rich if you are going to run race gas you need coppers

 

I didnt know that, yes I will be running lots of race gas

 

stick to them and there cheaper too..

 

Sounds like there all yours now. I ran these with race gas all the time with no problems :dunno:

 

Well if he wants them then he can have them otherwise I will take them. Just about due for some new plugs. I will get them from you at Ice Races if he does not take them.

 

Still available bump....

 

fine! bee wants them! DIBS! call me tomarrow

 

I can swing them by Wed. night son, ill call j00.

 

sick!