Spark Plugs for K20

[kiwitrains]

Due for spark plugs soon 100K I know Honda will charge the earth for them anybody seen them at reasonable price, I saw them on Ebay from the US for around $AU80 inc shipping seems to be a good price.

[EG5]

We sell NGK iridium IX for $60 ( set of 4)
Postage $15 on top

[kiwitrains]

Thanks for that do you have the IZFR6K11 ?

[kiwitrains]

I am getting a few confused suggestions on spark plugs for my Civic Sport 2009 K20, the book says IZFR6K11 if you go to the NGK website they say IFR7G-11KS which ones has anybody used.

[sensei_]

Looks like the difference between the two plugs you listed are the heat range, centre electrode projection and height.

IFR7G-11KS (http://www.ngk.com/product.aspx?zpid=9799)
IZFR6K-11 (http://www.ngk.com/product.aspx?zpid=9848)

[kiwitrains]

That's correct sensei_ so which are the correct ones?

[sensei_]

both will be "correct". i reckon it is now a matter of what you want to use personally.

[Mikeyy168]

colder heat rating plugs for more modified engines from what i could gather... from what ive seen a lot of people go for the 6 but ive got Denso IK22's which is heat rating 7 equivalent.

the previous owner had some HKS 8 heat rating in there... lol