Are iridium plugs already installed in the 8?
 

Should i replace the plugs on the 1st 1k servicing? And are iridium plugs already standard? Any recommendations?

u mean OEM iridium or the denso ones?

I believe they are iridium plugs in the car. I kept the original plugs on the car for 40K miles, and replaced according to the maintenance schedule. I had no issues with the plugs.

dag

The stock plugs are Iridium, Emperor. Leave them be........

i was wondering whether there are better ones when its time to replace them

if u read the rx8 bible... they are recommending the ones from denso

they have the ones specially for rx8

http://www.globaldenso.com/PLUG/raci...neup_irl01.jpghttp://www.globaldenso.com/PLUG/raci...neup_irt01.jpg

these 2 look similar... but looking at the website... its different.. how different they are, i dunno

Perhaps one is the leading and the other is the trailing plug?

i tink so... wats leading, wats trailing?? i quite idiot to this one.... tot all are same?

I oso not sure. The 1st one leading the 2nd one trailing lor :p

ha ha ha

I think leading is the bottom plug and the trailing is the top plug... trailing fires 10 to 15 degrees after the leading plug fires... and I think it fires twice in the power stroke... waste something ... .....

wah beri chiem man :eek:
i thought spark plug is a breed of small dogs, kinda like miniature bulldogs :p

Aiyaa say until like that... coupe07 ask what is the difference so that's the difference I guess.... It's not like flying a plane.

:D :D :D

hey bro i'm just teasing la....
anyway ain't no rocket science to fly a plane :p

Taka explains rotary spark plugs
 

I think I would write something here.


Stock plug
The stock spark plug across the globe is iridium from NGK.

Leading and trailing
Now there are 2 sets of plugs: A set of 2 leading and a set of 2 trailing.

As someone said before... leading plugs fire first and receive most of the bangs. So their heat tolerance is higher - therefore, their heat rating is NGK 9 or equal to no. thirty something in Denso scale anyhow... :p

The trailing plugs are the 2nd set and it is not as hot. Stock is NGK 7 ...

Denso racing plugs has a higher heat rating. it is for more extreme condition like on the race track or rev the car a lot. The heat rating equals to NGK10 leading and NGK 9 trailing.

Type of sparks
There are tge racing type that we have stock and as shown above. There is a tip which is hte anode and hte surrounding catode (or something like that). It is different from old style spark which has a cross on it.

New re type plugs last longer and less misfire

When to change?
Whatever Mazda said - half it.

Most FD owner change their plugs 8000km max.

I enourage you to search spark plugs picture that most of us has done.

These are mine after 23000km
https://www.rx8club.com/australia-new-zealand-forum-37/taka%92s-spark-plugs-after-23500-km-65551/

Any more questions? I ran out of things to say :D

I plan to change them every 30k miles along with my plug wires....just not sure what im gonna run yet.

How often bros here change their plugs? and what plugs you change?

Changed mine to denso iridium at 15k...

I changed to the NGK racing plugs that are similar (or actually the same) as the Fujita Engineering is supplying.

I'm with Takahashi on plugs. 30K change.

Denso IRL01-31 IRT01-34 Cold plugs.

Don't bother with hot plugs. They'll "assist" marginally on consumption especially short city trips. But that's worthless in a high-revving car. :o

Which brings me to suggest one of those hypothetical bogus theories to go cold plugs and run on 95. Like I said, anyone can choose to discredit me freely on this, its just a hypothetical bogus theory. ;)