Got a set of Trailing and leading Spark Plugs off Mazsport this week.
http://www.mazsport.net/store/index....duct_list&c=12

When I opened the box I was like ok this dont look right.
Last time I changed my plugs I got them from Mazda and the box's the spark plugs came in where white and had blue printing on the box's and told you where to install them on the Car.
These dont tell you where to install them on your car and the box's are yellow and have NGK in red
The tips of these spark plugs are also different from the ones I got at Mazda. These are cut with a X the spark plugs I got at Mazda had what looked like spikes facing the center of the plugs and thats what the ones I took out of the car looked like. Not like this.
These also have rings on them and have two rings on the Trailing plugs
Take a look at the pics and tell me what you think,


Well I know I can use them cus they screw right in like the OEM ones, but should I use them?
Are they a direct replacement for my OEM plugs? and will I have any problems with them?

Thanks,
-Gil

 

Those are RX-7 plugs.
Most of us use them these days, if for no other reason than they are cheap ($4 - $7 a plug at NAPA).
The trailing need shims because they are too long for the Renesis.
Just remember to cut the wire tie off first!

 

Ahhh F**K me, I could have went to AutoZone and got them for dirt cheep
Thanks Jeff...

 

How long do you think they will last VS the OEM ones?

 

Depends on how you drive.
If you don't foul them, they will go for a long time.
That said, I change mine 2 or 3 times a year at least.

 

Dam it they are not going to last. I drive it like I stole it lol well guess they will do for now till I get a OEM set

 

If you drive it like you stole it, the plugs will last for a long time.

 

Yeah but I have to redline (Freeway redline) her everyday to clean out the carb build up lol

 

Hi guys
i wanna get rx7 spark plugs and put in my 8
but i heard they re bigger so
How much longer r they?
what can i use as a spacer?
Thanks

 

how about search or just read this thread more carefully ?

 

The same exact thing happened to me. Mazsport's ebay site is very misleading. I had purchased two trailing "OEM" as advertised, but instead got these rx7. I emailed with a complaint, and all I got was someone saying that I don't know anything about rotaries and that they fit correctly blah blah blah.

That was not what I had complained about...

I was complaining about the false/misleading/insufficient advertising of the plugs...wow

 

I would not use RX 7 plugs.

The performance is not there and they will foul unless you have a FI car.

 

Oh reary !
guess those other 8's in my rear view mirror were a mirage ........

 

i am sooo confused on this too...not only that can we use both leading and trailing from the rx7 on the 8?

 

dozer: some FI guys use RX-7 plugs. Not really needed for an NA 8

 

so then just forget about it...

 

plus they're cheap. See MM's response (post #2)

 

go to www.sparplugs.com

about $ 95 with shipping the Stealership wants anywhere from $170 to over $200

 

I fixed your link, I'm assuming "sparplugs" was not the site you intended

 

I use them for my turbo'd 8. You need all trailing ones if you are FI.

 

I've used the RX7 plugs... but don't expect to get more than 15K miles out of them.
I started getting misfires and ended up just installing new OEM NGK (RX8) plugs.

 

you get what you pay for...right?

 

Absolutely!

 

they can be used but they are not quite there for top performance on a na car. who have to use 2 washers on the trailing plug so the tip of the plug doesnt bottom out and on the lead plugs use no washers. AND when you do that you have to retighten them from time to time as they will vibrate loose!
OD

 

^Absolutely!
And the two trailing plugs SHOULD come with the washers if purchased through MazSport... but its always good to verify!