i want to know if its true that people use the four aparks 9's..if its real why more hotter plugs??i want to know because im gonna replace my plugs soon
thanks

 

I use 9's for all four. Recommended to me by Mazda Motorsports. The 9's are cooler plugs than the two 7's that they replace.

 

adam c = thanks a lot . i will buy it today and raplace it they are really bad and is making backfire im sure are saprk plugs.not new to mee.

 

If you drive your car in town and on the freeway almost exclusively don't install the 9s all the way around you'll lose power because they'll foul due to running to cold. The 9s do make cold start slightly rougher also.

If you do a lot of track events, etc then run the 9s.

 

I would recomend running all 9's all the time. Mazda put the 7's in only for emissions reasons, they are not good for the car. Using 7's is sort of like saying that the precat is good for your car.

9's all the way around should last you about 10,000 miles depending on how rich you run.

 

I agree, had the damn problem all the time with running 9's. Went' back to 7's and 9's and no problem

 

My suggestion is if you have an aftermarket ecu, then run 9's all around. Otherwise, 7's and 9's are sufficient.

 

I've ran all 9s for 2 sets now and haven't notice any loss of power. I agree that start up sometimes will be a little rougher (If you park inside a closed garage it's more smoother during startup) but I ain't trippin over something small like that.


-Dan

 

Sorry for the ignorant post folks, but I haven't put enough miles on my engine just yet to have had to replace my plugs. How tough is it to replace them, and what sort of time committment is required?

What brand plugs do you use? Cost?

 

I like the NGK's.

 

It takes about 5 minutes to change the spark plugs, they are pretty cheap too.

 

i run 10.5's all around and no problems.....i just clean them often....

 

What, if anything, is there to R&R for changing the plugs? Socket size? Any other considerations?

P

 

wow, 5mins? i changed mine yesterday but took about 15mins (from the bottom). haha ill try to do it faster next time.

btw, anyone knows which store has the lowest prices on plugs?

 

Discount auto parts has them here in orlando for 4.99 for regular ngk, and 6.99 for platinum.

 

Impressive 5 min for plugs change (even 15 min)...I must get my act toguether...more like 30 min for all 4 (from the top though) for me..

 

I used to use 7's and 9's, but I have recently changed to 9's all around. Noticed that the small amount of ignition breakup I had went away (of course, that could just be due to the fact that the old 7's were pretty fouled).

I have noticed ZERO starting problems (starts just as easy as it did before). Runs perfectly fine even when cold. Only been running 9's for about 2000 miles, but they have not yet fouled out.


I never understood why people change plugs from the bottom. Takes me an absolute maximum of 5-10 minutes to change them from the top. Just need to pull off the elbow, and then the plugs are right there... Seems to me that jacking the car up to get them from the bottom would take more time...

Rob

 

www.robrobinette.com

 

working from the bottom works for me because i usually change my plugs when i do oil change.

btw, 15 min for just changing plugs, not including jacking up the car, putting stands, etc

 

Why pull the elbow? Just pull the plugs, they're perfectly accessible with the elbow on.

 

5 minutes? That's pretty fast man.

Patrick, I can show you how to do it, it's easy. Having the right sockets and extensions helps bigtime.

 

Since it's so easy, apparently, I might just replace my current plugs with 7's and 9's, and then put a fresh set of gapped 9's in before track time, since when I drive on the street it's generally pretty mellow.

Patrick

 

I'm running 9s on all 4. No problems at all. You shouldn't have a problem running them on the street.

 

breakup where? i have breakup near redline sometimes, will 9's all around have any effect on this? good/bad

 

Your problem is that you sold your HKS Twin Power Amp!