LBrown8

What is the true tourque for your spark plugs
I have discuss this with other 8 owners,
Mazda says to tighten by hand untill you feel resistance and a half turn and the plug will be tourqed,
others say to tighten by socket until plug will not turn anymore (im sure this will work out to be an crazy amount of FPT,
and others say you tighten by hand a make a two full rotation,

What is the CORRECT tourque in your opinion?

9krpmrx8

iTrader: (46)

Tighten by hand until tight.

LBrown8

I was going to ask where the OBII plug was as well.



this is sarcasim, found a funny thread while searching

EDZRIDE

iTrader: (1)

According to the manual 114-156 inch/pounds.

SPARK PLUG REMOVAL/INSTALLATION

ken-x8

I don't recall offhand whether the half turn is the right value for our plugs, but that kind of spec applies to a new crush washer. If you're putting a used plug back in and using the same washer, that won't get you there. Use a torque spec, like Edzride says.

If you have a car that uses tapered seat plugs without a washer, then "hand tight plus 1/8 (or whatever) turn more" always works.

Ken

deadphoenix52

gütentight

nycgps

iTrader: (1)

hand tighten until it stops, then use your ratchet to give it another 1/4 turn. done.

before install, ALWAYS apply Anti-seize to the threads.

ken-x8

I'm with you 100% on that. But just to give the OCD crowd some angst, NGK says to not use anti-sieze.

Ken

nycgps

iTrader: (1)

cuz they are afraid it might effect the grounding point of the spark plug aka the threads

honestly, most if not all anti-seize are electricity conductive. even if it does add a few ohm of resistance. I still will use it, cuz it's better to have less performance than a seized-up spark plug

HiFlite999

iTrader: (2)

^ note that increased electrical resistance also means reduced heat transfer. A loose or over gooped spark plug will run hotter than it should, which may, if it goes far enough, cause pre-ignition.

nycgps

iTrader: (1)

but honestly, how much are we losing? I would say it's probably negligible and not going to cause any "reduced heat transfer"

and again, would u rather have reduced heat transfer or a dead stuck spark plug ... I take reduced heat transfer.

next time when I do my plugs (or doing it for other members) I'm gonna use a torque wrench and check how much torque am I putting to the spark plugs.

olddragger

iTrader: (3)

heres a new thought--maybe while we are focused on sparkplug TQ ( how did this get started anyway
what about indexing the plugs? Who thinks that there may be some value in doing that?.

nycgps

iTrader: (1)

I left mine at stock, but if u are racing (autoxing, whatever), then It might be a better idea to do that.

or just use Denso plugs