h2ojoshua

hey im putting these on my rx7 do i need to gap them and if so how much? I have a single turbo on 10psi? Help please.

Mahjik

iTrader: (1)

Is the gap adjustable on the plugs? If so, measure them to see if they are .025". If they aren't set them to .025".

h2ojoshua

yeah you can gap them. they are right around that now. thank you.

TimeMachine

iTrader: (10)

Ugh....

FSM, Engine Specifications:

.044-.066in (1.1-1.7mm)

Mahjik

iTrader: (1)

From Mr. Kan:

https://www.rx7club.com/showpost.php...44&postcount=4

GoodfellaFD3S

iTrader: (213)

Kyle, the OP is asking about the RX-8 oem plugs if I'm not mistaken. The link you posted refers to the NGK race plugs.... that info is correct for the 6725s but may not be for the RE9B-Ts.

Mahjik

iTrader: (1)

The gap should be car specific (for the most part), not plug specific. i.e. if the plug should only use the same gap, why make it gappable?

GoodfellaFD3S

iTrader: (213)

Different plug designs, different electrode thicknesses, etc.

If Timemachine is quoting the mazda FSM gap for the oem RX-8 plugs, then it's about double the gap for the NGK race plugs.

TimeMachine

iTrader: (10)

Ooooh... No, was quoting FSM for FD RX-7.

OP, get BUR9EQPs - $6 a piece.... bada bing, bada boom.

Mahjik

iTrader: (1)

I've never seen the gap spec change for the same vehicle just because of the plugs. Not saying it's not correct, but typically the gap is vehicle (application) specific regardless of the brand of plug.

GoodfellaFD3S

iTrader: (213)

You mean the oem FD NGK plugs that don't need to be gapped?

Kyle, I know what you mean. Being that the majority of rotary plugs don't need to be gapped, it can be a bit of an odd subject.

Add to that the japanese NGK 7420s, which are technically gappable but due to the design you can't use a standard plug gapper to get an accurate gap. Quite the PITAzz

neit_jnf

iTrader: (17)

I just gapped the old rx-8 9's I had to .030, then using a small flat head screwdriver I measured how far it would go into the gap then used the screwdriver to gap the 7420's to the same.

Turblown

iTrader: (12)

Going to be a downgrade using the Rx- 8 plugs, they have less reach. @ 10psi you should just be running 4 x stock FD T plugs( ngk bur9EQ)

GoodfellaFD3S

iTrader: (213)

I ended up doing something similar. Still a pain, lol.

Agreed

BoostCrzy

I decided to give the RE9B-T's a try on my FD.....so far so good....stock ignition system otherwise....

TSXtasy

this is correct, gap is vehicle specific. I sell plugs on a daily basis and haven't seen different gaps specs for a given vehicle.