ER9EIX Plugs.....
 

I have a set of of BR9EIX and BR10EIX NGK plugs and when I was installing them yesterday I noticed that the 13/16" hex would be blocked by the raised edge on the hole before it was completely tightened so the socket came off before I could tighten the spark plug. It was all the way into the thread but I couldn't get it to where it actually compressed the washer fully.

And now for my question. The car is an RX-8 and the engine is in the car. Assuming I can't get to that area with a grinder because of space constraints to remove those little edges on the holes and removing the engine is not an option, what would be the problem with using double compression washers on each spark plug to help it stick out a bit? I only need about 1/16" more and it should be fine.

LMK if anyone has had experience with this.

Thanks.

Chris

When you use those plugs, you must either buy or make your own thin-walled spark plug socket.

You can make one by using a standard socket and very carefully grinding down the last 1/2 inch or so by slowly turning it while you hold it against a grinder.

Cheap - but it works.

B

Chris, yo tengo los mismos espares 10 en mi FD. Solo lleva la copa a cualquier machine shop y pide que le rebajen a un angulo (no recuerdo cuanto pero yo lo hice a ojo y quedo bien), yo fui a un machine shop en Añasco y lo hicieron como por $10. Si estas en PR dame un call.

Neit,

I am in Minnesota but I work at a medical device company....hoy me quedare despues q salga del trabajo y uso uno de los tornos...Gracias por el input.

Everyone else.

I am still curious about wether using double washers poses any problems.....just in case, does anyone know?

Thanks in advance.


Chris

It would affect the tip placement of the plug and would cause more misfires.
It may even affect heating of the area around the hole.

Just get the socket from Racing Beat or make one or use :

R6725-9 through R6725-115, Mazda racing, fine wire platinum center and ground electrodes, 14mm, 21.5 mm/.846" reach, 13/16" hex, recessed tip, resistor, $32,
.025" gap, the best for high power but idle may suffer, uses a normal socket.

I run these in my FD at .030" gap.

Thanks for the help. I ground the tip of a socket yesterday and was able to tighten the spark plugs.

The misfire ended up being a switched injector clip between one of my primaries and one of my secondaries(there is 6 total on the rx8 and they are all very close together)....nothing to do with the spark plugs but these are way better anyhow...
The car now reads almost a full point leaner across the entire rpm range which means they are burning one hell of a lot better. thanks to all who helped.

Chris

Hi, i got a set of BR10EIX from a friend of me and i would know if this are better and will be good for my 13B street port turbo. Any info will be helpfull....
Thanks.

What boost levels are you running?

I don't like these plugs because:
(1) there is no resistor
(2) theyre too short so may cause issues due to exposed threads in the boss area as mentioned before
(3) the ceramic section is much shorter than stock
(4) on a road-race FD that ran these almost exclusively (1 bar boost) upon teardown the rotor housings were completely shot due to the massive cracking around the spark plug area on the inner sealing surface

they are resistor plugs Goodfella, I've used them before.

But I quit using them because your're right on 2,3 and 4, and also there are reports of the tip breaking off due to not being able to withstand the rotary heat.

Just a little piece of info about NGK's part numbers,



If the second letter in the part number is a "R" then it is a resistor plug.



John

Thanks for the info.
I'm running about 15-20 psi. Thinking about going more than 20 later.

I'm running on pump fuel, and the problem i had is that it foul the leading plugs every time. At idle i sit between 13-13.5 afr and cruise 13.5-14 and in boost 11-11.5 afr. I'm using the stock plugs BUR7 and BUR9 . Yesterday i put BUR9 in all 4 spark plugs hole and it's like to be more resistand to foul, so that's why i think to put in the BR10EIX to see if it will be more resistand to foul. My compressor ratio is 90 psi on both rotor, street ported engine and dowelled, 850cc primaire and 1600 secondaire injectors, 40 psi on fuel regulator, 4ms dwell, i'm using boost cut at 15psi at the time and i use a stinger s2r ems.

^ What ignition system (coils) do you have?

90 psi compression isn't exactly a healty motor, and running those boost levels on 7s and 9s is asking for trouble.

I use 4 ls1 coil.

If the 7s and 9s is not a good option for this boost levels , what inexpensive type of plug can i use to not being asking for problem? hahaha
What is the best choice for my setup?

I'm new and learning about this. So any help and info is helpfull and welcome every time. I will appreciate it very much.