Brettus

iTrader: (2)

hmmmmmm ......I think you should .

9krpmrx8

iTrader: (46)

Why is that?

Brettus

iTrader: (2)

Because the plug is recessed into the hole a long way , spark will be less effective plus there will be a small loss in compression .

To what degree this affects anything ............... I have no Idea . But it's the right way to do it & I thought you like doing things the right way 9k ?


What's the word you used recently ........................... "half assed " ................. yes that was it

9krpmrx8

iTrader: (46)

I don't follow what you are getting at, how would a stock (RX-8) RE9 be any more recessed than a stock (RX-8) RE7?

Brettus

iTrader: (2)

The stock trailing 9s have a shorter reach than the leading 7s

9krpmrx8

iTrader: (46)

I will have to set them side by side when I get home but at first glance they look like the same length. If there is a difference I would guess it's very minimal and on the trailing I highly doubt it matters. And they last a **** ton longer than the FD plugs. But I will take a look when I get home.

Brettus

iTrader: (2)

I agree that they should be a good choice .............. but also think they should be set to the correct length .
The only reason the rest of us haven't done the same thing is because of the hassle of machining the plug .


Also : you may have problems tightening them once they are machined as the hex will be further in .

9krpmrx8

iTrader: (46)

I don't see how that slight of a difference in length would matter at all. This setup has been running fine for over a year. But I am curious to actually measure them when I get home.

9krpmrx8

iTrader: (46)

I do have a pic of the FD BUR9 plug versus the RX8 RE9 plug though. I just think it moves the electrode too close. Don't mind the middle finger, I took this pic for someone else,

(disclaimer: this is the old RX-8 plug style)

Brettus

iTrader: (2)

It's maybe 2-3mm.

I'm not sure if it does or doesn't make a difference...... but It's not something i would do .

yomomspimp06

while i hate to rely on old school logic with the renesis, the 7 guys have been doing this for quite some time....

9krpmrx8

iTrader: (46)

The longer FD puts the electrode closer on a few mm but I don't know if that is necessarily and advantage or not. This is a pic of a BUR9 FD lug in all the way hand tight a RX8 Trailing RE9B in all the way hand tight in the leading position. The RX-8 stock RE7C leading is supposed to be slightly longer than the stock RX-8 RE9B but I can't find a damn RE7C in my garage.

These are just hand tight.

BUR9EQP FD trailing Plug in the leading position.


RE9B RX-8 trailing plug in the leading position.

TeamRX8

iTrader: (25)

The RX8 leading plug is longer than the trailing by design

There are colder plugs in RX8 leading length available, but they cost $$$

Last year I lucked into about a dozen NGK Iridium RX8 #9 leading race plugs for $18 each shipped, they usually cost $55+ each ....

kma5783

iTrader: (7)

That's what I'm running in my car...
NGK (3795) R7440A-9L

IIRC I bought them for around $20 per plug off Amazon, but it was last year too.

9krpmrx8

iTrader: (46)

$63.00 a plug. Get some. Gotta pay to play. Thanks for the info.

Carbon8

iTrader: (4)

I dont follow the benefit, I can understand using the leading plugs in place of trailing to maximize efficiency. What would switching to a R7440A-9L over a RE9B-L.

9krpmrx8

iTrader: (46)

Well for boosted applications you want a colder plug, so you just want a colder plug than a 7.

Carbon8

iTrader: (4)

Thought the OE plugs were rated at 10 , and Team is NA. I understand FI applications more curious why he uses them. From what I have heard they are more susceptible to misfires over time.

9krpmrx8

iTrader: (46)

OE plugs are 7 leading and 9 trailing.

Brettus

iTrader: (2)

Because ....race car .

Brettus

iTrader: (2)

Also to throw into the debate ..... The plugs with an electrode ... it has been said that the electrodes do break off sometimes in extreme applications ..... I have nothing to back that up with myself ....Just throwing it out there .

9krpmrx8

iTrader: (46)

Yeah that is the reason Steve Kan recommended I not run FD plugs, he said that it puts the electrode too close to the action (not his exact words). But you know what they say about opinions.

Brettus

iTrader: (2)

The FD plugs (BUR9EQPs) don't have an electrode (that can break off) , which is another reason why we like to use them .

TeamRX8

iTrader: (25)

An NA road race rotary engine will typically run a 10.5 - 11 heat range

For autox we have more idling and also we don't have 20+ minute WOT excursions so I run a 9L/9T or 10T range to keep fouling at a minimum.

The electrode doesn't break, it might come off because of some other poorly thought out ideas being used though .... that's the side of the story some people never hear or figure out ....


.

9krpmrx8

iTrader: (46)

All but one of the Stage 8 fasteners work on the turbo. 3 should be good enough with a normal nuts and lock washer on the 4th. But I can grind some to get the lock washer deal to slip on. They will not work on the downpipe except for on two of the studs but the downpipe ones don't tend to work lose.