so i was reading on spark plugs for the 7 and i saw that i should use a different spark plug for T and a diff one for L. that if u didnt have this done your 7 wouldnt run correctly. i didnt see what the reason for this was and was just wondering wat the difference in spark plugs was for. im still trying to understand the rotary.
thnx

 

L is for leading while T is for trailling. The trailling plug just fires an aditionnal time during combustion.

http://www.rotaryengineillustrated.c...-ignition.html

 

AZDK thank you for not being a *****. i just want to understand rotary more. i like to know how this stuff works and YES i do know they are different! READ MY POST! i wanted to know why they are different and wat purpose this serves. once again thank u azdk.

 

bro i bet you got **** for this... well my understanding is that the leading plug fires first and to create the initial flame front that pushes the rotor and the trailing was to reduce emissions by burning off the rest of the fuel in the chamber. hope that made sense.

 

The trailing plugs are a colder plug. That is the only difference in the plug itself.

The trailing plug hole is much smaller then the leading to minimize combustion gas crossover into the compression stroke as the apex seal sweeps past.

The trailing ignition fires about 10 degrees after the leading (in most cases) to continue combustion and cleanup any leftover fuel.

The car will run fine without trailings or with the wrong plugs installed for trailing, but that doesn't mean you should do either one.

 

Be careful if you use the Haynes Manual. They reversed the trailing/leading locations for installation. Always remember, leading on the bottom.

 

Leading Lower
Trailing Top

 

thnx aaron cake

 

That is what Mazda recommends.

No.


-Ted

 

Wrong, the leading is fired twice per cycle, due to the wasted spark set-up.

 

Can anyone verify if this is true for any version of the Haynes manual?

 

there was a thread on it a couple of weeks ago... maybe last week even

 

Here ya go, https://www.rx7club.com/2nd-generation-specific-1986-1992-17/haynes-repair-manual-wrong-731161/

 

I could have sworn that the leading (BUR7EQ) was a hotter plug than the trailing (BUR9EQ) plug. I know when you up the boost you need to run colder plugs and usually for most street applications simply running all BUR9EQ's gets the job done.

Someone can feel free to confirm.

 

well before i read about it i went to the store and got myself some new ngk plugs. didnt realize that he had given me all traling plugs. car wasnt reving up properly. so i came on here and found out about the whole t and l plugs being diff and now that they are all in right the car runs find and revs. up smooth as ever

 

You must know that if I'm wasting time on this forum I am drunk. lol.

For some reason I always confuse leading and trailling which is why I always double check them.

 

Are you sure it was just a matter of needing both Leading and Trailing plugs? It seems some people just run Trailing all around and their cars run fine. I always figured the difference in Leading and Trailing was mostly for a better/more efficient combustion, since I once had all my Leading and Trailing plugs reversed and my car still drove fine.

 

You are correct.
Aaron Cake must've slipped some fingers on his typing.

High the # -> colder the spark plug range


-Ted

 

You are right. I screwed up when I made the post. I've since edited and corrected the misinformation.

 

No worries... we all make mistakes. Plus I wanted to make sure I wasn't going nuts!!! lol

 

Incedently, I have 2 copies. both pictured in the thumbs below. Neither of my copies have the mis-print. One was purchaced in 2002(3-D x-ray type cover,IBSN 1 56392 007 7), the other in 2007(actual photo cover,IBSN 1 56392 007 7 /799-1169). I PM'ed the guy with the defective copy to get his #'s. So its definitely not all of them.

 

The manual in the pic on the left is mine and that one has them wrong, I never got a PM. But the number on mine is ISBN 1 56392 007 7 also. So I guess you can't go by that number, the number on the top right corner of my cover is 61036 (1419)

edit: I just got his PM

 

So, its all the 2X6's. 1st page above the APAA.
7Z8's, and the 2C9's are fine.

 

It could be more than just that, I don't know how many others are wrong.

 

Maybe more will come forward. You should start a #'s request thread somewhere.