Do you find that your leading plugs are more fouled than trailing? I pulled mine out about 2 weeks ago and noticed that the leading were quite fouled and the trailing were normal. I'm wondering if my MSD has something to do with it.

 

I just installed a HI-6s on my 1990 N/A but I haven't changed my plugs yet. When I do I'll let you know

Bottle Jockey

 

I'm certainly not an expert but,

I believe that it is normal for the leading plugs to foul quicker that the trailing ones. The leading is the primary ignition spark and the trailings clean up behind.

I have been running an MSD 6A for about 6 months. I don't know if the box will help slow the fouling. I also put NGK EGVs in when I installed the MSD. The EGVs are actually motorcycle plugs specially designed to resist fouling. I could not be more pleased with them. At 2000 miles I check all 4 and just found the typical greyed carbon and no sign of fouling.

If you want to run the NGK EGVs you will need to mill a spark plug socket down so the walls are VERY thin in order to install them.


Mike

 

wow. EGV motorcycle plugs? you are a geniuos! is it a great improvement? no power loss... right?

 

Actually I heard about them on www.teamfc3s.org. site. If you search that site, and even this one, you can get some more info.

I have heard no one comment on power loss, in fact most say they can feel a gain. I did it at the same time as the MSD, so I don't really know what gain came from what!

Mike

 

I have the MSD 6AL installed on my front rotors. I have not noticed much of an increase in fouling. It is posible if your car is a little out of tune and/ or fuel mixture is not optimum.
I installed new plugs the day before I hooked up the MSD so that I could tell what the gains were. the MSD di a fanstasic job. I recomend it to any arotor head that can't afford the Jacobs Rotor Pac, which is next for me.

 

Other great plugs are the B7-ES (7 is the heat range, wich can go all the way up to 11s.) Just like the EGV, but with a normal spark plug electrode.

In my old PP, i use to run B10EGVs all the time. CJ

 

Mazdatrix sells a socket that will do the job, but it's $60! My 2 1/8" impact socket was only $45.

 

The leading plugs are supposed to foul quicker than the trailing. the leading has a much larger hole onto the combustion chamber. I have a Crane Hi-6, and I love it. I didnt really feel any power gains, but my gas mileage went up 3-4 mpg.

 

or,grind off the raised "rim" while the motor is out of the car...hehe.then,u can put any'ol plug in there ya like!