First time I've ever heard of this. What's the advantages then? It seems like Mazda and NGK wouldn't have bothered using surface gap plugs unless there was a damn good reason.

Its probably because the plugs are recessed in the chamber, and it may light off leaner mixtures a little easier. I never did back to back comparisons after I went with a standalone. And the difference I noticed before was likely due to my heat range requirements being drastically different than stock. It was basically a race engine, and I was melting the electrodes off stock plugs. I went with 11's all around, and they worked perfectly, and I never had an issue with fouling.



I seriously doubt you could measure a difference on any dyno, and Id be suprised if any real world test would show any meaningful difference. I think any differences are purely theoretical, or at most only significant in laboratory conditions.

I lifted this from the Racing Beat catalogue:



Racing - Street-ported Engine



Racing Beat recommends NGK Spark Plugs for stock or high performance rotary engine applications. The BR10EIX spark plug is recommended for street-ported, racing rotary engine applications. Price shown is for one (1) plug.



Specifications: NGK BR10EIX



B= 14mm Thread Diameter

R= Resistor Type Plug

10= Heat Rating *

E= 19mm Thread reach

IX= Iridium - Offer simproved ignitability and durability than platinum.





This is not a spark plug recommended for the RX7 by NGK. I assume because it is a single electrode type. I conclude that one may run a spark plug such as this in my car.



So the question still remains, how do I figure out which of these Pulstars will work in my car. After I try it, I'll let you know if it's a gimmick, if it blew up my engine or if it truly works.

I'd say just call pulstar and ask if they have a plug with the same heat range, thread diameter and thread reach as the RB recommended ones. It says on their site that they do have multiple heat ratings for certain plugs, so it may just be a matter of asking someone. They don't seem to have much in the way of a code system so you can just ask for a certain plug model, but I'm sure they have access to plugs of the same dimensions.

I dont understand why you are so worried about it stick with the stock plugs if you have a stock engine, you have to change them so often you dont want to buy anything to dang expensive.

I'm curious. Maybe they're better. Besides, I'm a lawyer.

okay so just because you are a lawyer means what? IF you have money to blow spend it on other stuff.... not on plugs that wont do ****..

whats the worse that could happen- you could always sue them.





for real though- if I was a lawyer the last thing I would be dicking with is spark plugs in a 1989 car

Didn't say he was a good lawyer...

As a lawyer, I'm interested in finding out the answers to questions that other people are afraid to address in a practical way. Issues that haven't been dealt with before are the most interesting, regardless of the cost.