For the past aprox. 8 months I have been running all BUR9EQ's in both the leading and trailing positions in my n/a. I haven't noticed any noticable performance increase.One thing I did notice is the other day when my car flooded so bad https://www.rx7club.com/2nd-generation-specific-1986-1992-17/finally-happened-me-flooding-381423/ and I had my leading plugs out to clean them it didn't look like they were wore very much.I had expected the to look worse based on what the 7's usually look like when I change them.So though there is no performance gain they may last longer. I drive mostly backroads and highway though.They may not be suitable for alot of city driving due to them being two heat ranges colder than the standard leading plugs.Just alittle info on my results since this comes up every now and then.

 

There will never be a performance gain from adding a particular sort of spark plug. The only performance isn't from the plug itself, but from the amount of boost you throw at your engine. More air into the engine means a much more sensitive combustion. Plugs that remain to hot will pre-ignite the mixture causing detonation. Spark plugs themselves do not give you any more powerfull spark than stock ones either for really high boost applications, you need a seperate device and performance wires to get a better more powerfull spark.


Basically what im trying to say is that for an NA, there will never be any kind of performance increases that you can adjust by getting 'better' spark plugs.

 

Never say never! ;D

--Gary

 

Hmm yes, I should never put into account for the future. Who knows, maybe one day we'll buy sparkplugs that inject nos into the engine or somethin, lol.

 

I'm just curious, but what level of performance increases on an NA do you think would be necessary to need better spark plugs? Either by HP or 1/4 mile time. Just wondering what you think, not trying to be sarcastic or rude or anything.

 

I would think none?

I always thought that the need for plugs that stay colder is only beneficial for boosted engines that want to avoid detonation.

But then again im not an expert, so maybe I should just shut my big fat mouth

 

I really didn't expect any gain. I just did it as an experiment to get my own results, that and my leading plugs were worn and my trailings were still good and I had some like new trailing plugs laying around. So I stuck them in 'cause I was too cheap to go buy new leading plugs.Since I noticed no difference I left them in.

 

I dunno, just wondering. I've read some things where people thing after some porting you might want to run some better plugs.

 

I dunno, I think that you may want to run some sort of aftermarket ignition system if your porting. More air means more resistance on ported na engines, so you wanna boost the spark to get a good combustion. right?

factory plugs im sure would be fine for this.

 

I beleive I read that engines that run or stay in the high rpms most of the time as in a race car benefit from a colder plug due to not having much time to "cool off" between combustion cycles so too hot a plug could cause misfires or pre ignition as in a boosted engine. But we are talking street cars so that probably doesn't apply here.

 

thats exactly what I said above. I don't think the AF is sensitive enoughe in a ported NA engine to cause pre-ignition with a hot plug tho. I think the only thing you need in that situation is a aftermarket ignition system.