irridium spark plugs

SchaefSpider · Post by **SchaefSpider** » Thu May 24, 2012 3:22 pm

I was thinking about using irridium plugs. any reason why i shouldn't?

So Cal Mark · Post by **So Cal Mark** » Thu May 24, 2012 3:37 pm

thinking about them is okay, but installing them in your Spider is a bad idea

4uall · Post by **4uall** » Thu May 24, 2012 4:03 pm

many schools of thought on spark plugs however, from what i have read and seen here on the forum I agree with Mark. Here's what I used and they seem fine so far

Future Spark Plugs by itzebtze, on Flickr

SchaefSpider · Post by **SchaefSpider** » Thu May 24, 2012 4:20 pm

can you elaborate why its a bad idea? I'm trying to learn everything I can!

velozi · Post by **velozi** » Thu May 24, 2012 4:58 pm

I've always used regular NGK BPR5ES p/n:7734

Work fine for me.

4uall · Post by **4uall** » Thu May 24, 2012 6:19 pm

SchaefSpider wrote:can you elaborate why its a bad idea? I'm trying to learn everything I can!

here you go

http://forum.fiatspider.com/f08/viewtop ... gs#p132497

FulviaHF · Post by **FulviaHF** » Thu May 24, 2012 10:26 pm

4uall wrote:
SchaefSpider wrote:can you elaborate why its a bad idea? I'm trying to learn everything I can!
here you go

http://forum.fiatspider.com/f08/viewtop ... gs#p132497

In fact if you go to that thread, and then to the Guy Croft thread link in one of the posts, you'll find a design engineer for Champion recommending fine-wire iridium plugs.

4uall · Post by **4uall** » Thu May 24, 2012 11:20 pm

interesting

I say do what makes you happy. I find with spark plugs there is always the plug of the moment

I am only 41 however, since I started working on motorcycles and more recently cars there have been too many changes in the spark plug recommendation arena. Remember the V gap, then gold, platinum, iridium etc etc etc

I will never have the amount of knowledge needed to give professional advice on these cars however, I love this forum for being able to share ideas and experiences

best of luck

So Cal Mark · Post by **So Cal Mark** » Fri May 25, 2012 12:08 am

I'm basing my opinion on personal experience. I have found those plugs do not work well with the limitations of the Spider ignition system. And they're too damn expensive

maytag · Post by **maytag** » Fri May 25, 2012 12:08 am

So Cal Mark wrote:... And they're too damn expensive

Amen to that!

tartan18 · Post by **tartan18** » Fri May 25, 2012 1:18 am

If the engine has a conventional distributor I can see where a conventional copper spark plug would be the way to go. But what spark plug would be ideal if using the Computronix ignition system? Wouldn't this need a spark plug that is more "efficient?" Just asking ....

majicwrench · Post by **majicwrench** » Sat May 26, 2012 12:59 am

No expert here, but a spark plug needs to spark. The fancy materials just make it last longer.That said, things like heat range and gap matter, but I would bet if you objectively dyno tested an engine with various plugs the differences would me miniscule.
Keith

PS I'm fond of NGK V-gaps

FulviaHF · Post by **FulviaHF** » Sat May 26, 2012 6:22 pm

Iridium plugs have a very fine electrode, and they need the iridium for high heat resistance; with a less exotic metal the thin electrode would simply melt. And because of the fine electrode, gap simply doesn't matter. I run them in my Fulvia--conventional distributor with Pertonix module and matching coil--and I find they foul far less than the NGK D7EAs I used to run.

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