I put some NGK iridium plugs in my Diablo a few weeks ago, seems to have made a pretty significant improvement. I now have ordered iridium plugs for my TR and Lotus. Hope to have the same results. Do these plugs really do as they say? Or is it just a placebo? Comments.....................
IME on a carbed car, NGK V (Paladium), VX (Platinum), and IX (Iridium) work wonders -- greatly extending the fouling interval compared to the NGK S (standard electrode). On later cars, with better fuel delivery systems (assuming that they are working correctly) and "hotter" ignitions, maybe not so critical (except for extending the wear out life), but certainly don't hurt (I use them in my TR). The trick is to get them at a reasonable price
Go here http://www.sparkplugs.com/ And fill out the info, it tells you a few levels of plugs in dif price ranges.
Try this for size..... http://ngksparkplugs.com/tech_support/spark_plugs/index.asp Read all 5 pages, reasons like high octane fuel (100+), higher revs, amb. temp. are the reasons I bumped my plugs from 7 to 8.
Iridium is definitly worth it. I have them in my Daytona and C4 as well as various motorcycles. Sparkplug.com application chart is very comprehensive and accurate; I measured reach before installing and it is right on. The vehicles ( especially the MCs) are noticably easier to start.
From what I understand is the iridium plugs fire as powerful or more powerful than a standard plug at lower voltage, they produce gobs more spark both at idle and high rpm.
$6.99 each, local pep boys, same for my 84 QV, going to attempt to do this myself this weekend (or next weekend with friends if I get stuck in the middle of doing this and dont know how to finish it). James in Denver
a question gentleman, i have been running and recommending NGK BP6 plugs as a "hot" plug on the carb cars for some time. (the NGK BP5, was a bit too hot of a heat range.) these were the "normal" plugs, not platinum or iridium. do you go DOWN a heat range with iridium to a "7" from a "6" ? or can the car cars safely use a "6" iridium? i never did try these "super plugs". when i move on to the next car i will give them a try. the Pantera is for sale and i have had that Ferrari itch again for weeks.
Yes, you shouldn't have any problem using NGK BPR6EIX if you are using BP6ES (or BPR6ES) now. The better anti-fouling characteristics of the IX (Iridium) might make it a little more unnecessary to drop from the stock 7 heat range to the hotter 6 to prevent fouling, but unless you are hitting triple-digit speeds for extended periods you should be fine with the 6 for rational US street use.
just thinking about all the sets of BP6's i installed, and 1 set if Iridiums may have been the better choice for a carb car. i have not seen anything i want to buy on the market as of yet.
