Evo 9 Spark Plug List, Also how to read plugs.
what spark plugs should i run in my evo 9 with my mods? i have meth injection 50 /50 intake tbe boosted to 29.5psi intercooler full pipeing, works bov ? tuned by english what plugs would you recomend i was looking at the br8eix would thos work? i read something about some plugs not working for the 9? and what should i gap to thanks
We use NGK LFR6A-11. Gap to .022.
They are copper plugs.
Affordable and work great at $25 a set.
EDIT: Found this post (https://www.evolutionm.net/forums/4367038-post22.html)
Well after reading all the stuff on NGK's website about spark plugs I think I am starting to figure this stuff out. sparkplugs.com only lists the following copper plugs that have the same dimensions as stock. the 5 or 6 seen here indicates the heat range (stock is 7). These plugs are hotter then stock and not what you want. One range colder than stock would be LFR8
LFR6A-11
LFR5A-11
LFR6C-11
The A or the C seen after the LFR6 indicates the type of tip design. I could not find much more info then (A-C) indicates special tip design, perhaps one is a V groove and another is not.
The -11 indicates the gapping.
ultimately I think I am looking for LFR8A, LFR8B, or LFR8C....I don’t really know which, the gapping they come with does not really matter.
Again these are copper plugs, not iridium like stock. I am looking for a cheap plug that can be used when I start playing around with meth and COP ignition.
LFR6A-11
LFR5A-11
LFR6C-11
The A or the C seen after the LFR6 indicates the type of tip design. I could not find much more info then (A-C) indicates special tip design, perhaps one is a V groove and another is not.
The -11 indicates the gapping.
ultimately I think I am looking for LFR8A, LFR8B, or LFR8C....I don’t really know which, the gapping they come with does not really matter.
Again these are copper plugs, not iridium like stock. I am looking for a cheap plug that can be used when I start playing around with meth and COP ignition.
Last edited by silex; May 21, 2009 at 11:55 AM.
Ive always heard that copper is the best for performance but the whole iridium thing with smaller wire etc makes me wonder on the dyno if there would be any differance on the IX with the copper versus the iridium or is the cheaper cost the only point?
I just bought a set of the Brisk Silver plugs ( The guysa at Perrin said they work and a lot of them use them in their cars) silver is a better conductor than copper or iridium and my thought is it might transfer more voltage and keep me from having to buy Ignition upgrade. To maybe prove the spark is stronger I gapped plugs wider than iridium and so far the silver plug can spark at a gap where the irdium plug would blow out. To me so far this means that is true the better conductivity of silver allows a larger plug gap due to larger spark.
To that end the Denso IKH24 I removed ran awesome at 30psi for some 8-10k miles.
Denso has the patent and makes the smallest electrode .4mm the smaller electrode wastes less voltage in the metal itself and therefore makes a larger spark so Denso claims. The Denso's aren't quite as durable as the NGK but if they are not subjected to abuse maybe just as good if not better than the NGK's IMO
