slacker

NGK BKR8EIX talked with NGK today ordered mine from NAPA 9.80 ea. said he WOULD not use BKR7E because of Electrode to fat not get complete burn said would work but not not recomened them for SuperCharged especially not after mods forgot Stk # 2668

balts2thewall

Do you mean the BKR7E from NGK?

slacker

Thats what I ment fixed it

balts2thewall

Why don't they fit?

balts2thewall

I just bought a set of 8 for $15, i haven't installed them yet though

slacker

They will fit but if you look at the elecrtrode it is the same size all the way down it will work just not as sufficient at burning all the gas it is the type core took mine out before I ran thought I would call NGK

cashstacker

I havn't had problems with mine so I'm keeping them...

Matty

I have the BKR7EIX's and they are running fine.

Jekyl

i am having no troubles with my stock plugs....


so why is everyone switching out plugs?

Matty

Rule of thumb is an increase in power dictates a colder plug. Although the increase is small by performance standards, most are going to the colder plug. I am in belief that the stock plugs are fine at this level but I switched anyway.

STi_WRX02

You don't HAVE to change ur plugs if ur not having problems with em. But ppl usually change em out when u add power mods and stuff. Besides...there's nothing wrong with changing out plugs...Most ppl say that for every 50-75HP u add to the car u should go ONE step colder. That's the usual rule of thumb but you can go two step colder but that's not necessary unless ur pushing a lot more power.

Toyotech

exactly, i have always went with 1 after a 50hp increase...for the jump to second step down would be more, and for anything passed one i would only run copper where i would swap out every 10k and check/regap every oil change

fljohnboy

From the NGK site:

Q: Are special plugs always necessary on a modified engine?

A: It depends on the modifications. The term "modified" refers to those engines that have received bolt-on improvements that may or may not raise the engine's total compression ratio. These can include turbocharging, supercharging, nitrous oxide injection, the use of smaller-chambered cylinder heads, modified piston configurations, free-flowing cylinder heads, change of induction components and/or the use of different fuel types and octane. These kinds of modifications generally require a change from stock spark plugs.

Modifications that will typically not require specialized plugs (in most cases the factory installed plug will be more than adequate) include adding a free-flowing air filter, headers, mufflers and rear-end gears. Basically, any modification that does not alter the overall compression ratio will not usually necessitate changing plug types or heat ranges. Such minor modifications will not significantly increase the amount of heat in the combustion chamber, hence, a plug change is probably not warranted.

However, when compression is raised, along with the added power comes added heat. Since spark plugs must remove heat and a modified engine makes more heat, the spark plug must remove more heat. A colder heat range spark plug must be selected and plug gaps should be adjusted smaller to ensure proper ignitability in this denser air/fuel mixture.

Typically, for every 75-100 hp you add, you should go one step colder on the spark plug's heat range. A hotter heat range is not usually recommended except when severe oil or fuel fouling is occurring.

1stbluSS

I changed plugs for a few reasons.

1. iridium plugs are not the most efficient for S/C's. Iridiums are meant to last for a long time but not neccesarily for S/C's
2. My idle was a little weird so I figured lets try some new plugs. Idle's awesome now gapped at .040
3. I have a smaller puller, intake, bpv mod. Wanted a cooler " burn " so to speak.
4. They were $7 so why the hell not.

slacker

My stock plugs are still in runs fine. BUt as I get knock retard because of advanced timing and boost could make diffrence in detonation. As I said earler they will work just not as efficient.

1stbluSS

write up on polishing the blower would be nice.. not so sure I want to do it as I fear rust but what the hell.

slacker

It,s cast Aluminum can't rust can dull if not keep clean
Inglis Dampner is Stainless Steal depending on grade shouldn't rust have benn polishing bike parts for awhile

nduchene

This pic may help things a little. I pulled this from the RL forums - these came out of an LSJ (I think he was only sticker modded at the time , maybe I/H/E)

Left plug - stock
Middle plug - BKR7E
Right plug - BKR7EIX

The stock plug looks the best out of the 3.

Hope this helps

heather-12

what about the bkr7eix-11. supposed to be colder. these gonna work still gapped at 35.

Never mind...i'm tracking now. I got the iridiums. needed just the regular 7e copperplug!!