vha27

ok so i was told that these are great for turbo hondas, and i plan on slappin on my turbo prob next week on my d16y8, the thing is i have denso iridiums (bout 15000 miles on em), heat range is a 16 which equates to a heat range for denso of 5.33, ngk heat range times 3 equals denso heat range, so the BCPR7ES-11 is a 7 meaning it would be a 21 for denso, now is there ne disadvantage to running these really cold plugs, ive also read about denso not being able to withstand detonation, and destroying the whole motor cuz the electrode broke off, not that i plan to detonate or nething but just in case, i wanna be safe than sorry

does ne one have ne hard facts about my question, opinions are good too


thanks,
chris

sharkcohen

That plug is fine. I run that plug in my boosted H22, works great. Heat range of 7 is what you want for boost.


[Modified by sharkcohen, 2:12 AM 2/5/2003]

fsp31

>>Ngk BCPR7ES-11 <<

You've got the right plugs. FYI if you didn't already know... "Colder" plugs help prevent detonation by having a shorter electrode which doesn't extend into the combustion chamber quite as far as "hotter" plugs. The small amount of extra time it takes the fuel mixture to contact the spark can save your motor.

TREVER

you may not plan on detonating, but a plug with a heat range of 5 is. Use at least 7's

mos

Its not the electrode itself that differs in length, it is the insulator. Colder plugs have less insulation, and therefore they let the electrode cool off more quickly than a hotter plug would.

fsp31

>>Its not the electrode itself that differs in length, it is the insulator<<

Hold a "5" up next to a "7" paying close attention to the portion that extends into the combustion chamber. The "7" is shorter. I was not aware that the insulation was different, but the amount of plug extending into the combustion chamber is also a key factor.

vha27

woah, ic, the higher the number on ngk's the cooler the plug, thought it was the other way around, muh bad, figured a 5 would be cooler than a 7, doh!! ok thanks a lot guys

mos

Sorry to ressurect this post, but I'm trying to learn. I think you are wrong.

If you are right, hotter plugs have a higher chance of contact with the piston, which is a bad thing. That does not compute.

http://www.densoiridium.com/heatranges.htm

b16ahybrid

Hotter plugs meaning what the engine calls for will not have a higher chance of piston contact. Runing colder plugs is not standard, so really the so called "hotter" plugs are really standard..

mos

So are you saying you agree that hotter plugs are longer in total length? That would mean colder plugs move the spark away from the center of the combustion chamber. You guys are WRONG. The only thing that is different is the insulator. If you can post up a URL that proves you are right, by all means do so. I am trying to learn here...I just hate misinformation.