spark plug difference

02MeanStreak · 06-23-2005

I am curious how a cooler spark plug works vs the hotter counter part. I have a Mean Streak that uses NGK DPR6EA-9 plugs, but I am considering a cooler plug DPR7EA-9. Will I see any noticable difference between these two plugs? I had heard that the cooler plug may help with some of the noise that the big vulcans have. Is there any negative effects I should consider?

kingofwings · 06-23-2005

Potential fouling.... I went down 2 steps to the DPR8-EIX-9 Iridiums. 2000 miles have not had any problems. They are quieter, but do still have some noise.

john.winslow · 04-07-2007

non usa plugs the digit changes up for cooler, usa with some exceptions go up for hotter

paul-s · 04-10-2007

colder plugs are good for racing or nos. unless you run hard alot they will foul .been there. the only noise difference will be missfire. i went with nology silver.moving 1 step should be ok. i went from an 8 to a 10 when i fouled.

06-23-2005	#1 (permalink)
02MeanStreak Re-Activated BTK Beginner Join Date: Feb 2005 Location: Phoenix, AZ Posts: 53	spark plug difference I am curious how a cooler spark plug works vs the hotter counter part. I have a Mean Streak that uses NGK DPR6EA-9 plugs, but I am considering a cooler plug DPR7EA-9. Will I see any noticable difference between these two plugs? I had heard that the cooler plug may help with some of the noise that the big vulcans have. Is there any negative effects I should consider?

06-23-2005	#2 (permalink)
kingofwings Posting Slacker Forum Supporter Join Date: Nov 2004 Location: Honesdale, PA Posts: 2,546	Potential fouling.... I went down 2 steps to the DPR8-EIX-9 Iridiums. 2000 miles have not had any problems. They are quieter, but do still have some noise. __________________ *I may not have ended up where I intended to go, but I think I ended up where I wanted to be*

04-10-2007	#4 (permalink)
paul-s redline BTK Beginner Join Date: Apr 2007 Location: p'cola-fl Posts: 72	colder plugs are good for racing or nos. unless you run hard alot they will foul .been there. the only noise difference will be missfire. i went with nology silver.moving 1 step should be ok. i went from an 8 to a 10 when i fouled. Last edited by paul-s : 04-10-2007 at 11:06 PM.

04-07-2007	#3 (permalink)
john.winslow Finally Got Into First Gear BTK Beginner Join Date: Apr 2005 Location: Waterboro, Maine Posts: 54	non usa plugs the digit changes up for cooler, usa with some exceptions go up for hotter

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