Spark plug

**sloroller** · 10-02-2013, 04:58 PM

Hello first off to the ls world, been to the track with a new setup running nos and burnt a plug. Looking for the page with colder plug listings no luck running tr55 ngkplugs any suggestions on a 2step colder plug for ls1 200 shot thanks again.

**pajeff02** · 10-02-2013, 06:14 PM

I'll take a look -- the TR55's are what most of us run N/A.

**pajeff02** · 10-02-2013, 06:17 PM

Looks like the TR6 is one step colder... still looking.

**pajeff02** · 10-02-2013, 06:20 PM

From NGK's site, the "two steps colder" appears to be what you want:

Typically, for every 75-100 hp you add, you should go one step colder on the spark plug's heat range.

**pajeff02** · 10-02-2013, 06:26 PM

NGK:

NGK indicates the heat range in the middle of the plug number. For example, BCPR6ES-11 has a heat range of 6. (The number after the “-“ is the Gap.) NGK plugs are colder the higher the number, hotter the lower the number.

Starting with part # BKR6E-11 (Heat Range 6), a colder plug would # BKR7E-11 (Heat Range 7), a hotter plug would be # BKR5E-11 (Heat Range 5).

EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”)

For NGK Racing Plugs, the Heat Range is located AFTER the hyphen.

Example: R5671A-10 has a Heat Range of 10. A colder plug would be # R5671A-11 (Heat Range 11), a hotter plug would be # R5671A-9 (Heat Range 9).

Some NGK Racing Plugs are also available in half heat ranges. These are displayed as a 2 or 3 digit number after the hyphen. For example, R6120-85 has a 8.5 Heat Range and R6120-105 has a 10.5 Heat Range.

**OhTwo** · 10-03-2013, 12:28 PM

I run a 150 shot and run the NGK BR7EF (stock number 3346) on both the street and track. It seems to be a popular plug for those running something in the range where I am running.

**sloroller** · 10-03-2013, 01:14 PM

I ran a 200 shot this weekend and one of the final passes had a studer on the big end. torn into it last night and noticed for one a power wire off on the coil problem one , second took out all plugs, all day job lol and noticed one that had the tip burnt off and the ceramic cracked in too. So i take it that these are plugs aviable at your local auto parts store, thanks again for the help.