2 step colder plugs
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Joined: 03-23-06
Posts: 692
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From: Orlando, FL
it is a plug that operates in a colder heat range than stock/oem plugs, which keeps temps down within the combustion chamber to further help resist detonation. this is ideal for nitrous because of how violent the combustion process is, and detonation on stock internals will result in damage to internals (typically a broken ring land or damaged valve).
for example, I run two step colder plugs in my 2.2 (NGK BKR7E's specifically) and they work great. now they are also a shorter plug than stock, but that isn't really much of an issue, and helps force the flame down from the top and center of the roof and onto the piston. one step colder plugs can be found in the form of the stock Neon SRT-4 plugs, and are the exact length.
typically it's rule of thumb to go one step colder for 35-50 shot, and two steps colder for 50-75 shot.
for example, I run two step colder plugs in my 2.2 (NGK BKR7E's specifically) and they work great. now they are also a shorter plug than stock, but that isn't really much of an issue, and helps force the flame down from the top and center of the roof and onto the piston. one step colder plugs can be found in the form of the stock Neon SRT-4 plugs, and are the exact length.
typically it's rule of thumb to go one step colder for 35-50 shot, and two steps colder for 50-75 shot.
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Joined: 10-21-06
Posts: 3,796
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From: South Carolina
it is a plug that operates in a colder heat range than stock/oem plugs, which keeps temps down within the combustion chamber to further help resist detonation. this is ideal for nitrous because of how violent the combustion process is, and detonation on stock internals will result in damage to internals (typically a broken ring land or damaged valve).
for example, I run two step colder plugs in my 2.2 (NGK BKR7E's specifically) and they work great. now they are also a shorter plug than stock, but that isn't really much of an issue, and helps force the flame down from the top and center of the roof and onto the piston. one step colder plugs can be found in the form of the stock Neon SRT-4 plugs, and are the exact length.
typically it's rule of thumb to go one step colder for 35-50 shot, and two steps colder for 50-75 shot.
for example, I run two step colder plugs in my 2.2 (NGK BKR7E's specifically) and they work great. now they are also a shorter plug than stock, but that isn't really much of an issue, and helps force the flame down from the top and center of the roof and onto the piston. one step colder plugs can be found in the form of the stock Neon SRT-4 plugs, and are the exact length.
typically it's rule of thumb to go one step colder for 35-50 shot, and two steps colder for 50-75 shot.
Senior Member
Joined: 03-23-06
Posts: 692
Likes: 0
From: Orlando, FL
the heat range is typically (on ngk plugs anyway) stated where the number is halfway through the part number. BKR5E would be range 5 (stock range), BKR6E would be range 6 (one step colder), BKR7E is range 7 (two steps colder).
the bkr7eix is the same heat range as the bkr7e and bkr7e-11, but I believe it's just a different core material, probably iridium (the 7e and 7e-11 are copper core)
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agentirons
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Oct 16, 2015 02:11 AM