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With COP ignition you can gap alot bigger than .025 for less than crazy cylinder pressures(under 100whp per cylinder). The only downside to smaller gap is not as good of a burn at lower load and rpm(read gasmilage). I would start out at .040 and then go down from there if you start to break up(spark blowout) at higher rpms.
Originally Posted by Jay'Z
What gap is good on the coppers? are those 1 step colder? is .025 safe?
i ended up picking up a set of BKR6ES-11s. i needed something right away, however havent installed them yet. did a parts search and found out the BKR5ES-11s are copper plugs for the VQ30 engine, and just went down a heat range for my use.
i ended up picking up a set of BKR6ES-11s. i needed something right away, however havent installed them yet. did a parts search and found out the BKR5ES-11s are copper plugs for the VQ30 engine, and just went down a heat range for my use.
IIRC, the VQ35 plugs actually have a longer reach than the VQ30s; your BKRs may not reach down into the combustion chamber as far as the correct VQ35 plugs.
"The VQ35DE was designed for even more low end torque. Displacement was increased from 3.0L to 3.5L using a longer 95.5mm bore (the size of your piston) and 81.4mm stroke (how far the piston travels up and down) versus the 93 x 73.3mm bore x stroke in the VQ30DE. <snip> A new long reach spark plug design improves cooling performance by increasing the water jacket around the plugs, which strengthen knock resistance and allowed the ignition timing to be advanced.
IIRC, the VQ35 plugs actually have a longer reach than the VQ30s; your BKRs may not reach down into the combustion chamber as far as the correct VQ35 plugs.
F*CK!!!! gues ill be putting a call in to CarQuest in the AM
What gap is good on the coppers? are those 1 step colder? is .025 safe?
It depends on what whp/boost you're running. If you're running say 10lbs or less you can stay with the original gap of .044 so long as you're not getting any misfires or spark blowout. If you're running big boost you can make the gap smaller say all the way down to .028. Any plug spec with a 6 is one step colder. You want to run as large a gap as possible without running into the issues I mentioned above. IIRC the smaller the gap the safer it is for your motor
i'm supercharged and i used 1step colder iridium plugs.. now i'm building the motor, so i'm putting new ones in. do you think i should switch to something else?
i'm supercharged and i used 1step colder iridium plugs.. now i'm building the motor, so i'm putting new ones in. do you think i should switch to something else?
yup, no reason to spend the extra money on iridiums.
Originally Posted by sweettalker
Platinum or Iridium?
neither, run coppers. Cheaper, better conductors, end of story.
/end discussion lol
ok, how often they should be replaced? every 3k miles?
I replace mine every 15k. But mine is a daily and 60% of that is highway miles. They always look fine.
Except a bad tune I had when I let a shop do it fouled my plugs in 700 miles.
I replace them before dyno sessions.
.
Iridium
