Review on 🔥 NGK 4904 Spark Plug - Pack of 4 (Improved SEO) by Brett Robinson

These spark plugs are great! They are pre-sewn. just screw it on and forget about it for 100,000 km. Put them on my 2015 Tacoma 4.0L V6. A small but significant improvement over stock plugs with 30,000 miles on them. I have a 6 speed manual and it's easier to slam out of 2nd gear, the engine doesn't jerk or jerk and acceleration from traffic lights feels a little springier. As a note. I have also fitted NGK Laser Iridium spark plugs to my Bandit 1250 4 cylinder motorcycle with the same results. The bike is already a torque monster, but just installing these plugs allows the bike to go 300-400 rpm lower before there is a hint of drag. Acceleration from a standing start became smoother and more powerful. There are videos on YouTube from Cycle Solutions where they dyno test a Harley comparing new factory spark plugs to new laser iridium spark plugs and increasing the horsepower and torque. As? Compressed air is actually an insulator. With increasing pressure in the combustion chamber, the electrical resistance between the electrode gaps of the spark plugs increases. With a fine wire spark plug, which is a laser-cut iridium construction (a type of fine wire also used in aircraft spark plugs), a spark forms and breaks through the insulation faster. The spark builds up faster due to the thin wire construction and the use of iridium ensures long life. On a dyno chart, this will cause your torque curve to start about 300-400 earlier and last a bit longer on the top end. Depending on your engine setup, this may indicate a little more horsepower. But if you feel like accelerating from a standstill, the engine can enter its torque curve sooner.