Denso Iridium Spark Plugs

[TwinTurbo]

Bocsh platinums suck. They have a high failier rate. I fell victome to a bad Bocsh+4. Two of the electrodes broke off and and cost me a head in my Daytona turbo. I posted about it on another forum i belong too (MX6.com) and as it turns out many people have noticed cracks around the botom of the electrodes with only a couple thousand miles on them. I only had a little over 600 miles on my plugs new top end when it whent boom. So as far as the +4's go i cant stress it enough to just trash them.

As for worn plugs. Electricity travels on the surface and little deposits and bits of corosion that you might not even be able to see will affect the acuracy of the spark and will change the level of combustion. When a larger spark is created it egnites more fuel at once, causing a hotter and more powerful combustion.. Inside the combustion chamber the explosion starts at the plug and moves in whatever direction has the best A/F mixture. Hence the purpace of swerl or fast burn head desighns. So plug age ia a verry important factor in anny performance engine.......