Autolite ar3933 heat range. These replacement spark plugs are available in colder heat ranges than most plug manufacturers to support modified engines. . Engineered with a cut-back ground electrode that delivers optimal ignitability of the flame kernel and better heat transfer, leading to quicker starts. Yttrium-Enhanced Alloy enables up to 8% reduction in sidewire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions. Other factors effecting Heat Range are the thermal characteristics of the insulator and the bond of the insulator to the shell. Example a AR3935 (good street/strip plug) is hotter than a AR3932 plug which is very cold used for lots of nitrous. Note: Please use the Vendor Number to reference the PDF chart links listed. Heat range needed with Standard tip or Power tip: Hotter. The yttrium-enhanced alloy enables up to 8% reduction in ground wire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions. In both regards, Autolite plugs are superior. Jul 24, 2007 · If they are, Autolite 3923 or 3924 and AC Fr3LS or Bosch 7557 may work if they are the heat range you need. Dec 29, 2014 · Autolite Heat Ranges - The larger the last digit in the part number, the hotter the plug is. Autolite Racing spark plugs feature a cut back ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Most autoparts store I have been to can not cross reference an AR3933 because it is a racing plug and they simply don't carry them. Most parts stores have a cross referance chart. They contain an Yttrium-enhanced alloy, which enables up to 8 percent reduction in side wire temperatures for improved durability and less pre-ignition. They provide cut back ground electrode, anti-corrosive nickel plating and large ground electrodes for better heat transfer. yuy cqb rhc ldk ujp gia joa kpe ojz fle nka bsi ffh wci nvk