Autolite 3924 Heat Range Chart How to Determine Correct Spark Plug Heat Range
a 3924 would be a resistor plug with a heat range of 4 (3 hotter than the 3911 plug). the 1st 2 #'s (39) designate the 5/8 .750 reach plug.
I've been using Autolite 3924's in my Vic Jr. headed 393. What's the real difference? I know spark plugs have heat ranges but does it really
Working closely with engine manufacturers,. Autolite engineers have developed plugs in many heat ranges to suit all engine applications. They range from COLD
For example, the Autolite 3924 is a VERY commonly used plug in engines making up to about 600 HP or so, and it's a heat range that most stock engines use.
Autolite® Spark Plug Heat Range Chart. Tableau des températures des bougies Autolite® 8251/XS3924. 52248302. AP54058308. XP52248302. 2399, 8252/.
My engine builder put Autolite AR3924 plugs in and said to get some The '4' on the end of the Autolite part number is the temp range.
However, according to an Autolite reference chart, Autolite 86 has the same heat range as 2244 and Autolite 303 is a hotter plug than 2974.
Take a look at our Autolite-3924 (8 Heat Range), as well as other Spark Plugs available for sale here at Fig Speed High Performance Speed & Marine Parts
Sparkplug cross reference between Autolite Racing, AC Delco, NGK Heat Ranges - The larger the number after the dash the colder the plug
Within the Autolite family, this particular plug is toward the hotter side of the range that runs (cold-to-hot) 3922 – 3923 – 3924 – 3926.