Autolite 124


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By GREENBIRD56 - 15 Years Ago
I like Autolite sparkplugs - they've proven themselves well over the years in my Fords .....so I'm prone to keep using them. The other day I ran across a box of 124's, they are the next step colder than the 45's and are the standard type of resistor construction. Would they be a good choice for a bit cooler tip than the 45's running in my driver car (which look a little hot to me). The 124's are the coldest resistor type 18mm x .468 reach plug shown on my Autolite heat range chart.

Is anyone already using this plug? and what sort of induction/ignition set-up is on the engine?

By Ted - 15 Years Ago
Ditto on your comments on the Autolite sparkplugs.

The Autolite 124’s are similar in heat range to the old BTF-1’s.  Very cold so they work well where the compression is increased or the rpms are sustained at the higher levels.  I used the 124’s in Randy Gummelt’s dragster engine and they worked perfect in that application with 7½:1 cr and 16 psi of boost.  Any instance where the compression ratio is 11.0:1 or higher on a normally aspirated Y, then I’ll consider their use in lieu of the more expensive racing spark plugs.  The 124’s do have a very thick ground strap so I cut the end of the strap back in line with the center of the spark plug before installation just to unshroud the spark.  I’m doing the final details for a 12.0:1 Y engine right now and it will have the 124’s by default for the dyno pulls.  Regarding ignition setups, I fall back to the MSD ignitions anytime higher than normal compression ratios and the use of colder spark plugs come into the picture.

By mctim64 - 15 Years Ago
Ted (7/8/2010)
Ditto on your comments on the Autolite sparkplugs.

The Autolite 124’s are similar in heat range to the old BTF-1’s.  Very cold so they work well where the compression is increased or the rpms are sustained at the higher levels.  I used the 124’s in Randy Gummelt’s dragster engine and they worked perfect in that application with 7½:1 cr and 16 psi of boost.  Any instance where the compression ratio is 11.0:1 or higher on a normally aspirated Y, then I’ll consider their use in lieu of the more expensive racing spark plugs.  The 124’s do have a very thick ground strap so I cut the end of the strap back in line with the center of the spark plug before installation just to unshroud the spark.  I’m doing the final details for a 12.0:1 Y engine right now and it will have the 124’s by default for the dyno pulls.  Regarding ignition setups, I fall back to the MSD ignitions anytime higher than normal compression ratios and the use of colder spark plugs come into the picture.

Good info!  Thanks Ted.