AFR Headed guys, Spark plugs?
06-15-2008, 07:28 PM
#2
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From their site:
180cc LT1:
Spark Plug Starting Range AC FR3LS or 41629
215cc LT1:
Spark Plug Starting Range Autolite 3910
195cc LT4 recommends same as 180cc and 210cc/227cc LT4 recommends same as 215cc.
From LS1.com's Reference Chart for LT1 AFR heads.
Plug: NGK 5672A-9 (stock number 7405); Autolite AR3910; Champion C59YC (stock number 792); Denso IQ27 (stock number 5315); Denso IQ01-27 (stock number 5708)(diagonal platinum ground); Denso IQ02-27 (stock number 5711)(horizontal platinum ground)
180cc LT1:
Spark Plug Starting Range AC FR3LS or 41629
215cc LT1:
Spark Plug Starting Range Autolite 3910
195cc LT4 recommends same as 180cc and 210cc/227cc LT4 recommends same as 215cc.
From LS1.com's Reference Chart for LT1 AFR heads.
Plug: NGK 5672A-9 (stock number 7405); Autolite AR3910; Champion C59YC (stock number 792); Denso IQ27 (stock number 5315); Denso IQ01-27 (stock number 5708)(diagonal platinum ground); Denso IQ02-27 (stock number 5711)(horizontal platinum ground)
06-15-2008, 07:56 PM
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AC 5 and FR1LS (delco) is the interchange for 3924. So maybe an AC 4?
And Champion 71 also if that helps any. I wa able to dig this up as well:
* NGK Heat Ranges - The larger the number after the dash the colder the plug is. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications)
* Autolite Heat Ranges - The larger the last digit in the part number, the hotter the plug is. Example a AR3935 (good street/strip plug) is hotter than a AR3932 plug which is very cold used for lots of nitrous.
* Champion Heat Ranges - Typically Champion numbers in the same series the larger the number the hotter the plug.
*shrug*
If you come up one a number and want it interchanged to another brand, toss it up and I'll see what I can do (if you have no way of doing it).
And Champion 71 also if that helps any. I wa able to dig this up as well:
* NGK Heat Ranges - The larger the number after the dash the colder the plug is. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications)
* Autolite Heat Ranges - The larger the last digit in the part number, the hotter the plug is. Example a AR3935 (good street/strip plug) is hotter than a AR3932 plug which is very cold used for lots of nitrous.
* Champion Heat Ranges - Typically Champion numbers in the same series the larger the number the hotter the plug.
*shrug*
If you come up one a number and want it interchanged to another brand, toss it up and I'll see what I can do (if you have no way of doing it).
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06-16-2008, 12:01 PM
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Forgot the number but...I use heat range 7 on my DD (for later N2O shot) otherwise 4 worked fine....But I'm also closed loop at idle....
For guys with closed loop and big cams this may help
I have a many hours getting the damn cyl balance right (at idle) so the car won't go +25, -25 bank to bank. On my combo, 7 and 8 cyl needed 25% less fuel to stay at 300 temp (damn idle reversion), they were 140-170. I also believe that 2 and 6 needed some work, finally got all the rest around a 400-450 temp (uncoated hearders).
For guys with closed loop and big cams this may help
I have a many hours getting the damn cyl balance right (at idle) so the car won't go +25, -25 bank to bank. On my combo, 7 and 8 cyl needed 25% less fuel to stay at 300 temp (damn idle reversion), they were 140-170. I also believe that 2 and 6 needed some work, finally got all the rest around a 400-450 temp (uncoated hearders).
06-16-2008, 12:35 PM
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The ones AFR recommends are etremely cold go at least 2 or 3 steps hotter for 10:1 compression. I like the AR autolites, they have the electrode trimmed already and are a nice plug.
08-21-2009, 01:53 AM
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Bumping this old thread. Im currently having this same issue. High compression with a 200 shot. Im thinking Ill use the 3910 or a AR3933. I see alot of plug changes in my future.
08-23-2009, 04:58 AM
#17
here's what i got from a mustang website... 1 is hottest, 6 is coldest
1) 3924/AR3924 - projected tip, resistor
2) 3923/AR3923 - projected tip, resistor
3) 3922 projected tip,resistor - AR3935 standard tip,non resistor
4) 3911/AR3911 projected tip,non resistor - 3934/AR3934 standard tip,non resistor
5) 3910/AR3910 projected tip,non resistor - 3933/AR3933 standard tip,non resistor
6) 3932/AR3932 standard tip,non resistor
i haven't pulled on of the 3923s yet on my new motor, judging by how it looks i'll go with the 3934s for a 150 shot, you don't want the projected tip on nitrous correct?
1) 3924/AR3924 - projected tip, resistor
2) 3923/AR3923 - projected tip, resistor
3) 3922 projected tip,resistor - AR3935 standard tip,non resistor
4) 3911/AR3911 projected tip,non resistor - 3934/AR3934 standard tip,non resistor
5) 3910/AR3910 projected tip,non resistor - 3933/AR3933 standard tip,non resistor
6) 3932/AR3932 standard tip,non resistor
i haven't pulled on of the 3923s yet on my new motor, judging by how it looks i'll go with the 3934s for a 150 shot, you don't want the projected tip on nitrous correct?
Last edited by Wicked94Z; 08-23-2009 at 05:04 AM.
