AFR Headed guys, Spark plugs?
#2
TECH Senior Member
iTrader: (3)
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 4 Likes
on
4 Posts
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)
#4
TECH Senior Member
iTrader: (3)
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 4 Likes
on
4 Posts
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).
Trending Topics
#9
11 Second Club
iTrader: (4)
Join Date: Nov 2001
Location: Woodinville, WA
Posts: 787
Likes: 0
Received 0 Likes
on
0 Posts
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).
#10
TECH Fanatic
Join Date: Jan 2004
Location: Kingfisher Oklahoma
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
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.
#17
10 Second Club
iTrader: (26)
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.