Spark plug info & hard to find info

chromebumpers

solid fixture here in the forum
Staff member
AC. http://www.gsparkplug.com/brands/ac?p=2

AC Delco



Albert Champion was a champion bicycle racer who came to America in 1899. He established the Champion Spark Plug Company in Boston and Robert A. and Frank D. Stranahan invested in this company. Albert Champion left this company in 1908 after a disagreement with the Stranahan brothers.


Albert Champion had at least one spark plug patent (from 1898). In 1908, Champion had a meeting with William C. Durant of the Buick Motor Company concerning producing spark plugs and other ignition parts for Buick, which was a founding General Motors brand. Durant moved Champion to Flint, Michigan and the Champion Ignition Company began business.


However, the Stranahan brothers had the name “Champion” trademarked so in 1908, Albert Champion set up another business with the Buick Motor Company called the AC Spark Plug Company (using Albert Champion's initials).


Alfred P.Sloan reorganised GM in 1916 into AC Division as a producer of spark plugs, speedometers and other equipment for sale to other manufacturers of cars. Sloan named Albert Champion the president of the AC Division company.


Champion died in 1927 and General Motors bought the remaining stock owned by Champion's estate and took over the AC company.


Charles A. Lindbergh used AC plugs during his historic solo flight across the Atlantic in May 1927, and later praised their reliability.


In 1974 General Motors merged AC and United Delco divisions to create AC-Delco.


It has a long history and has been known as ACDelco, United Delco, United Motors Corporation and United Motors Service.


AC Spark Plugs and The Green Spark Plug Company.


Our AC spark plugs are the last remaining stock. The stock is reducing but we do buy any AC surplus stock that we can source.


You can buy AC spark plugs through our website or we are available for telephone enquiries and orders.

http://www.gsparkplug.com/brands/ac?p=2
 
NGK Is a Favorite for Ford Drag Racers using Boost, Supercharged & Turbo Charged.

Nice Article Richard.
 
How to find the heat range with different manufactures


Autolite:

Autolite indicates the Heat range with the last digit of the part number. For example, 3923 has a Heat Range of 3. The higher the number, the hotter the plug. The lower the number, the colder the plug.

For example, starting with part # 24 (Heat range 4), If you want a colder plug you would use part # 23 (Heat range 3), for a hotter plug you would use part # 25 (Heat Range 5).



Bosch:

Bosch indicates the Heat Range in the middle of the plug number. For example, FR6DC+ has a Heat rangeof 6. Bosch plugs get hotter the higher the number, colder the lower the number.

Starting with part # FR6DC+ (Heat Range 6), a colder plug would be # FR5DC+ (Heat Range 5), a hotter plug would be # FR7DC+ (Heat Range 7).



Champion:

Champion indicates the heat range in the middle of the plug number. For example, RV15YC6 has a heat range of 15. (The 6 at the end of this part indicates the Gap setting.) Champion plugs are hotter the higher the number, colder the lower the number.

Starting with part # RCJ7Y (Heat Range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (Heat Range 8).



Denso:

Denso indicates the heat range in the middle of the plug number. For example, SK20PR-A11 has a heat range of 20. The number at the end of the part indicates the Gap.

Denso Iridium Power plugs feature the Heat Range at the end of the part number. For example, IK20 has a Heat Rangeof 20. Denso plugs get colder the higher the number, hotter the lower the number. Starting with part # IK20 (Heat Range 20), a colder plug would be # IK22, a hotter plug would be # IK16.



NGK:

NGK indicates the heat range in the middle of the plug number. For example, BCPR6ES-11 has a heat range of 6. (The number after the “-“ is the Gap.) NGK plugs are colder the higher the number, hotter the lower the number.

Starting with part # BKR6E-11 (Heat Range 6), a colder plug would # BKR7E-11 (Heat Range 7), a hotter plug would be # BKR5E-11 (Heat Range 5).


EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”)

For NGK Racing Plugs, the Heat Range is located AFTER the hyphen.

Example: R5671A-10 has a Heat Range of 10. A colder plug would be # R5671A-11 (Heat Range 11), a hotter plug would be # R5671A-9 (Heat Range 9).

Some NGK Racing Plugs are also available in half heat ranges. These are displayed as a 2 or 3 digit number after the hyphen. For example, R6120-85 has a 8.5 Heat Range and R6120-105 has a 10.5 Heat Range .




Pulstar:

Pulstar indicates the Heat Range by the number "1" or "2" in the plug number.

  • Pulstar Heat Range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16.
  • Pulstar 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63.
At this time the colder Pulstar Heat Range 2 is only available in 2 racing plug designs, BE-2rT and HE-2rT.
 
thanks GREAT INFO
plugseat.jpg

testing ignition coil
http://www.aa1car.com/library/ignition_coils.htm

http://garage.grumpysperformance.com/index.php?threads/installing-hard-to-access-plugs.962/

gappingpl.jpg



WATCH THE VIDEO

 
Last edited:
DELCO

Dayton Engineering Laboratories Company

William C. Durant
Crapo

Did I mention I love history!!

Thanks
Randy
 
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