[ToroWhirlwind1970]

The 60s/70s Toros with the Tecumseh engines called for Champion J-8 spark plugs. The more recent equivalent is the Champion J-8C. But, I have a 10-pack of NOS Champion UJ-8. Are they the same as the J-8 ? What's the story on the two? Was one produced before the other? ??? Thanks for any info.

 

[Five Points]

I'll have to dig into that one unless some else has some info on it.

 

[Mark / Ohio]

J8C Plug Specifications

• Thread Size: 14mm
• Hex Size: 13/16" (20.6mm)
• Reach: 9.5mm (3/8")
• Seat Type: Gasket
• Heat Range: 8
• Resistor: No
• Brand: Champion

Center Electrode

• Type: Standard
• Material: Nickel
• Projection: Non-Projected

Ground Electrode

• Type: J-Gap
• Material: Nickel
• Quantity: 1

UJ8 crosses to an RJ8C:
RJ8C Plug Specifications

• Thread Size: 14mm
• Hex Size: 13/16" (20.6mm)
• Reach: 9.5mm (3/8")
• Seat Type: Gasket
• Heat Range: 8
• Resistor: Yes
• Brand: Champion

Center Electrode

• Type: Standard
• Material: Nickel
• Projection: Non-Projected

Ground Electrode

• Type: J-Gap
• Material: Nickel
• Quantity: 1

Going from memory I think the only difference with the old J-8 was a longer porcelain top like an automotive plug and no resistor where the newer replacements is a stubby version. (Edit: the CJ8 might be the stubby version, thinking the 'C' on the front stood for 'compact'. Some of the older ones did have a tip that would unthread off for attaching plug wires with eyelets instead of a clips. That might account for the difference too.)

Champion has a pretty slick sight. You can even measure your old plug and enter them in the reverse engineer section to find a replacement.

http://www.championsparkplugs.com/Search.aspx?ptn=Spark+Plug