What's the difference between resistored spark plug with non-resistor one ? (1 Viewer)

[schaats]

Hi,
I have a question about spark plug.
OEM spark plug for my carb. 3F is Nippon Denso W14EX-U. It's non-resistor type, I heard.
But OEM plug for US 2F motor is W14EX-RU.
The letter R means resistor.
I'd compared those two type of plugs before (W14EX-U, W14EX-RU) but I couldn't catch any dfference when driving.
What are differences between resistor type with non-resistor type ?

Thank you,

Oh, Min Seok

 

[dfmorse]

Schaats;

In a nut shell, a resistor plug presents a dampening to the high voltage impulse when the plug fires. This helps reduce RFI (Radio Frequency Interference). The resistor plug won't affect drivablity or engine performance very much.

The non-resistor type plug will allow an increase in RFI.

...

 

[WckedMidas]

RFI is that whineing sound you get threw you radio from poor electrical conections and cheap plug wires