What's the difference between resistored spark plug with non-resistor one ?

Joined
Apr 3, 2005
Messages
284
Location
Kyunggi, South Korea
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
 
Joined
Jul 7, 2004
Messages
1,518
Location
EVERGREEN, CO, USA
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.

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