Pagoda SL Group

W113 Pagoda SL Group => Electrical and Instruments => Topic started by: rosch on June 23, 2024, 08:03:28

Title: sparkplug internal resistance
Post by: rosch on June 23, 2024, 08:03:28

General concensus is to use NON-resistor sparkplugs ie NGK BP5es in our SL's iso (supression) resistor plugs like NGK BPR 5es.
However when I use an Ohmmeter and measure the internal resistance of my brand new non-resistor BP5es my measurement varies between just a couple of Ohms to a few hundred Ohms . Quite a spread . Is this normal ?
My idea is it should be somewhere close to 0 Ohms.
Hope somebody will shed a light on this.

Title: Re: sparkplug internal resistance
Post by: BobH on June 24, 2024, 11:43:51

Hello, from what i understand, non resistor plugs have an internal resistance of between 1K and 2K ohms, depending on the make and type.  Resistor plugs can be 4K or well over, a massive difference.  Add to that the resistance of the plug wires and you can see why fitting the correct plugs and wires is important for correct running

Title: Re: sparkplug internal resistance
Post by: mauro12 on June 24, 2024, 15:00:37

Is it true that Bp5es ngk are starting to be difficult to find ?

Title: Re: sparkplug internal resistance
Post by: rosch on June 24, 2024, 19:09:28

@mauro 12,

Still no problem to obtain NGK BP5ES non-resistor. You might find them by searching  for NGK article number 6511 or
EAN: 0087295165119