Hi,

Could someone explain the difference between the R44S plug, and the 44S Plug.

Thanks,

Tom

 

R44S is a resistor plug, 44S is not.

- Eric

 

Eric,

Thanks for the reply. What does the resistor do?

 

Resistor plugs have resistors in them, which slightly attenuate the current as it flows through them. This reduces radio interference (especially AM), and helps to tune the LRC circuit of the ignition coil / condenser system.

In general, you will not notice any difference in operation between resistor and non-resistor plugs.
You are also probably using resistor wires (unless they're solid copper or stainless steel).

- Eric

 

And.... neither one of these is made anymore....
They stopped making non-resistor plugs 20 + years ago -- because "there was no need" -- according to the companies -- so what if you get robbed of some of your performance... their thought was that it was negligable.....
The R44S heat range is no longer in production....
there used to be a 43, 44 , 45, and 46 ---- now it's just 43 and 45....

Such that, if your motor is running nicely -- use the R43S (a tad colder)
That leaves you, as your motor gets older -- the option to go to a hotter
plug -- the R45S (a tad hotter)............

Looking at the spark plug can be an indicator as to how your motor is efficiently running......

 

Thank you!

 

I understood that in the UK at least non resistor plugs and copper core plug wires were outlawed for street use as part of measures to suppress radio interference.
I remember watching tv at my grandparents in the very early '60s, and every time an unsuppressed vehicle passed their house the picture and sound got scrambled.


Roger.

 

All that chrome cladding under the hoods of 60s and 70s Corvettes is there for that reason. Fiberglass firewall.