[Mg-t] RN4C vs RN5C

Tue Apr 16 06:24:38 MDT 2019

    RN5 is what I always used, aside from experiments with NGK. They had the nice tan colour one wants.  Fuel in CT is 10% alcohol, and the engine ran very nicely. 
   BPR6 is approx the same heat range, also used in MGBs.
   Either should work well for you. Just judge by the colour.
Bob


> On Apr 15, 2019, at 8:49 PM, Richard Lindsay <richardolindsay at gmail.com> wrote:
> 
> Hello Friends, 
>    If using Champion spark plugs in a '53 TD with 89 octane petrol at (up to) 10% alcohol, is it advisable to use a slightly hotter plug (RN5C) versus the recommended (RN4C) plug? I also have NGK BPR6EIX platinum plugs in hand, in the correct heat range. Advice?  
> 
> Rick
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