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MG TD TF 1500 - Supercharging spark plug choice

I am about to install the Moss supercharger to my 52 TD, I've read that you need a colder plug...I currently run NGK B6HS plugs (short reach) does that mean I should switch to NGK B7HS? Has anyone who supercharged gone to a colder plug? I've also read that you should decrease the gap, is that true?
Bob Dougherty

Bob,

I used N3s on my Marshall-blown TD, or one range colder than standard.

I trust you have solid state ignition and a good, healthy coil (30,000 volts). Don't be afraid to open the gap to .035

Today's fuels have qualities that promote quick ignition. A far cry from what I had to deal with!

Gord Clark
Rockburn, Qué
Gord Clark

I run NGK 8's in both of my supercharged MG's which would be the equivilent to the Champion N3's . No reason to change the gap unless you have updated the ignition system in which case you can open it up. I would highly suggest that you send off the distributor to Jeff @ Advanced Distributors and have it recurved for the super charger.
L E D LaVerne

I try to go with platinum tip plugs which are superior for spark and are inherently colder.
JIM N

LaVerne,

Are they BP8ES or B8ES.

Thanks,
Jim
James Neel

I'd have to go look Jim.
L E D LaVerne

L.E.D's suggestion of having the dizzy recurved is a good one. Alternatively, it could be retarded a bit. The higher the boost (or higher the compression ratio) the less advance is needed.
Bob
R L Schapel

This thread was discussed between 27/05/2019 and 29/05/2019

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