MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Recommendations

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

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

MG TD TF 1500 index

This thread is from the archives. Join the live MG TD TF 1500 BBS now