fatdoggy:
I mean't budget conscious racers shouldn't use Putnam Green Brushes on the + and -. With a Putnam Green on the + and a blue on the - you'll get just as much power as green on both and much better brush life.
JayBee:
i agree Putnams are where its at! Has your friend tried putting a putnam blue on the -. i played around with them on a friends dyno and found that I could get the same power using a blue on the - with much less wear on both the com and the brush. Usually going up one spring grade on each side from what you would usually run with other brushes combined with a Putnam Green on + and a Blue on - gave the best results, for monsters anyway.