Brian, Unless there is a legitimate reason to run other than normal spark plugs, Ross is right; platinum plugs do not increase the fire but rather just last longer. BUT, be careful on how you handle the plugs as the platinum tips are easily damaged, ie knocked off, especially if you are trying to gap them. Bosch platinum plugs come pre-gapped to approximately .044, which is a good gap for most late model engines. If your engine is running between say 8 to 1, 9 to 1 compression then this is a good gap. Higher than that, and you need a smaller gap to compensate for the denser air mixture, or it will be too hard for the spark during constant loads due to the leaner mixture reducing the ease of firing compared to rich mixture given the same compression ratio. Just watch the heat range and if given a choice, select a heat range one step lower rather than higher. That will give added help in preventing detonation. Colin Rainey KR2(td) crain...@cfl.rr.com Sanford, Florida FLY SAFE!!!!
