Originally Posted by
Cowboy
I agree that most timing changes require not much more then just removing the chrome plating but on the ones that do require going through the plating you can rough it out with carbide and finish with a diamond. Dremels do work fine. I have both dremel and jeweler grade flex shaft and there is very little difference in the cut. If you are going to go into business modding motors than by all mean get the flex shaft. If your going to mod a couple motors a Dremel will work just fine.
I do not agree that there is no difference int he cut between a Jewelers drill and a dremel....I can cut much cleaner and much more accurately with the jewelers drill, having precision foot control and the ability to cut at low RPM make the Jewlers drill far superior.......Today a good quality jewlers drill can be bought for not much more then a top of the line Dremel so cost is not really an issue... I truly feel if somone wants to start altering port timing effectively they need to start using diamond files..I truly cannot see many rookies having the tool control to alter boost port timing using a carbide in a dremel, to me that is a recipe for disaster... I have cut ports on several hundred motors to date and would never consider using a carbide, even with all my experience cutting ports I still do all my finishing with hand files......I will do my rough cutting with a dianond bit, then smooth out my cuts with a hand file......... maybe the only motor I could see the need for a carbide would be the center exhaust port of a C6, I add 15 degrees to that port which requires a fair amount of cutting...... But truly I cannot see being able to raise a boost port accurately using a carbide, i could see it making a huge mess of the sleeve to be honest......... Anyways I am not looking for a fight or anything, I just dont see how a carbide bit could be used for accurately altering sleeve port timing....