After that, there are some low-cost options open to you in terms of air die grinders. The compressor takes your main cash outlay for an air-powered porting system. Consider 4 scfm at 90 psi a minimum with 5 to 6 scfm as a good working capacity compressor for just about all the regular types of die grinders. Air grinders are cheaper, if you already have a compressed-air source. If you are just starting out, you need to consider the pros and cons of the two most popular types of die grinders: air and electric. Other than the components we are going to port for more airflow, there are many aspects of an engine that can be improved with the aid of a die grinder, some carbide cutters, and a box of emery rolls. Sticking the end of a shop vac into the open end of the port you are working on not only helps keep your shop a whole lot cleaner but it also allows you to see what you are doing in the port while it keeps it clear of 99 percent of the cutter/emery-roll debris. Using a shop vac to keep the work area clean is also a very good idea. I can be very categorical here because I found out the hard way! You don’t need to do that many times before lung damage (usually silicosis) goes from a possibility to a certainty. Do not, for any reason, use abrasives without first putting on a mask. With your eyes taken care of, it’s time to consider your lungs. This 3.6-scfm-at-90-psi grinder just barely made the grade for air-powered die grinders.
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