I've touched on this subject plenty of times, and that is boost porting cag barrels. The possibilities are almost endless for how many ports you cut in, how tall they are etc etc. So im just slowly going through them testing what works and what doesn't.
This is barrel number 5 to get tested. Nothing too special aside from a few pics to show how i do it as i didnt have many in the last blogs ive mentioned it.
Borrowed a friends milling machine as mine is still halfway through an upgrade. A little overkill perhaps :P
I had a jig made up that was a big angle plate and the exhaust port bolted to it, but clamping it in the milling vice worked just great surprisingly. i was expecting the fins to break but the cutting forces are so low on account of the metal being so weak, its not a problem.
Taking the first few cuts with a 1/2" ball nosed end mill. Id already had a single 1/2" port milled in. im just enlarging it on each side (not giving away any figures unfortunately :P)
Tadaaa. The ports all done now. This kind has been refered to as a "3d" port. All that remains is to change to a square shoulder end mill and clean the piston skirt up.
One complete barrel! Fortunately/unfortunately (which ever way you look at it i guess ;p) The ring locating pins now interfere with the port, so ill either redrill the locating pins or upgrade to a billet flat top piston. I think i know which one ill be doing!
For any queries about having this work done to your own cylinders/barrels shoot me an email at Glen.M.R@gmail.com
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