X-Head Porting....

yellow rose said
You need to be able to control cutter speed. You just can’t run them wide open all the time. I can use either but I prefer an air grinder.

It looks like your carbides have a pretty big diameter . When the ports are as small as what you are doing, and you need all the area you can get, I don’t use anything bigger than 1/2 inch and 3/8 most of the time.

A big corner radius in a perfect world is best. That head ain’t near perfect nor can it be made perfect. So corner radius need to be 1/2 or smaller. I’ve done some at 1/4 inch but that was a giant PITA for little return.

Look at the W2 port. It is to small for anything 340 inches and smaller over about 8000 RPM and as the displacement goes up the RPM at which the head is the limit goes down.

If you want to make the W2 enough cross section for stuff like that the option is to make them square. Another giant PITA.

You need to learn the relationship between cross section, displacement, RPM, Rod to stroke ratio (it matters), camshaft LSA, induction, exhaust, chassis, gearing and such.

Can you explain the bit size to me? Like the width and length of the cutting surface is 1/2 long - 3/8in width?

I'm not having much success with these burs and this die grinder. I actually prefer doing it with my hand drill because its variable speed. The bits jump to much, are a little to big , and catch to much; at least they have been for me...

Here's where I ended. I'm happy with everything EXCEPT the spots I can't reach and the part where the valve goes through. I can't reach some spots and when I start getting in there the burs kept catching, thats how I ended up with a broken bit; it barely caught, jumped and pow. The bent bit is what happened right when I turned my die grinder on, the bit just bent... well maybe ill get a dremel and do it with some smaller burs and slower speeds..