I used the forum’s VE calculator to work out the ideal barrel length for my Gen 9. Great little calculator it is too.
Apparently to get a ratio of about 1.7:1 I need a barrel length of about 425mm using a 7.3 inner. I don’t want to go that long, I want to keep it at it’s current length of 350mm. So I’m looking at porting the 100% cylinder.
Using the calculator to work out porting I get this figure :
I take it to mean I should have 57.45mm of full cylinder, from the end of the porting to the cylinder head?