I opened the exhaust port to achieve max flow with no restriction. On this day that was 344CFM. I set the head on my pipe. I opened the exhaust port to 10in of water in the tube while at .600 lift and wrote down my percentage. 86.5. 86.5 of 344 equals 297.56. Then I closed the valve to .500 readjusted the port to 10in and wrote down the percentage. 86. 86% of 344 is 295.8. I did this all the way to .100.
My numbers on the intake side were. This was with no clay on the port. When I added clay the numbers went up about 10CFM across the range.
.600=86.5 86.5 % of 344=297.58
.500=86 86% of 344=295.84
.400=85.5 85.5%=294.1
.300=79 79%=271.7
.200=73 73%=251.1
.100=52 52%=.178.8
Like I said, I am no expert but that is higher than the unported Econo W2 I checked by a good bit. I did not write that number down but I want to say 258-260 was that number.
