Direct Connection ( Mullen LA ) heads

yellow rose said

I’m mostly looking at the test pressure. Are you sure it at 10 inches and not higher? I’m not one of those guys who think every bench (even home built benches) should read wildly different. That’s why I’m asking. Do you correct for ambient temperature and barometric pressure?

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I opened the exhaust port on the bench 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 on the intake valve 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. I use this bench at home and it works for me.