Even though you know you have to take absolute flow numbers with a fair pinch of salt ( you have happy benches just as you have happy dyno’s) I feels kind of bad when you get numbers after recalibrating that are a low lower than before. This time I fitted the Audietech test orifice in a plate that I can put on the plenum without having to take things apart and recalibrate before each testing session. My flowbench seems pretty unhappy now.
A few retests where in order.
1) 51 and 52 are just same setup as test 50 just with new calibration 53 and 54 are with a clay radius directly on the head and a 12.7 mm carb spacer.. Note that the re tests ( 51-52) are pretty much the same and well within 1%. And that there is no significant difference between a clay radius and a carb spacer with a BIG mismatch.