PRP Velocity Lessons

Earlie A said

I think all of your statements are correct. If you test at 28", the flow bench is reporting what is going on with dry air at that pressure. Instead of "your flow bench is lying to you", we should say "your assumptions about your flow bench data may be incorrect". If the bench is calibrated, the data is correct.

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People take flow numbers as gospel often times. I know I used to. The truth is it's a tool used to try to understand what is happening with the flow going through some passage, in our case, cyl heads. The problem with that is it's not "really" what's going in inside the head in it's intended environment. So, yeah, it's lying to you. Also, calibration is bench specific so your bench "calibrated" to 28" will differ from what @pittsburghracer might see.

This is NOT an attempt to argue, it's how I learn so feel free to ignore if you like :)

At the end of the day, I'm sure we CAN agree it's a damn useful tool and in the right hands (not mine) it can tell volumes of what's going on.

Thanks for your post, I rather enjoy the nerd side of things.