The 3.178 psi, or 88 inches H20, is the result of the kinetic energy in the air stream being stopped by the closed Intake Valve.
This is different to the differential pressure across the valve seat when the valve is open - which is what you would want to simulate in a Flow Test. <<
the Pressure Differential and the Tuned Sound Wave moving thru the mixture is probably causing atleast the last 221 CC's to be moving at 620 fps to get 121.6 Ve% or a chance at turning an 14.8:1 CR into a dynamic 18:1 CR engine ....This last 221 CCs has to make it inside before the Intake valve closes, when it does, it should give 3.178 psi above atmospheric pressure inside the cylinder at the IVC point, and 121.6 Ve% approx
where is the last 221 CC's located ??
just before the Short Turn Apex towards/including the Bowl Area and Valve Job area ...the most important parts of the Port, besides the Total Induction Lengths/Cross-Sectional Areas,..where the Valve Job/Curtain Area, Chamber walls have the last chance to influence Flow
it might not be possible to make a Steady-State FlowBench make a Port go into Actual Sonic Choke at .55 Speed of Sound (613.8 FPS/ 86 Inches)
With a FlowBench, you don't have a Sound Wave moving back and forth,
and the effects of Induction Length
the FlowBench is a "Steady-State Device"
and the Engine is a "Batch-Processor Device"
being a Batch-Processor, Inertia /lag times will cause greater pressure differentials in a Live engine causing Port to go into Sonic Choke as early as .55 Speed of Sound , especially with a Fuel like gasoline or methanol
inside the Port with its Inertia influences and its Temperature/Cooling effects, affecting the Speed of Sound inside the Port
1116 FPS = 284.2 Inches of Water, Speed of Sound in Air at 59F/Sea Level
the Speed of Sound = ZERO in a vacuum
>>It will be able to pull 60+ inches with ease, and I have designed it so that I can easily upgrade it to higher pressures (100-120") with a simple add-on.
I am intending to do wet flow testing at high pressures, but I don't know how this will affect visibility of the wet test, etc.<< - OZRACE
OZRACE ... could you Post some Pics or some Flow Test results when you get some Flow data ?
Meaux Racing Heads
PipeMax and ET_Analyst for DragRacers