[mwebb]

thanks for the info provided so far .
now i have a lot of reading and studying to do ....

but .....
i believe
i have the ability to measure relative VE and it is going to be very much less than 100% at partial load .

my SWAG is
using calibrated pressure transducer threaded into a spark plug thread
and a scope NOT a gauge .

i can measure actual running compression PEAK compression pressure at WOT snap OR
cranking the starter , plugs out , throttle at WOT .

if i assign that a value of 100% ( actual value will be a little less than 100% )

then measure actual running compression at 2500 to 3k rpm

since i know or can determine ,
cylinder volume and compression ratio .

i should be able to calculate
the difference from WOT and Partial load
running compression measured peak pressure
and assign that value as
a multiplier
to determine ACTUAL flow at a the RPM
(which i measure the partial load running compression pressure at)
would then
be
the sought after approximate PRIMARY tube volume value as well ?

for optimum exhaust scavenging AT a chosen by myself partial load

does that make sense ?