I don't believe a TP smaller than 3.0mm ever works in a 12FP springer....

[cooper_dan]

My bachelor's and master's dissertation were based around fluid dynamics, simulation and modelling. One on IC cylinder head flow and one on external aerodynamics. Can be very interesting, but when it comes to transfer ports I would just stick with physical testing. Too many variables and life is too short

[TonyL]

I have three formulae for transfer port diameter, and they never agree with each other

There's too many unknowns to make such calculations reliable.

My bachelor's and master's dissertation were based around fluid dynamics, simulation and modelling. One on IC cylinder head flow and one on external aerodynamics. Can be very interesting, but when it comes to transfer ports I would just stick with physical testing. Too many variables and life is too short

Yes, this.