Non-standard jug and head?

[Hell on Wheels]

Yes intake vacuum duration would be less,and the window cant close because of the boost port being open,and beause the piston is windowed there is no charge trapped between the reed and piston.From bdc as the piston is going up above it is positive pressure that works as a blocker to the open ports until their closed that allows vacuum to be made below the piston before the ports are actually closed through to tdc as the piston starts it down stroke again a positive pressure is made below the piston that closes the reed and pushes the freshly acquired charge up the transfers building pressure until they open as they open the pressure is realeased and the so called boost port opens but now with no pressure behind it as the fresh charge has allready shot into the cylinder via the transfers,so this means that it's only real purpose would be to aid in scavenging where if the velocity of the tail end of exhaust was able to pull open the reed.Witch IMO just makes it more likely to flutter.

But if the window was shortened so it closes before transfer open the gasses in the Reed case can't vent. So this is when a boost port would add charge. So the charge volume is in theory the same, but with higher transfer velocity.

 

[Street Ryderz]

But if the window was shortened so it closes before transfer open the gasses in the Reed case can't vent. So this is when a boost port would add charge. So the charge volume is in theory the same, but with higher transfer velocity.

Ok so on the up stroke as intake vacuum is made that opens and pulls air/fuel through the reed that's it that charge is now in the case and vacuum drops at tdc and changes to positive pressure that now closes the reed and pushes the charge from casr area up the transfers the reed no longer has any affect here because it's being forced closed.With the window it's the same thing as the piston is decending it has possitive pressure below it until the transfers open the windowed piston isn't doing anything until that booster open after the transfers and that means that since above it the cylinder is evacuated and the intake charge is following the ehaust pulse and that so called booster isn't really doing anything.Cylinder reeds have their intake height way up high to get the most intake duration from it they don't call it a booster as theirs are feed from the transfers and are meant to bleed off some of the initail pressure and create a swirl of the charge as it enters to keep more in there.