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Colonel, that's one heck of a time your posting with the Z28, all motor, that's amazing. Have any times for your Vette?
Agreed that over 100% VE is possible, just very difficult. The intake air charge has mass and velicty, and thus momentum. As the piston travels down in the cylinder, it creates a vacuum which pulls the air charge in through the intake valve. This accelerates the air charge in the port (port velocity). Now you might think that once the piston reaches the BDC that is all she wrote for filling the cylinder, however this is not the case. Some of the air/fuel charge that is still in the port can still flow through the open valve thanks to the momentum of the air slug, and this can actually create a small amount of air compression in the cylinder. This momentum can take your over atmospheric in the cylinder, resulting in greater then 100% VE.
Now obivously you have a pretty wicked and well matched heads/cam combo to achieve this, but it is possible.
im going to have to dissagree with you if you're talking having both the intake and exhaust valves open simultaniously. with 4 cycle motors, you'll never have both I & E valves open at the same time. exhaust scavenging will help pull the exhaust OUT of the cyllinder, making it easier on piston travel in the exhaust stroke.
Vents, in order to get the fresh charge in we obviously have to get the old charge out first. Well, you'll never get %100 of the old charge out but the closer you can get, the more room there is for the fresh charge.
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