Injector Sizing: REALLY dumb question -Reply

[Greg Hermann]

>Just butting in here with my two cents worth...
>
>I thought the whole idea of having the timing overlap was to take
>advantage of the momentum of the exhaust gas passing from the
>combusion chamber into the exhaust port to "scavenge" some intake
>charge. The momentum of the gas is such that once the piston reaches
>TDC it tries to keep going  hence creating a depression if the inlet valve
>were not opening. Because the inlet valve opens the depression is
>satisfied by sucking in some fresh charge. If the overlap was too large,
>and the inlet opened way too soon then I suppose the exhaust gas into
>the inlet would be possible - but doesn't sound too flash to me!
>
>Bruce.

As I said before, the headers, while still hot, belong wrapped around the
nedk of the cam grinder if this is going on the way Gary is trying to
portray it.. It is not, repeat NOT a static, or even a steady state dynamic
situation.
Greg