Quote:
Originally Posted by blaktopr
John, alot of it depends how the port is shaped. One person's "work" can be different from another. This includes how well the mixture exits the valve depending what is happening upstream. But the air/fuel exits "out" away from the valve. So if it was concentric (no swirl) it will still travel over that ridge. Port bias and valve shrouding lead to the direction you ask. With that, the direction goes from the intake side to the exhaust side, so it can be either direction. To have the charge go in the opposite direction would mean a stronger short side flow over the long side. Looking at newer chambers, you can see the valve/chamber configuration working toward a more even and contolled exit out of the valve. But remember, the charge will still travel away from the valve riding over the ridge. It follows the same situation as the bed of a truck. Throw a plastic bag in there, and go for a ride down the highway and watch what it does.
Here is a pic of a Pro Stock head's chamber done in flourecent dye. Look at the vortex behind the plug away from the valve. That is what happens when air/fuel passes over a ridge or obstruction. Then take a look at one of my vids. http://www.youtube.com/watch?v=MHO0CwIOceY
This is just a cast #62. But note the similarities. |
WOW, the more I read and take interest in cylinder head design and velocity, the more I understand it is very very complicated. You don't just run a dremel down the cylinder and call it a day.
It also gives me a much better appreciation for making power. The r&d that it takes to make power in a "class"( whether pro-stock or stock eliminator) scenario is inconceivable.