By David Vizard
Writer Vizard covers mixing the bowls, simple porting methods, in addition to pocket porting, porting the consumption runners, and plenty of complicated methods. complex strategies comprise unshrouding valves and constructing the fitting port sector and attitude.
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Additional resources for David Vizard's How to Port & Flow Test Cylinder Heads
020 inch for solids. 050 inch. What this means is that the form of the valve seat plays a dominant role for more than half the valve lift involved, and it does this twice during the open/close cycle. The only conclusion that can be drawn here is that the valve seat form is of great importance to the overall success of the port—intake or exhaust. In practice, the flow bench and dyno prove this to be the case. Do You Need a Flow Bench? So, I have already introduced a degree of complexity that you may not have thought of.
I was moving within a very substantial performance community. Some of the folks I worked with were very smart and some… well, not quite so. Almost all of the companies and people I dealt with had at least a working knowledge of the worth of a flow bench. Here, I was going fairly much with the flow instead of against it. About the time I saw my first in-cylinder pressure diagram (about 1978) is when I realized that measuring the flow at a fixed pressure drop as with a BSI-type flow bench (which most are) was absolutely not the best way to do things.
When it came to test pressures/vacuums, it was each to its own. But then along came the ever-innovative hot rodder Henry “Smokey” Yunick. Smokey was not only something of a rascal (and, in performance-automotive circles, a famed one at that), but a rascal who was always pushing boundaries when it came to making power from piston engines. I knew Smokey personally, but since his passing in 2001, I wish I had taken advantage of numerous opportunities to spend more time with him. Smokey was one of the great performance-engine innovators of the later part of the twentieth century.
David Vizard's How to Port & Flow Test Cylinder Heads by David Vizard