Download David Vizard's How to Port & Flow Test Cylinder Heads by David Vizard PDF

By David Vizard

Writer Vizard covers mixing the bowls, simple porting techniques, in addition to pocket porting, porting the consumption runners, and plenty of complex techniques. complicated tactics contain unshrouding valves and constructing the proper port quarter and attitude.

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David Vizard's How to Port & Flow Test Cylinder Heads

Writer Vizard covers mixing the bowls, uncomplicated porting methods, in addition to pocket porting, porting the consumption runners, and plenty of complex tactics. complex techniques contain unshrouding valves and constructing the appropriate port sector and attitude.

Extra info for David Vizard's How to Port & Flow Test Cylinder Heads

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3 shows where in the valve opening events the overlap occurs. 4 shows the overlap period on a typical card as issued with the cam when purchased from the cam manufacturer. In this diagram, we can easily see the shared time (overlap), in terms of degrees, that the intake and exhaust are both open. What is not apparent from such a diagram is how far off the seats the valves are. 5. 060 above the lash point. 096 inch. That is close to 1/10 inch, and here we are considering nothing more than a fairly hot street cam.

The first engine he tested for power output was in 1960 using a hill with a constant gradient as the retarding force. This gave the output at one particular RPM that happened to be near peak. The following attempts to measure his engine’s output were by means of a homemade accelerometer and a lot of math. His first chassis dyno test was in 1963 and his first engine dyno test was in 1964. To date he has run well over 500,000 dyno tests, most using the latest high-tech dynos of the day. Currently most of his dyno work is on a 2000 Dynamic Test Systems’ hybrid.

Of those eight, five powered the drivers to national championship wins. On four occasions his engines or engines built to his specs have won four championships by winning every race in the series contended. Four different times he has entered a race series with vehicles he was unfamiliar with at the start of the season. In each case by less than halfway through the season his car was not just competitive but truly dominant. As an inventor David has been responsible for numerous patents. At last count this was about 40 but the number of his patentable designs is probably five times that.

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