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David Vizard
David Vizard

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

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



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

David Vizard's How to Port & Flow Test Cylinder Heads David Vizard ebook
Page: 160
Publisher: CarTech, Incorporated
ISBN: 9781934709641
Format: pdf


It takes a craftsman's touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. All the modifications in the tests shown were performed by the author of this article, and cylinder head flow expert David Vizard, at Vizard's flow research facility. We'll show you how, but you'll need to leave those old myths at the door. In order to understand the impact of intake port volume on performance, the folks at Dart Machinery tracked down engine guru, David Vizard, and asked him to write up the results of his testing on the topic. Porting heads is an art and science. 3 of 3 people found the following review helpful. It is called “How to Port and Flow Test Cylinder Heads”, and please, don't buy it either! Exhaust System Science -by David Vizard. Photography by David Vizard, Johnny Hunkins But having the greatest flowing heads counts for zero if the valves are not opened sufficiently or at the right time in relation to the crankshaft's rotation, and that very important function falls to the camshaft. Porting demands the right tools, skills, and application of knowledge. #1 David Vizard's How to Port & Flow Test Cylinder Heads (SA Design). Written by admin on September 3rd, 2010 The better the head flows the less suction it takes to fill (or nearly fill) the cylinder. This has brought about the curves shown in the graph Fig. Cylinder head porting is not for everyone. From the February, 2009 issue of Popular Hot Rodding. Save up to 5-30% Off or More and FREE Shipping on orders over 25US. IOf you Using Dart Platimun Pro cylinder heads with four different intake port volumes ranging from 180 to 230 cc, he compared the flow rates achieved at different valve lifts and found vurtually no difference amoing the four, until lift passed the 0.400-inch mark. For a highly developed two-valve race engine the pressure difference between From this premise it has been possible to develop a simple correlation between exhaust port-flow bench tests and dyno tests involving pipe diameter changes.

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