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

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

In high performance racing engines in stock cars, a good port starts with a good valve seat, and we demonstrate that bigger power gains result from an effective seat with flow testing - Stock Car Racing Magazine. From the March, 2008 issue of Muscle Mustangs & Fast Fords. Stock-Block 535HP Screamer - D.S.S. 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. Exhaust System Science -by David Vizard. User | Posts: 99 | Joined: 03/12. Written by admin on September 3rd, 2010 The better the head flows the less suction it takes to fill (or nearly fill) the cylinder. Porting heads is an art and science. 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. If the rules allow it, do read full caption. All contributors: David Vizard . Have you read the Popular Hot Rodding "Cylinder Head Porting - Head Porting Basics" Feb 2009 article by David Vizard, or read his porting book? It's Worth Understanding That Any Good Port Starts With A Good Valve Seat. It takes a craftsman's touch to shape the surfaces of the head for the optimal flow characteristics, and hence, the best performance. About the time this Ford head was in the development stage, AFR's founder, the late Ken Sperling, was heavy into swirl and wet flow testing. Easy Steps To Building An Affordable Track-Day Terror. Racing Valve Seats Cylinder Head. Book: David Vizard's How to Port & Flow Test Cylinder Heads (SA Design); Author: David Vizard; Number of pages: 160; Text-book file-size: 4.8 Mb; Audio-book file-size: 96 Mb. This has brought about the curves shown in the graph Fig. From the February, 2009 issue of Stock Car Racing. 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. This was the port flow tested, and the hole seemed not to affect the flow as the numbers delivered were strong.