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A new way of spec'ing Cams: Speed Spec.
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A new way of spec'ing Cams: Speed Spec.
nissan, PolyQuad, two Valve head, head, David Vizard, engine Builder, low torque Speed, Cylnder Motion, head design, ignition, ffour valve per cylinder, GFN readers, engines, Honda engines, bob, Austec
Written by David Vizard on 11 Jan 2012
  ...continued from: page 6

The cam and valve train recommendations seen in the accompanying charts are not the result of a 'think tank' session a few hours long. Regardless of how inspired that may have been it is far from reality. For just the small block Chevrolet the dyno tests were run on three engines with a number of different heads and pistons to simulate changes in flow and compression. Along with this several other possibly pertinent factors such as rod/stroke ratio, fuel octane etc were also explored. The result was that, over an extended period, over 8000 (eight thousand) combinations were tested in the Vizard dyno shop. This, and Cam Master, a Vizard authored cam prediction program that was over 18 years in the making, gives the custom performance engine builder the most accurate, catalog referenced, cam selection method on the face of the planet. Indeed it is so accurate that it's capability equals or outstrips all but those mega-buck main frame computer predicted valve events. The only program to do a better job than these charts that would be available to a typical commercial engine builder would be Cam Master and the only copy of this is on the Vizard computer (I can be rented, at $200/hour, to run this program and that is typically more than enough time to get the job done way faster, cheaper and more accurately than dyno testing).

So what will these cam charts and cams deliver. First and most obvious is that it will eliminate the time consuming and stressful task of pondering over a conventional cam catalog and wondering if the choice you are about to make is best for the job. The reality here is that, and this may shock you, for the engine building industry in general, as much as 95% of the cams are significantly off the mark. What these cam charts do is to allow you to choose a cam in as little as 15 seconds and then get on with the work that actually pays you – i.e. building engines. Secondly it removes any concerns you may have as to whether or not the engine shop down the road may be able to make a better choice than you.

Consider this. I am read by almost a million performance enthusiasts a month worldwide. My written material, base on personal research, not word of mouth or a third party, is put to the test hundreds, if not thousands of times a day. A reputation for delivering tech that works has successfully survived a potentially incessant onslaught in a hyper critical market place for over 45 years. I am not about to pass on any tech here that I would not be prepared to stake an industry reputation second-to-none on.
If you should have any doubts here just try one of these Lunati/Vizard cams on the dyno. In a world where nothing is for sure I am about 99.9% certain your test engine will pick up a sizable chunk of power.

To run a cam selection click on the tab below. This will cost you nothing other than a few seconds but the potential performance gains are substantial.

David Vizard.

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