Don Terrill’s Speed-Talk

Just to add a little more information and background about this software. David has attended Harvey Crane's Cam School. During an extended period of time (over 6 months) he ran 1000's of dyno tests to evaluate cam / engine combinations for Crane Cams. I have spoken with David in the past 6 month about this program and the possibility of him restarting this service.

Stan

1. No question - for the average use SBC/SBF/BBC, David Vizard is a good as anyone alive on cam selection. He does know his stuff, no argument.

2. When first introduced, the DynoSim software was a breakthrough for home/low-budget shops. For the first time, anyone could get basic, clear graphic and tabular representations of what one change would do to the power curve. It is amazingly accurate at estimating HP/TQ of what it is given.
a. GIGO (garbage in, garbage out) The key is entering accurate airflow data. Most everyone overestimates the head flow data.
b. The DynoSim program has a cam design function which will take the existing HP peak and design a cam which will maximize the HP at that same RPM. Again, works pretty well.

3. The CamQuest file is a separate program within DynoSim which will pick the best CompCams catalog cam for a given application.

4. Even for Studebaker and Packard V8s, the DynoSim has taught me a lot. They're all air pumps. I just have to supply a lot more of my own data, where you belly-button builders can call up existing files.

jack vines

Stan Weiss wrote:Just to add a little more information and background about this software. David has attended Harvey Crane's Cam School. During an extended period of time (over 6 months) he ran 1000's of dyno tests to evaluate cam / engine combinations for Crane Cams. I have spoken with David in the past 6 month about this program and the possibility of him restarting this service.

Stan

When I spoke with David over the weekend, I revisited this question with him.

David will for a fee ($100) spec the best cam for your application.

Yes I know that I have not included any contact information for David. David is very busy and he believes that only serious people will take the time to find his contact information.

Stan

Attached is the cam sheet for high intensity flat hydraulic cams and is posted here with the permission of David Vizard. Note how the cam used is specific to the displacement, valve size and compression ratio. This one sheet replaces a number of pages in a regular cam catalog and totally removes the typical ambiguity when choosing a cam from such a catalog. Using David's method gets the right cam for the job in 15 seconds flat for anyone with an IQ of 100 that can read. No cam speccing experience is require to get results as good as they get. Remember David is a guy who has yet to loose a cam shootout. Checkout this article in PHR magazine. http://www.popularhotrodding.com/engine ... index.html

Stan

Please tell me that's not suggesting a 104 LSA for a 434ci towing engine.

CamKing wrote:Please tell me that's not suggesting a 104 LSA for a 434ci towing engine.

What would be the disadvantage with such a short duration?

You think you know about cams - check this out - or you want to learn more about how David selects and designs cams by listening and talking with David at his How To Build Horsepower Seminar by David Vizard.

http://www.youtube.com/watch?v=Y_6qBG3XknM

Stan

OK What is 128 about?

Is it the number of pages in the book?

David's Response

"It has cost me a lot of time and money to produce the technology that the 128 number is applicable too. That's why I charge for my articles, books and lectures. I think I make new and ground breaking tech available at practical prices instead of tens of thousands of $ prices. Anybody that wants to come along to my UNWO lecture will move instantly into the 21st century as far as accurate cam speccing is concerned and that's a money back guarantee. Seminar details are at www.davidvizardseminars.com

BTW one leading and highly respected cam designer/grinders in Australia/New Zealand attended my 'Pro Engine Builders only' lecture in New Zealand this past March. ($650 for 8 hours and I got a 100% satisfaction score from the attendees and we all know how cranky and critical pro engine builders can be!)) He confided in me that with the knowledge of how to manipulate that 128 # he learned more about cam speccing in 30 minutes than he had in the previous thirty years. (and this guys cams have won an awful lot of races down under)"
DV

Is it explained in the book?

I've got his latest book coming, I will look for this magic number.

Lots of great new info in the book (I assume you mean the new edition of How to Build Horse Power?), but the explanation of "128" isn't part of it.

I just bought the book as well. Haven't read the whole thing yet, but have been through the chapters on cams and cam selection a couple of times. No mention of the "128" term. There is some very helpful info though. Well worth the money. I'd love to know what the 128 term refers to, but the seminar is a little out of my price range right now.

Stan Weiss,
You have a PM.

Marty