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Old 04-26-2013, 08:34 PM
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Originally Posted by ap72 View Post
I already have given you a much better alternative many times. And that is picking one based on application. Displacement, target use, and induction and exhaust are ALL more important than compression.

DCR means what exactly? It's a fancy way of renaming cranking compression. Hell your target DCR is again dependent on loading and fuel so any "target DCR" is void as soon as I suggest changing fuels, cylinder heads, or in some borderline cases even induction and exhaust.

DCR is a RESULT that can be checked to help provide assurance- it is NOT the starting point.

I know you attempted to simplify things, but you not only over-simplified it but also used one of the worst metrics as a scale. A more common set of metrics would be RPM and displacement which is more accurate than your approach but still leaves a lot of room for problems.

The plain and simple truth is that you CANNOT simplify cam selection by that much and still claim to have valid results.

From what I understand your "research" came from the cam catalog of Comp, you gathered your results by selecting the target static compression ratio listed in the cam descriptions. You also chose to throw away anything they listed about RPM, induction, exhaust, usage, etc. Interesting that your argument is that their recommendations are to be trusted because of their experience yet you started by throwing away 80% of what they recommended as you deemed it irrelevant.

My "alternative" is to simply use the traditional methods of cam selection and throw away this silly idea that there is a singular trend that can be followed in cam selection, especially a trend based on such an irrelevant parameter.

DCR is a CHECK, not a target.
Mark Twain said it best.....
"Never argue with a fool; onlookers may not be able to tell the difference"
I'm very tired of trying to make sense to you. You've been on this forum long enough to have learned something useful, but all of it seems to have avoided you.

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