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Originally Posted by joespanova
A 2.5 inch collector ? Really ?
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Yes. Although a 2" cone would be better. The concept of coupling restrictions on both the intake (restrictor plate) and exhaust (collector) massively mitigates any gains from trying to work the carb, cylinder heads, etc, because it can't breathe. It's not worth spending money on a no-gain proposition. If you used this method, you wouldn't *need* a spec head. Install the plate and collector on any combination, and go play. Tech is a breeze.
We did extensive computer modeling of this concept, ending up with everything from 350 small blocks to 540 big blocks running within less than a tenth of each other. Some ran the first half of the track better, and some ran the back half better, but it all came out in the wash. You can make weight break adjustments for different transmission types, body styles, or whatever you find out is necessary.
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Bracket racing, for ALL it's participation, has ZERO crowd appeal.
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We had 500+ spectators on Saturday of our American Doorslammer Nationals at Fayetteville in November, because we bothered to pass out a few flyers and only charged $10. Obviously not an overwhelming crowd, but not bad for "just a bracket race", and $150 marketing investment. Motor Mania TV regularly has over 10,000+ viewers watching big money bracket racing online. Anything that's not promoted will have zero appeal. Different types of racing appeals to different crowds. While not every crowd is interested in every market, there is a particular crowd for every market.