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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Eric: port time-area formula?
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[QUOTE="helio lucas, post: 1407998, member: 78346"] eric gorr recomendations are for mx bikes, not for a chainsaw engine. totally different beast... time-area and angle-area have been here long ago. and yes, it´s widely referenced... gordon jennings was a guru at his time, his writings where great, still they are. but, time has changed, new technologies evolved etc... his principles are still right but things are different now. even a industrial engine like yours will accept a very wide exhaust port, what in that time was called "race only" or "high wear spec". his formula to calculate time-area is crude but may still give you a good ballpark figure. the concept of time area is very easy to understand. and the 170$ book is really the two stroke bibble, a compilation of loads of sae papers. i will give you this link again: [url]http://www.dirtrider.net/forums3/showthread.php?t=180270[/url] check rich´s posts. every one, they are super informative... [/QUOTE]
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MX, SX & Off-Road Discussions
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Eric: port time-area formula?
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