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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
carb sizing formula revisited
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[QUOTE="jaguar, post: 1469235, member: 19340"] Now that I've researched even further I've found it's not as straight-forward as using a set variable formula. Looking at bike specs and figuring out each ones WOT max RPM carb velocity I have "seen the light" and now know that the engineers have been picking flow velocities to match the size engine and type powerband they want. More velocity atomizes the gas better and gives better mid range power so the highest velocities are found on enduro bikes. Lower velocities are found on MX bikes. And the bigger the engine is, the more the engineers favored a higher velocity. So for enduro bikes the typical range is 33-40 meters/second, and for MX bikes 17-33 m/sec. I'm going to try to make a spreadsheet that allows the user to select the variables so the formula will spit out the needed size. Then the user will know to try for something close to that size. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
carb sizing formula revisited
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