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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Crankcase volume effects on power
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[QUOTE="WWR, post: 691906, member: 19191"] I know this question has been asked before, but I cant seem to find the thread. Some performance shops claim great advantages to "stuffing" the crank with epoxy to reduce crankcase volume. How does this usually effect the power? Does it just effect throttle response, low end, or top end in any way? This question is being asked in my unending attempt to build the "ultimate NSR engine". Since I am installing a new crank in my project engine, I will be able to do the full treatment to the cases. I have gasket-matched the mating surfaces where the cylinders meet, and rounded the sharp corners that follow the air-flow path to the cylinders. Would adding a little epoxy be worth it? What is the best type to use? What about durability issues? Also, the jugs are currently being bored 2mm over by Eric. This in itself will create a greater primary compression ratio. Is there anything in particular to do to the bottom end that will correspond with this well for power enhancement? The engine will be 266cc, 133cc per cylinder, and have a tuned peak of 11,200rpm. The pipes are made by Tyga Performance, tuned for the same peak. I hope to attend Dirtweek '04, and this bike will be attending with me... :) [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Crankcase volume effects on power
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