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Dirt Bike Brands - Other
235psi and 99 octane not cutting it...
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[QUOTE="Rich Rohrich, post: 989510, member: 16241"] There are a number of ways to modify the cylinder head to increase compression and/or alter the squish characteristics. The squish characteristics can be altered while retaining the original compression ratio through reshaping of the bowl area. It's a balancing act based on what you are trying to accomplish. Too much squish clearance renders the squish band essentially useless and will tend to [b]increase[/b] the octane requirement in most cases. Too little squish clearance can complicate things as well. As Andrew pointed out, good measurements are the correct starting point to work from. One other thing to consider is that not all 99 octane fuels are the same. A 99 octane fuel designed for high speed four-strokes could easily run into knock issues sooner than a 95 octane fuel specifically designed for use in a two-stroke. The 90% distillation temperature and the end point temperature are important considerations in choosing a proper fuel for a high compression two-stroke. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
235psi and 99 octane not cutting it...
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