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Suzuki MX & Off-Road Dirt Bikes
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[QUOTE="Rich Rohrich, post: 1403014, member: 16241"] That's not entirely true. Additional fuel can lower the combustion chamber temps and raise the knock threshold. It's a crude approach but running overly rich can squash knock pretty effectively, but there are obvious tradeoffs. A couple of other things to consider: - it will be harder to jet for good throttle response with alcohol based fuel because ethanol has a fixed boiling point around 173 degrees f and a very high latent heat of vaporization, along with requiring a different A/F ratio then the rest of the fuel. In short it acts very different then pure gasoline and screws up the fuels distillation curve which can cause jetting issues. - the octane distribution of ethanol based fuels will be very different than pure gasoline. As a result the knock sensitivity can be very erratic from load to load of fuel. It's best to tune on the safe side till you get used to running with ethanol. Two-stroke riders who switch to ethanol based fuels without other changes very often run into knock and detonation issues they never had before. As was suggested earlier, modifying the porting and the cylinder head to match the available fuel is the best long term approach. [/QUOTE]
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Dirt Bike Discussions By Brand
Suzuki MX & Off-Road Dirt Bikes
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