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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
canuckxxxx's Single carb manifold build
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<blockquote data-quote="dan filipi" data-source="post: 103633" data-attributes="member: 54"><p>Canuuk, try what I said about letting the runners and plenum warm up.</p><p>It's important to let the engine warm good so when you shut it off, heat will rise and warm up the plenum.</p><p>If it's left running, the plenum will stay cold because it's the evaporation of the fuel which is keeping it cold. Much like a flame torch on high makes the propane bottle get cold, it's the liquid propane vaporizing that's soaking up heat from the bottle and atmosphere.</p><p>This evaporation process is important because an engine doesn't run on raw fuel, it runs on the vapors. Raw fuel is what your smelling out the exhaust.</p><p></p><p>I've studied and worked with refrigeration quite a lot in my life.</p><p>Boiling points of different liquids can be lowered by reducing the air pressure.</p><p>We reduce air pressure below the throttle plate when it's closed.</p><p>Closed, the boiling point of the raw fuel is lowered.</p><p>Once the throttle is opened, air pressure increases which means the boiling point should also increase.</p><p></p><p>In the case here, I think what's happening (and what I've observed on my bike) is since the air pressure is high with little heat to help evaporation, the fuel is in a raw state so without speeding the air flow with a restrictor in the runners to reduce air pressure on the valve side, (lowering it's boiling point) heat must be added to the assembly (plenum) so once the raw fuel/air mix hits it, it vaporizes. Or as much as possible.</p></blockquote><p></p>
[QUOTE="dan filipi, post: 103633, member: 54"] Canuuk, try what I said about letting the runners and plenum warm up. It's important to let the engine warm good so when you shut it off, heat will rise and warm up the plenum. If it's left running, the plenum will stay cold because it's the evaporation of the fuel which is keeping it cold. Much like a flame torch on high makes the propane bottle get cold, it's the liquid propane vaporizing that's soaking up heat from the bottle and atmosphere. This evaporation process is important because an engine doesn't run on raw fuel, it runs on the vapors. Raw fuel is what your smelling out the exhaust. I've studied and worked with refrigeration quite a lot in my life. Boiling points of different liquids can be lowered by reducing the air pressure. We reduce air pressure below the throttle plate when it's closed. Closed, the boiling point of the raw fuel is lowered. Once the throttle is opened, air pressure increases which means the boiling point should also increase. In the case here, I think what's happening (and what I've observed on my bike) is since the air pressure is high with little heat to help evaporation, the fuel is in a raw state so without speeding the air flow with a restrictor in the runners to reduce air pressure on the valve side, (lowering it's boiling point) heat must be added to the assembly (plenum) so once the raw fuel/air mix hits it, it vaporizes. Or as much as possible. [/QUOTE]
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Engine & Fuel System Modifications
canuckxxxx's Single carb manifold build
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