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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
the PVC manifold didn't go so well so now I'm making one from copper plumbing parts
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<blockquote data-quote="chuck c" data-source="post: 134995" data-attributes="member: 2907"><p>I'm already toying with the next design. I was thinking about the lack of a plenum and no reserve of mix ready to go on a quick demand. So if I used a large diameter tube in the center and branched straight 1" runners from it, it would hold that reserve. That design has been done but I can't imagine it having smooth, equal flow. How could I solve that? Like this:</p><p>[ATTACH=full]10257[/ATTACH]</p><p>[ATTACH=full]10258[/ATTACH]</p><p>The runners and tube from the carb are tangent to the ID of the 3" tube. This <s>will</s> <s>should</s> might cause the mix to spin in that plenum, helping it mix and it's still able to make a smooth direction change into the runners. In that cross section the mix will be spinning clockwise. The smaller tube in the middle is to keep the mix against the wall and discourage it from taking a shorter path. What do you think? They have clear PVC in some sizes. I could get some and hook up a shop vac to a runner to see if it will do what I think.</p><p></p><p>I ran some numbers. Each cylinder is 275cc and these runners have a volume just about half that. The 3" plenum will hold about 500-600cc.</p><p></p><p>It also hit me that leaves a lot of unburned but very ready to ignite mix in the manifold when the engine is turned off. Not sure I like that. But the Solex is perfect because the anti-diesling fuel shut off can be tied to the ignition and shut of when it does. The engine would purge itself of remaining mix as it coasted to a stop.</p></blockquote><p></p>
[QUOTE="chuck c, post: 134995, member: 2907"] I'm already toying with the next design. I was thinking about the lack of a plenum and no reserve of mix ready to go on a quick demand. So if I used a large diameter tube in the center and branched straight 1" runners from it, it would hold that reserve. That design has been done but I can't imagine it having smooth, equal flow. How could I solve that? Like this: [ATTACH type="full" alt="PVC MANIFOLD 4top.JPG"]10257._xfImport[/ATTACH] [ATTACH type="full" alt="PVC MANIFOLD 4.JPG"]10258._xfImport[/ATTACH] The runners and tube from the carb are tangent to the ID of the 3" tube. This [s]will[/s] [s]should[/s] might cause the mix to spin in that plenum, helping it mix and it's still able to make a smooth direction change into the runners. In that cross section the mix will be spinning clockwise. The smaller tube in the middle is to keep the mix against the wall and discourage it from taking a shorter path. What do you think? They have clear PVC in some sizes. I could get some and hook up a shop vac to a runner to see if it will do what I think. I ran some numbers. Each cylinder is 275cc and these runners have a volume just about half that. The 3" plenum will hold about 500-600cc. It also hit me that leaves a lot of unburned but very ready to ignite mix in the manifold when the engine is turned off. Not sure I like that. But the Solex is perfect because the anti-diesling fuel shut off can be tied to the ignition and shut of when it does. The engine would purge itself of remaining mix as it coasted to a stop. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
the PVC manifold didn't go so well so now I'm making one from copper plumbing parts
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