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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: 134769" data-attributes="member: 2907"><p>dlk, who put me on to flexpvc.com where I found the 5-way, urged me to go 1" instead of 1-1/4". He said throttle response would be better. That's counter to what I'd think. The 1-1/4" is very close to the ID of the OEM parts and I'd think the engine would have to pull harder and longer to get what it wants from a smaller diameter. The flip side is the velocity of the mix, it will already be moving faster though the smaller tube and that counts too.</p><p></p><p>Also in this complex set of variables is the engine RPM when you twist the throttle. At what RPM do you want that good response? Is it at idle or already going 4000 cruising down the highway? The intake runner length and diameter can only be optimized for one or the other.</p><p></p><p>Here's the true beauty of this design: it makes it really easy to build and test both in a true A-B way- same bike, carb, road, rider, altitude, and even weather. I can make a 1-1/4" manifold the same way and switch them in literately minutes. It's 5 hose clamps and the carb doesn't even have to be disconnected from the fuel line!</p><p></p><p>I will also get an indoor/outdoor thermometer and check the temperature of the gas inside the runners to see how much the temp drops and make sure the pvc isn't getting too close to the point where it would soften from engine heat. All that will be next season, right now my goal is "running".</p></blockquote><p></p>
[QUOTE="chuck c, post: 134769, member: 2907"] dlk, who put me on to flexpvc.com where I found the 5-way, urged me to go 1" instead of 1-1/4". He said throttle response would be better. That's counter to what I'd think. The 1-1/4" is very close to the ID of the OEM parts and I'd think the engine would have to pull harder and longer to get what it wants from a smaller diameter. The flip side is the velocity of the mix, it will already be moving faster though the smaller tube and that counts too. Also in this complex set of variables is the engine RPM when you twist the throttle. At what RPM do you want that good response? Is it at idle or already going 4000 cruising down the highway? The intake runner length and diameter can only be optimized for one or the other. Here's the true beauty of this design: it makes it really easy to build and test both in a true A-B way- same bike, carb, road, rider, altitude, and even weather. I can make a 1-1/4" manifold the same way and switch them in literately minutes. It's 5 hose clamps and the carb doesn't even have to be disconnected from the fuel line! I will also get an indoor/outdoor thermometer and check the temperature of the gas inside the runners to see how much the temp drops and make sure the pvc isn't getting too close to the point where it would soften from engine heat. All that will be next season, right now my goal is "running". [/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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