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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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<blockquote data-quote="joedrum" data-source="post: 104227" data-attributes="member: 98"><p>Okay I am going to switch gears a bit and talk manifold. My belief here as it pertains to oldwings and their smaller displacement than this carb is made to supply. On the stock carb set up, the carbs are close to the intake runner inside each carb it narrows down to 1"ID where the atomizing takes place. It is also really very close to intake valve. Only a 180 degree sweep from combustion chamber. But it's not right on top of the head. When a carb gets too close it is in the a lot turbulence from the stroke of the piston volume. It really makes it tough for the carb to make consistent fuel charge from the all the trauma the carb right in the middle of it. Same is true when to far away. Except the carb suffers from not enough effect on it to atomize consistent fuel charge. So there is a sweet spot where the carb is in perfect tune with motor. Is this adjustable ??? Yes it is. It's like jetting the carb right to get it to work good. With the "oldwing motor and the idea of one central located carb as compared to stock set up is about 2 easy and maybe three times further away from piston.</p><p></p><p>It is not good to think this don't matter but it does the farther away from piston you go the less and less suction you get. More coming.</p></blockquote><p></p>
[QUOTE="joedrum, post: 104227, member: 98"] Okay I am going to switch gears a bit and talk manifold. My belief here as it pertains to oldwings and their smaller displacement than this carb is made to supply. On the stock carb set up, the carbs are close to the intake runner inside each carb it narrows down to 1"ID where the atomizing takes place. It is also really very close to intake valve. Only a 180 degree sweep from combustion chamber. But it's not right on top of the head. When a carb gets too close it is in the a lot turbulence from the stroke of the piston volume. It really makes it tough for the carb to make consistent fuel charge from the all the trauma the carb right in the middle of it. Same is true when to far away. Except the carb suffers from not enough effect on it to atomize consistent fuel charge. So there is a sweet spot where the carb is in perfect tune with motor. Is this adjustable ??? Yes it is. It's like jetting the carb right to get it to work good. With the "oldwing motor and the idea of one central located carb as compared to stock set up is about 2 easy and maybe three times further away from piston. It is not good to think this don't matter but it does the farther away from piston you go the less and less suction you get. More coming. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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