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techtalk:evo:carb02 [2020/09/16 05:26] ixl2relax [CV CARBURETOR DESIGN] |
techtalk:evo:carb02 [2020/09/16 05:31] ixl2relax [CV CARBURETOR DESIGN] |
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| To create a proper idle operation, the Idle Port (on the engine side of the throttle plate) has a separate adjustable screw that allows some of the mixture from the Pilot Jet emulsion tube to be bled directly into the manifold, bypassing the throttle plate. | To create a proper idle operation, the Idle Port (on the engine side of the throttle plate) has a separate adjustable screw that allows some of the mixture from the Pilot Jet emulsion tube to be bled directly into the manifold, bypassing the throttle plate. | ||
| - | As the throttle plate is opened, fuel is pulled from the Transfer Jets and eventually, fuel is pulled thru the needle jet in greater quantity as the tapered needle is lifted, by the vacuum-operated slide, out of the needle jet opening. | + | As the throttle plate is opened, fuel is pulled from the Transfer Ports. With more throttle, fuel is pulled thru the needle jet, in greater quantity as the tapered needle is lifted out of the needle jet opening by the vacuum-operated slide. |
| The constant-velocity system provides a partial means of compensating for operation at different altitudes. In a fixed system, as altitude increases, the fuel mixture becomes richer due to the thinner air. But the CV system partially compensates for this fact because the vacuum-slide oparation is also affected by the thinner air, thereby supplying less fuel into the mix. | The constant-velocity system provides a partial means of compensating for operation at different altitudes. In a fixed system, as altitude increases, the fuel mixture becomes richer due to the thinner air. But the CV system partially compensates for this fact because the vacuum-slide oparation is also affected by the thinner air, thereby supplying less fuel into the mix. | ||
