Upward-Facing Fuel Jets for Rapid Carburetor Maintenance

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Solution Overview

Problem

Existing carburetors require draining the float bowl and physically removing it to change fuel jets, posing safety hazards and wasting time, especially in racing applications where rapid adjustments are necessary.

Innovation Solution

The carburetor design includes an upwardly facing bore in the float bowl with internally threaded holes to allow safe and rapid removal and replacement of fuel jets without draining the float bowl, ensuring the jets remain covered with fuel and are not affected by acceleration or deceleration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the float bowl is physically removed to change fuel jets, then access to the jets is obtained, but fuel spills onto the engine creating a fire hazard and time is lost

Engineering Contradiction:

ImproveAccess to fuel jetsVSAvoidFuel spill fire hazard

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The invention divides the float bowl into two parts: a removable upper portion and a fixed lower portion. The upper portion can be detached to provide direct access to the fuel jets for quick changes, while the lower portion remains attached to the carburetor body, preventing fuel spills and eliminating the fire hazard associated with complete float bowl removal.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the float bowl is removed to change jets, then jet access is enabled, but the gasket is damaged and must be replaced

Engineering Contradiction:

ImproveJet accessibilityVSAvoidGasket replacement requirement

Core Design Contradiction:

Ease of operationVSEase of repair

Solution Approach 1:

The float bowl is segmented into removable and fixed portions, allowing jet access without complete disassembly. The gasket is strategically positioned to seal only the fixed lower portion to the carburetor body, while the removable upper portion has its own separate sealing mechanism or interfaces, enabling jet changes without disturbing the main gasket.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If jets are located parallel to braking and acceleration axis, then factory installation is simple, but jets become uncovered by fuel causing engine starvation

Engineering Contradiction:

ImproveJet installationVSAvoidFuel coverage consistency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Instead of positioning jets parallel to the braking and acceleration axis (horizontal orientation), the invention inverts the orientation by positioning jets perpendicular to this axis (vertical orientation). This inversion ensures that fuel in the float bowl consistently covers the jet orifices regardless of vehicle acceleration, deceleration, or cornering, preventing fuel starvation while maintaining simple factory installation procedures.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS7398962B2Quick jet change fuel float bowl

Publication Date: 2008.07.15 COOPER PATRICK

AI summary

Replacement of the fuel metering jets of an internal combustion engine carburetor, such as a Holley.RTM. or Demon.RTM. Carburetor is greatly simplified by fuel float bowls which permit the jets to face upward. The jets are removed through access holes in the upper wall of the float bowl by a screwdriver/gripping tool. The float has access holes which are aligned to the upper wall holes to provide direct access to the fuel metering jets.