In mechanical fuel injection systems—common in Sprint Cars, Midgets, and Drag Racing—the "leak-down" percentage of your barrel valve determines your engine's idle quality and throttle response. A barrel valve that is slightly out of sync can lead to a "stumble" on the start or an engine that runs dangerously lean at low RPMs. The Longacre 52-73016 Barrel Valve Setting Tool is the professional’s solution for bench-setting and calibrating fuel flow with laboratory precision.
This tool allows the engine tuner to measure the exact air leakage through the barrel valve at a closed or cracked position. By utilizing this specialized gauge and fitting kit, you can achieve a repeatable "percentage of leak" that ensures your fuel curve starts exactly where it needs to. It eliminates the guesswork of "tuning by ear" and provides the hard data required to win at the highest levels of motorsports.
Key Features
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Precision Leak-Down Monitoring: Designed to provide highly accurate, repeatable readings of the air bypassing the barrel valve spool, allowing for micro-adjustments to the linkage.
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High-Contrast Analog Gauge: Features a clear, easy-to-read face with fine increments, ensuring you can dial in your percentage to within a fraction of a point.
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Universal Fuel System Compatibility: Engineered to work with the most popular mechanical fuel injection brands, including Kinsler, Hilborn, and Enderle.
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Rugged Trackside Durability: Housed in a protective casing with high-quality brass fittings, built to withstand the vibrations and chemicals of a professional pit area.
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Data-Driven Tuning: Allows the crew chief to record a "winning" leak-down percentage and return to that exact setting every time, regardless of weather or altitude changes.
