Four Door-Power Valves

The standard by which all other power valves are measured QFT® exclusive in-house design has become the power valve of preference by professional race teams in virtually every circuit where carburetors are used. Not only does the FOUR DOOR™ power valve have a much greater flow capacity (vital for alcohol applications), but a quicker response rate and tighter limit bands allow engine builders to precisely tune the power enrichment phase of their calibration. Each FOUR DOOR™ power valve is hand tested and set to the stamped value. The thicker molded diaphragm adds increased protection against backfire induced rupture and corrosive fuels (such as alcohol / E85) No one offers a broader selection of opening values than QFT®. This power valve design is covered by patent B 65204BBB1.