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Wastegate Engineering Valve

Valve-to-valveguide binding is not an issue with the Synchronic wastegate since there is no valveguide or metal-to-metal contact. The valve remains centered in its bore by the piston attached to its other end. Pressure is equally exerted on the piston, which keeps the valve centered properly.
Rethinking The Wastegate - Synchronic Wastegates

 Valve-to-valveguide binding is not an issue with the Synchronic wastegate since there is no valveguide or metal-to-metal contact. The valve remains centered in its bore by the piston attached to its other end. Pressure is equally exerted on the piston, which keeps the valve centered properly.  View Related Article

 

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