Component Overview

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In the Turbo, the exhaust valve is fitted with internal and external valve springs (set of valve springs) and adapted concave washers. The exhaust valve in the turbo engine has the same outer dimensions as the exhaust valve of the naturally aspirated engine. However, because of the sodium filling, the exhaust valve in the turbo engine is lighter and the shank over the shank entries is longer. For further details, please see Figures Fig 1 and TABLE entitled "Valve dimensions" .

Fig 1: Identifying Valve Components

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Intake Valve (Identical In The Naturally Aspirated And Turbo Engines)
Valve-Seat Ring Intake
Valve Guide
Lower Valve-Spring Plate Intake
Valve Stem Seal
Set Of Valve Springs, Intake (Identical In The Naturally Aspirated And Turbo Engines)
Upper Valve-Spring Plate Intake
Valve Collet
Upper Valve-Spring Plate Outlet (Different In The Naturally Aspirated And Turbo Engines)
Set Of Valve Springs (Turbo Outlet); Valve Spring (Naturally Aspirated Engine Outlet)
Lower Valve-Spring Plate Outlet (Different In The Naturally Aspirated And Turbo Engines)
Valve-Seat Ring Outlet
Exhaust Valve (Different In The Naturally Aspirated And Turbo Engines)

Distinguishing features of exhaust valve on naturally aspirated and turbo engine

Exhaust Valve - Naturally Aspirated Engine
Exhaust Valve - Turbo Engine
Difference In Shank Length Over Shank Entries

Fig 2: Identifying Difference Between Exhaust Valve On Naturally Aspirated And Turbo Engine
Courtesy of PORSCHE CARS NORTH AMERICA, INC.