Valves And Roller Finger Cam Followers
Exhaust Valves And Roller Finger Cam Followers
| ITEM | DESCRIPTION |
|---|---|
| 1 | Roller finger cam follower (8 off) |
| 2 | Valve spring collets (16 off) |
| 3 | Hydraulic valve tappet (8 off) |
| 4 | Valve spring retainer (8 off) |
| 5 | Valve spring (8 off) |
| 6 | Valve spring seat and valve seam seal (8 off) |
| 7 | Valves (8 off) |
| ITEM | DESCRIPTION |
|---|---|
| 1 | Valve spring collets (16 off) |
| 2 | Valve spring retainer (8 off) |
| 3 | Valve spring (8 off) |
| 4 | Valve spring seat and valve seam seal (8 off) |
| 5 | Valves (8 off) |
The engine uses 16 valves: eight intake and eight exhaust. The intake valves are 30 mm diameter and the exhaust valves are 28 mm diameter. The larger intake valve size will enhance more engine power output at higher Revolutions Per Minute (RPM).
The intake valves are 5.47 and exhaust valve stems are 5.463 mm diameter. These allow reduced flow interruption through the intake and exhaust ports, improving performance and emissions.
The valves are located in conventional, non serviceable valve guides in the cylinder head. A valve stem seal with integral spring seat is located in the cylinder head. The valve spring is retained in a compressed state on the valve stem by a valve spring retainer and a pair of valve spring collets.
The exhaust valves are opened mechanically by the roller finger cam followers which operate directly with roller to camshaft lobe rolling contact. The clearance between the roller and camshaft lobe is compensated with the use of the hydraulic valve tappet. This ensures that all roller finger cam followers are in contact with the camshaft lobes throughout engine operation.
The intake valves are opened by the continuously variable valve lift assembly that is controlled by the Powertrain Control Module (PCM).