Valves And Roller Finger Cam Followers
Exhaust Valves And Roller Finger Cam Followers
| ITEM | DESCRIPTION |
|---|---|
| 1 | Roller finger cam follower (quantity 8) |
| 2 | Valve spring collets (quantity 16) |
| 3 | Hydraulic valve tappet (quantity 8) |
| 4 | Valve spring retainer (quantity 8) |
| 5 | Valve spring (quantity 8) |
| 6 | Valve spring seat and valve stem seal (quantity 8) |
| 7 | Exhaust valve (quantity 8) |
Intake Valves
| ITEM | DESCRIPTION |
|---|---|
| 1 | Valve spring collets (quantity 16) |
| 2 | Valve spring retainer (quantity 8) |
| 3 | Valve spring (quantity 8) |
| 4 | Valve spring seat and valve stem seal (quantity 8) |
| 5 | Intake valve (quantity 8) |
The engine uses 16 chrome plated steel valves, 8 intake and 8 exhaust valves.
| INTAKE VALVE | EXHAUST VALVE | |
|---|---|---|
| Number per cylinder | 2 | 2 |
| Number in the cylinder head | 8 | 8 |
| Valve head diameter | 30 mm (1.18 in) | 28 mm (1.1 in) |
| Valve stem diameter | 5.47 mm (0.2154 in) | 5.463 mm (0.2151 in) |
The larger intake valve size provides better intake air flow into the combustion chamber, which enhance more engine power output at higher RPM . The intake and exhaust valve stems are 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 makes sure that all roller finger cam followers are in contact with the camshaft lobes throughout engine operation.
The intake valves are opened by the CVVL assembly that is controlled by the PCM .