Information - Inlet valves

The induction valve is the end point of the intake system. The air-fuel mixture, necessary for the proper functioning of the engine, is pushed through the induction valve into the combustion chamber. A camshaft controls the opening and closing of the induction valve. The structure of the metal of the induction valve (especially the bottom - "the plate") differs significantly from the one of the outlet valve. This is determined by different thermal conditions of functioning.

The power of the engine is directly proportional to the amount of the combustible mixture and fuel that enters the cylinder through the inlet valve, as well as the quality of the cleaning the cylinder from smog through the outlet (exhaust) valves. In order to improve the filling of the engine, the inlet valve diameter is larger than the one of the outlet valve. During descent, the flow speed of the wasted mixture is higher than at the intake of the fresh one, due to the fact that the smog is pushed out by a piston.

The diameter of the inlet valve deals with the possibility of placing it in the cylinder head, and the piston height - with the forces of the valve mechanism performance. But it should not be too large in order to avoid installation of too strong valve springs, because this causes a great deterioration of the cams. The main elements of the valve became the head and the rod. In order to reduce the hydraulic losses during the in- and outlet, the passage from the valve head to the rod is very smooth. Valves are also affected by corrosion. Therefore, the material must always be resistant to wear out, because lubricating it is not satisfying.

If you want to extend the service life, the valve should be exposed to additional processing.

To improve the properties and wear resistance of the valve stem, it needs to be treated with nitrogen or chrome. We always have high-quality induction valves in our online store, as well as outlet valves, axial joints or mirrors, all at very affordable prices.

What you need to know about the intake valve: lifetime limits, common defects and their signs, tips and recommendations

The intake valve has no certain lifetime limit. Component is usually replaced in case of burning-out as a result of local overheating. You may also need a new engine intake valve if the old one was deformed.

Unstable engine work and its lowered power point at defects of the car intake valve. Moreover, extraneous sounds can be heard from the exhaust pipe, and vibration can be felt in the cabin. Another sign of defective component is engine overheating – a corresponding indicator on the dashboard points at it.

You can not diagnose valves breakdown by yourself. Only experienced service station specialists can perform high-quality inspection. They will define if there’s a need to replace the intake valve and if it is, they will install a new car part. One needs experience in engine disassembling to work with this component. Specific preliminary procedures are also required before component installation. Particularly, in order to install the intake valve, you will need to grind the seat where it is located.

Inlet valves at low cost: Top Spares

Inlet Valve (ET ENGINETEAM, VI0005) -19%
Inlet Valve | ET ENGINETEAM VI0005 Article №: VI0005
ET ENGINETEAM Inlet Valve VI0005
£ 4,99
£ 4,04
incl. 20% VAT, Shipping
Over 100 items in stock
  • Length [mm] 112,8
  • Valve stem diameter [mm] 7
  • Valve head diameter [mm] 36,7
  • Valve seat angle [°] 30
  • Material Chrome-silicon-steel
  • Condition  New
Details
Inlet Valve (IPSA, VL139200) -19%
Inlet Valve | IPSA VL139200 Article №: VL139200
IPSA Inlet Valve VL139200
£ 8,99
£ 7,28
incl. 20% VAT, Shipping
Over 100 items in stock
  • Length [mm] 100,9
  • Valve stem diameter [mm] 6
  • Valve head diameter [mm] 29,5
  • Material Chrome-silicon-steel
  • Valve seat angle [°] 45
  • Condition  New
Details
Inlet Valve (FRECCIA, R6013/S) -19%
Inlet Valve | FRECCIA R6013/S Article №: R6013/S
FRECCIA Inlet Valve R6013/S
£ 9,49
£ 7,69
incl. 20% VAT, Shipping
Over 100 items in stock
  • Valve head diameter [mm] 29,5
  • Valve stem diameter [mm] 6
  • Length [mm] 100,9
  • Valve seat angle [°] 45
  • Material Chrome-silicon-steel
  • Connector type I
  • Condition  New
Details
Inlet Valve Hardened valve seat, Valve stem tip hardened (AE, V94608) -19%
Inlet Valve | AE V94608 Article №: V94608
AE Inlet Valve V94608
£ 8,49
£ 6,88
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Over 100 items in stock
  • Length [mm] 100,900
  • Material Chrome-silicon-steel
  • Supplementary Article/Info 2 Hardened valve seat, Valve stem tip hardened
  • Valve head diameter [mm] 33,500
  • Valve stem diameter [mm] 6,000
  • Valve seat angle [°] 45
  • Condition  New
Details
Inlet Valve Hardened valve seat, Valve stem tip hardened (AE, V94116) -19%
Inlet Valve | AE V94116 Article №: V94116
AE Inlet Valve V94116
£ 9,99
£ 8,09
incl. 20% VAT, Shipping
Over 100 items in stock
  • Length [mm] 100,900
  • Material Chrome-silicon-steel
  • Supplementary Article/Info 2 Hardened valve seat, Valve stem tip hardened
  • Valve head diameter [mm] 29,500
  • Valve stem diameter [mm] 6,000
  • Valve seat angle [°] 45
  • Condition  New
Details
Inlet Valve Chromed valve stem, Armoured Valve Seat, Valve stem tip hardened (TRW Engine Component, 111113) -19%
Inlet Valve | TRW Engine Component 111113 Article №: 111113
TRW Engine Component Inlet Valve 111113
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Over 100 items in stock
  • Valve head diameter [mm] 25,9
  • Valve stem diameter [mm] 6
  • Length [mm] 99,9
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  • Supplementary Article/Info 2 Chromed valve stem, Armoured Valve Seat, Valve stem tip hardened
  • Valve seat angle [°] 45
  • Valve Seat Material Chrome-Mangan-Nickel-Niobium Steel
  • Condition  New
Details
Inlet Valve CFFE (FEBI BILSTEIN, 32335) -19%
Inlet Valve | FEBI BILSTEIN 32335 Article №: 32335
FEBI BILSTEIN Inlet Valve 32335
£ 11,49
£ 9,31
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Over 100 items in stock
  • Length [mm] 99,26
  • Notches / Holes Number 3
  • Weight [kg] 0,04
  • Condition  New
Details
Inlet Valve (FRECCIA, R4230/S) -19%
Inlet Valve | FRECCIA R4230/S Article №: R4230/S
FRECCIA Inlet Valve R4230/S
£ 5,49
£ 4,45
incl. 20% VAT, Shipping
Over 100 items in stock
  • Valve head diameter [mm] 36,7
  • Valve stem diameter [mm] 7
  • Length [mm] 112,8
  • Valve seat angle [°] 30
  • Material Chrome-silicon-steel
  • Connector type E
  • Condition  New
Details
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