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2.0L 16v - 4B11T
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2.0L 16v - 4B11T
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Set of 8 reinforced exhaust valves for the Mitsubishi Lancer Evolution X.
The 4B11T is the Mitsubishi 2 litre, 16-valve turbocharged four with an aluminium block, fitted to the Lancer Evolution X (CZ4A) from 2007.
It has 8 original exhaust valves, part number 1011A141, two per cylinder, with a 5.46 mm stem. On a turbo engine that is often remapped, they take increasingly hot burnt gases as boost rises.
On a turbocharged engine, the metal of an exhaust valve head goes beyond 1,000 °C, against 760 to 870 °C naturally aspirated. The head removes about 75 % of its heat through the seat and 20 % through the guide. An EV8 family steel keeps 550 MPa at 600 °C but only 300 MPa at 800 °C: the head cups, fatigues and lets gases leak.
FERREA offers its Competition Plus in Super Alloy, a nickel-based alloy quoted 20 % stronger when hot with a seat life extended by 25 %, and its 6000 series in special alloy, all single groove. SUPERTECH makes its valves in Inconel, a nickel-based superalloy that keeps 860 MPa at 730 °C and 554 MPa at 815 °C, about 85 % more than the reference steel near 800 °C.
At +1 mm oversize the head goes from 29 to 30 mm with no change of stem or length: burnt gases leave faster, with 10 to 12 cfm more flow per millimetre of head, and the 8 exhaust seats are machined to the new diameter.
| Part number | Brand | Size | Head Ø | Stem Ø | Length | Grooves | Material |
|---|---|---|---|---|---|---|---|
| F6292*8 | FERREA | Standard | 29.0 mm | 5.46 mm | 105.9 mm | 1 | Special alloy |
| F2181P*8 | FERREA | Standard | 29.0 mm | 5.46 mm | 105.9 mm | 1 | Super Alloy (nickel base) |
| MEVI-1017-8 | SUPERTECH | Standard | 29.0 mm | 5.46 mm | 105.9 mm | Inconel | |
| F6293*8 | FERREA | +1 mm | 30.0 mm | 5.46 mm | 105.9 mm | 1 | Special alloy |
| F2174P*8 | FERREA | +1 mm | 30.0 mm | 5.46 mm | 105.9 mm | 1 | Super Alloy (nickel base) |
| MEVI-1019-8 | SUPERTECH | +1 mm | 30.0 mm | 5.46 mm | 105.9 mm | Inconel |
F6292, F2181P and MEVI-1017 are standard size; F6293, F2174P and MEVI-1019 are +1 mm. All have a 5.46 mm stem and a 105.9 mm length.
| Part | Mitsubishi original | Reinforced |
|---|---|---|
| Collets | MN183955 | K10091 |
| Valve stem seals | MN183952 | VS1024 |
| Valve guide | 1010A164 | GDE-MEVOX-8 |
The original MN183955 collets are checked on refitting: they must match the groove of the chosen valve.
With a 29 mm head the exhaust seats stay at their factory size; with 30 mm the workshop machines the 8 seats.
FERREA valves have a single groove; the K10091 reinforced collets are intended for this engine.
 | SUPERTECH Performance, in California, has made competition valves and valvetrain parts for more than thirty years. For the 4B11T its exhaust valves are in Inconel, at standard size and +1 mm. |
 | FERREA, founded in 1978, produces its valves in Florida and Argentina. For the Evolution X it offers its Competition Plus in Super Alloy and its 6000 series in special alloy, at standard size and +1 mm. |
Two criteria separate the six versions, size and material:
| Criterion | Option 1 | Option 2 |
|---|---|---|
| Size | Standard, 29 mm Seats kept. F6292*8, F2181P*8, MEVI-1017-8. | +1 mm, 30 mm Seats machined. F6293*8, F2174P*8, MEVI-1019-8. |
| Material | Special alloy FERREA 6000 series, the most affordable version. | Super Alloy or Inconel Preferred with raised boost. FERREA Competition Plus; SUPERTECH. |
| Model | Engine code | Power | Years |
|---|---|---|---|
| Lancer VIII (CZ4A) EVO X | 4B11T | 2007- |
OEM part number (exhaust valve): 1011A141
A 4B11T cylinder head on the bench is the moment to replace the inlet valves and the valve stem seals as well.
