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1.8L 16v - B18A1/B1
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1.8L 16v - B18A1/B1
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Set of 8 reinforced exhaust valves for the Honda B18A and B18B.
The B18A and B18B are Honda 1,834 cc four-cylinder engines (81 mm bore, 89 mm stroke) with twin camshafts and 16 valves, without VTEC. From 1989 to 2001 they powered the Integra, the Civic 180i, the Domani and the Orthia.
Their cylinder head carries 8 exhaust valves, two per cylinder. SUPERTECH reproduces them with a 28.0 mm head, a 6.55 mm stem and a 105.8 mm overall length.
On the exhaust side, the head sits in the burnt gases: its metal reaches 760 to 870 °C on a naturally aspirated engine and goes past 1,000 °C with a turbo. About 75 % of that heat leaves through the seat and 20 % through the guide. For the original part, EV8 family steel is the benchmark: 550 MPa at 600 °C, only 300 MPa at 800 °C. Beyond that, the head distorts, fatigues and ends up losing its seal.
Both SUPERTECH valves are black nitrided stainless steel: nitriding hardens the surface and limits stem wear in the guide.
The HEVN-1004-8 enlarges the head by 0.5 mm, to 28.5 mm: the burnt gases flow out more easily and the next intake stroke benefits, provided the exhaust seats are machined to that diameter.
| Part number | Brand | Size | Head Ø OEM 28.0 mm | Stem Ø OEM 6.6 mm | Length OEM 106.0 mm | Grooves | Material |
|---|---|---|---|---|---|---|---|
| HEVN-1004-0-8 | SUPERTECH | Standard | 28.0 mm | 6.55 mm | 105.8 mm | Black nitrided stainless steel | |
| HEVN-1004-8 | SUPERTECH | +0.5 mm | 28.5 mm | 6.55 mm | 105.8 mm | Black nitrided stainless steel |
| Part | Honda original | Reinforced |
|---|---|---|
| Collets | 14781-PL2-004 | |
| Valve stem seals | 12210-PT2-003 / 12211-PT2-003 | |
| Valve guide | 12205-PR4-A01 |
Check that the valve lock groove matches the collets you reuse before refitting the springs.
At 28.0 mm the seats keep their diameter; with the HEVN-1004-8, the 8 exhaust seats are machined to 28.5 mm.
Both part numbers share the same 6.55 mm stem and 105.8 mm overall length: the original guides are fine if they are within tolerance.
 | SUPERTECH Performance, a Californian workshop that has been making racing valvetrain parts for more than thirty years, offers a black nitrided stainless steel exhaust valve for the B18A and B18B, in standard size and +0.5 mm. |
The two versions differ only in head diameter:
| Criterion | Option 1 | Option 2 |
|---|---|---|
| Size | Standard, 28.0 mm Original seats kept. HEVN-1004-0-8. | +0.5 mm, 28.5 mm Better gas flow, seats machined. HEVN-1004-8. |
| Material | Black nitrided stainless steel Same material on both versions. |
| Model | Engine code | Power | Years |
|---|---|---|---|
| Integra 1.8 (DA9) | B18A1 / B18B1 | 131 hp | 1989-1993 |
| Integra 1.8 (DB1) | B18A2 | 140 hp | 1989-1993 |
| Integra Coupé 1.8 (DC2) | B18B1 / B18B2 | 137-146 hp | 1993-2001 |
| Integra 1.8 ESi (DB7) | B18B2 | 145 hp | 1993-2001 |
| Civic IV Shuttle 1.8 (EE7) | B18B6 | 131-140 hp | 1988-1995 |
| Civic V 180i (SR4) | B18B3 | 132 hp | 1994-1996 |
| Civic VI 180i (SO4) | B18B4 | 140 hp | 1996-2000 |
| Domani 1.8 (MA5) | B18B6 | 140 hp | 1992-1997 |
| Orthia 1.8 (EL1 / EY4) | B18B6 | 140 hp | 1995-2001 |
OEM part number (exhaust valve): 14721-PH3-000; 14721-P75-000 (B18B1, 1997-1999)
With a B18A or B18B cylinder head off, it is the right time to replace the inlet valves and the valve stem seals as well.
| B18A B18B inlet valves → |
