The Honda B18B1 is the naturally aspirated, non-VTEC version of Honda's B18 family- the 1.8-liter DOHC four-cylinder that powered the Acura Integra LS, RS, GS, and SE from 1994 through 2001. It replaced the earlier B18A1 with revised fuel injector angles, updated camshaft profiles, and a recalibrated ECU, producing 142 hp at 6,300 rpm and 127 lb-ft of torque at 5,200 rpm. In the B-series family hierarchy, the B18B1 sits between the B16A and the VTEC B18C engines- it produces more displacement and torque than the B16 while remaining simpler and more tractable than the VTEC-equipped GSR and Type R engines.
The B18B1 is notable for two distinct roles in the Honda community. First, as a direct replacement engine for any 1994 to 2001 Acura Integra LS, RS, GS, or SE. Second- and arguably more significant in terms of market demand- as the foundation for the LS/VTEC build. The LS/VTEC swap grafts a VTEC cylinder head from a B16A, B18C1, or B18C5 engine onto the B18B1 block, combining the B18B1's larger displacement and torque characteristics with VTEC's high-RPM breathing capability. The result is often called the most cost-effective high-performance B-series build available, producing 200 to 300+ horsepower in various states of tune.
The B18B1 came in two OBD generations: OBD1 (1994 to 1995) and OBD2 (1996 to 2001). These are not directly interchangeable without wiring harness and ECU conversion work. The OBD1 B18B1 uses the PR4 ECU and is simpler to tune. The OBD2 B18B1 uses the P75 ECU and has more advanced emissions controls. We confirm the OBD generation before every order.
The B18B1 is one of several B18 variants. Understanding the family prevents sourcing errors:
| Engine | Years (USDM) | HP | VTEC | Notes |
|---|---|---|---|---|
| B18A1 | 1990 to 1993 | 130 to 140 hp | No | Earlier Integra LS/GS. Similar to B18B1 but different ECU, smaller input shaft transmission. Not a B18B1 replacement. |
| B18B1 | 1994 to 2001 | 142 hp | No | This engine. OBD1 (94-95) or OBD2 (96-01). The LS/VTEC swap base engine. Larger input shaft than B18A1. |
| B18C1 | 1994 to 2001 | 170 hp | Yes (4,400 rpm) | Integra GSR. VTEC head. Different head casting- provides VTEC hardware. |
| B18C5 | 1997 to 2001 | 195 hp | Yes (5,700 rpm) | Integra Type R (ITR). Highest output B18. Race-derived cam profiles. Red valve cover. |
| INCLUDED- Long Block | Aluminum block with iron liners, crankshaft, pistons, connecting rods, dual camshafts, aluminum DOHC non-VTEC cylinder head, valve train, oil pan, timing cover. |
|---|---|
| NOT INCLUDED | Timing belt and tensioner (replace at installation- mandatory), intake manifold, throttle body, distributor and ignition system, alternator, power steering pump, A/C compressor, ECU and wiring harness, axle shafts. |
| TIMING BELT | The B18B1 uses a rubber timing belt on an interference engine (post-1996). ALWAYS replace at installation regardless of apparent condition. |
| Core Note | No core charge. You are not required to return your old engine. |
The Honda B18B1 was factory installed in the following vehicles:
| Acura Integra RS | 1994 to 2001- all body styles |
|---|---|
| Acura Integra LS | 1994 to 2001- all body styles |
| Acura Integra GS | 1994 to 2001- all body styles |
| Acura Integra SE | 1994 to 2001 |
| Swap Applications- Honda Civic and CRX | B18B1 is a well-documented swap into 1988 to 2000 Civic and CRX chassis using B-series swap mounts and conversion harness |
| LS/VTEC Build | The B18B1 block is the specific foundation for LS/VTEC builds where a VTEC head is grafted onto this block |
The B18B1 is the most popular B-series swap engine in the Honda community. It fits directly into any Civic or CRX chassis with B-series swap mounts (Hasport, Innovative, or Energy Suspension) and the appropriate OBD conversion wiring harness. For OBD2 Civics, a B18B1 OBD2 engine is the direct swap match. For earlier OBD1 Civics (1992 to 1995), the OBD1 B18B1 is preferred. Call (240) 301-0095 with your chassis year and we will confirm the correct variant.
Transmission compatibility: YS1 5-speed manual with larger input shaft- standard Integra LS transmission | Also compatible with all 1992 to 2001 B-series transmissions. The B18B1 transmission uses a larger diameter input shaft than the B18A1- important distinction for swap buyers.
Not sure if this fits? Call (240) 301-0095. We verify fitment before every order ships.
| B18B1 | Most common buyer search code |
|---|---|
| Honda B18B1 | Full designation |
| Acura Integra LS engine | Application search |
| B18B non-VTEC | Configuration designation |
| LS engine Honda | Short form buyer |
| B18 engine for sale | Family designation |
| Honda 1.8L engine | Displacement-format buyer |
| B18B1 OBD2 | OBD generation buyer |
| LS VTEC base engine | Build-specific buyer- very high intent |
| Integra engine swap | Swap community buyer |
Used OEM vs Rebuilt- Which Is Right for You?
Used OEM is the right choice for a direct Integra LS/RS/GS/SE replacement and the most cost-effective starting point for an LS/VTEC build. Our B18B1 units are compression tested with OBD generation and timing belt condition documented.
A rebuilt B18B1 makes sense if you are building an LS/VTEC engine with specific bore, deck height, and compression requirements. B-series rebuild specialists can build a fresh B18B1 bottom end to your exact specifications for $800 to $1,800 or more. Call us if your application requires specific machine work.
Mileage varies by unit. Where available from the donor vehicle we provide it. Where it cannot be confirmed, we disclose this before your order is placed.
| Displacement | 1 | 834 cc (1.8L / 111.9 cu in) |
|---|---|
| Engine Code | B18B1 (USDM) | B18B (JDM) |
| Configuration | 16 valves | DOHC | Inline-4 |
| Bore X Stroke | 81 mm x 89 mm |
| Compression Ratio | 9.2:1 (USDM) | 9.4:1 (JDM) |
| Horsepower | 142 hp at 6 | 300 rpm (USDM) |
| Torque | 200 rpm | 127 lb-ft at 5 |
| Redline | 6 | 800 rpm |
| Rev Limiter | 7 | 200 rpm |
| Vtec | NO- this is a non-VTEC DOHC engine |
| Obd Generation | OBD1: 1994 to 1995 (PR4 ECU) | OBD2: 1996 to 2001 (P75 ECU) |
| Block Material | Aluminum alloy with cast iron liners |
| Block Deck Height | 212 mm |
| Timing System | Rubber timing belt- interference engine- MUST replace at installation |
| Production Years | 1994 to 2001 (B18B1 in USDM Integra) |
| Manufacturer | Honda Motor Co. |
| Applications | Acura Integra LS RS GS SE (1994 to 2001) | LS/VTEC swap base engine |
| Condition | Used OEM | compression tested and inspected |
Needed a B18B1 OBD2 for my Integra LS after a head gasket failure destroyed the original. Vaz confirmed the OBD2 generation and compression tested all 4. Numbers came back 181 to 188- excellent. Replaced the timing belt at install as recommended. Car runs perfectly and I've got the correct OBD generation for my harness.
Bought an OBD1 B18B1 as the base for my LS/VTEC build. Vaz confirmed the OBD1 generation (PR4 ECU era) which is what I wanted for my '94 Civic swap. Compression was solid across all 4. One cam seal was seeping- disclosed before I bought. Replaced it before grafting the B16A head. Build is running strong at 210 whp.
Every used Honda B18B1 Engine For Sale sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To make a claim, contact us within 15 days of delivery at (240) 301-0095 or info@vazautosolutions.com.
