Honda B18 Engine for Sale | OEM B18B1, B18C1, B18C5 1.8L DOHC Inline-4

Description

Engine Background

The Honda B18 is the 1.8 liter member of Honda’s legendary B-series engine family, produced from 1990 to 2001 across the Acura Integra lineup. The B18 family contains four distinct production variants that look similar externally but differ significantly in internal hardware, valvetrain, and power output. Understanding the variant differences is the single most important step in buying the right B18 for your build or replacement.

The B18B1 Is the Most Common B18 You Can Buy

For US Integra owners, the B18B1 is the engine code you encounter most often. Fitted to the 1994 to 2001 Acura Integra LS, RS, and GS sedans and coupes, the B18B1 is a non-VTEC DOHC inline four producing 142 horsepower at 6,500 rpm and 127 lb-ft of torque at 5,000 rpm. Despite being the “base” trim B18, the B18B1 is a high-revving Honda engine in every sense: aluminum block, 16-valve DOHC head, sequential PGM-FI, 9.2:1 compression, and a willingness to pull cleanly to its 7,000 rpm redline. Honda built hundreds of thousands of B18B1s, which keeps used pricing reasonable and parts support excellent.

B18B1 horsepower is 142 hp on the factory tune. With a header, intake, exhaust, and a basic ECU calibration, B18B1 builds reach 160-plus hp on stock internals, and the engine is a popular forced induction core for owners targeting 250-plus hp on a budget.

The Four B18 Variants Explained Simply

B18A1 (1990 to 1993): Found in the DA Integra LS. Non-VTEC. 130 hp, 121 lb-ft. OBD-I.

B18B1 (1994 to 2001): Found in the DC2 Integra LS, RS, GS. Non-VTEC. 142 hp, 127 lb-ft. OBD-II from 1996. Most common B18 in the US, the volume engine.

B18C1 (1994 to 2001): Found in the US-spec DC2 Integra GS-R. DOHC VTEC. 170 hp, 128 lb-ft. The “GS-R engine,” widely used as a VTEC swap base.

B18C5 (1997 to 2001): Found in the US-spec DC2 Integra Type R. DOHC VTEC with hand-ported heads, closed-deck block, lighter pistons, and aggressive cams. 195 hp, 130 lb-ft. The most desirable B18 ever produced.

Why Honda Owners Buy a Used B18B1, B18C1, or B18C5

The B-series is the most-supported import engine family in the aftermarket. For Integra owners replacing a worn original, for Civic builders doing a B-series swap into an EG, EK, or DA chassis, or for K-swap holdouts who still prefer the B18 character, a clean used B18 is the foundation of the build. Pricing varies dramatically by variant, with B18C5 Type R units commanding several times the price of a B18B1.

When Replacement Becomes Necessary

• Knock or rattle under load, rod or main bearing wear on high-mileage units
• Loss of compression on one or more cylinders, head gasket or ring wear
• Excessive blue smoke, valve seal wear or piston ring wear
• VTEC engagement failure on VTEC variants, oil pressure or VTEC solenoid issue
• Coolant in oil, head gasket failure (often from previous overheating)
• Severe oil leak from rear main or front crank seal
• Timing belt past replacement interval (B18s use a timing belt, not a chain)

Known Issues We Document Before Shipping

• Compression on all 4 cylinders, the leading indicator of overall condition
• VTEC solenoid screen condition (a critical wear point on VTEC variants)
• Timing belt and water pump condition (both should be replaced on install if past 60k since last service)
• Head gasket integrity, especially on units with previous overheating
• Variant photographed and confirmed (head casting and block deck visible to differentiate B18B1 from B18C1 and B18C5)
• Donor application and mileage documented where available

What Ships and What Does Not

Direct-Fit Vehicle Applications

The Honda B18 was a direct fit in the following vehicles:

Common swap applications: B18 into Civic EG (1992 to 1995), Civic EK (1996 to 2000), Civic EF (1988 to 1991), CRX, and Del Sol. With proper engine mounts, transmission, axles, and ECU, a B18 swap is one of the most documented and supported engine swaps in the import community.

Transmission pairings: Honda Y1 5-speed (B18B1), Y21 LSD 5-speed (GS-R), S80 5-speed (Type R), various Civic B-series transmissions for swap applications.

Inspection Workflow

Every used B18 we ship goes through this process:

• Compression test across all 4 cylinders, pressure per cylinder recorded
• VTEC solenoid operation and screen condition verified (B18C1 and B18C5 only)
• Timing belt condition inspected, replacement recommendation noted
• Head gasket integrity check, especially on units with previous overheating history
• Visual inspection of block deck, head surfaces, and oil galleries
• Variant photographed: head casting number and block deck visible (so you can verify B18B1 vs B18C1 vs B18C5)
• Donor application and approximate mileage documented where available

Where donor mileage is verified, it is shared. Where mileage cannot be confirmed, we disclose this openly before payment. Full inspection notes available on request before order confirmation.

Why Buy From Part Nests

• All 4 cylinders compression-tested with results shared before payment
• Variant photographed and confirmed (B18A1, B18B1, B18C1, or B18C5)
• Head casting and intake style photographed to confirm variant identity
• VTEC solenoid operation tested on VTEC variants (B18C1 and B18C5)
• Timing belt condition inspected with service recommendation
• Head gasket integrity verified on every unit
• Free crated freight to all 50 states, no hidden fees
• No core charge required
• 15 day replacement warranty on internal defects
• Call (240) 306-7051 to speak with someone who knows B18B1 vs B18C1 vs B18C5 differences, GS-R LSD transmission pairing, and Type R closed-deck identification