Honda B18C Engine 1.8L VTEC
The Honda B18C is a 1.8-liter, DOHC VTEC inline-4 engine, widely regarded as one of the greatest naturally aspirated 4-cylinder engines ever produced. Found in the legendary Integra Type R (DC2/DB8) and JDM Integra SiR (DC2), this engine features a hand-polished cylinder head, factory balanced rotating assembly, and an 8,400+ RPM redline. The B18C represents the pinnacle of Honda's B-series engineering and remains the gold standard for high-revving, naturally aspirated performance.
Parameter | Value |
|---|---|
Engine Code | B18C (various: B18C1, B18C3, B18C4, B18C5, B18C6, B18C7) |
Configuration | Inline-4 (Straight 4) |
Displacement | 1,797 cc (1.8L) |
Bore x Stroke | 81 mm x 87.2 mm (Undersquare / Long-stroke design) |
Cylinder Block Material | Cast Iron (Open deck) |
Cylinder Head Material | Aluminum |
Valvetrain | DOHC, 4 valves per cylinder, with VTEC (cam-shifting on intake & exhaust) |
Compression Ratio | 10.0:1 – 11.1:1 (depending on variant) |
Fuel System | Multi-Point Electronic Fuel Injection (MPFI) |
Ignition System | Distributor-based (with electronic advance) |
Engine Weight (Dry) | 148 kg (326 lbs) |
Redline | 8,400 – 9,000 RPM (depending on variant) |
Variant | Application | Power | Torque | Redline | Compression |
|---|---|---|---|---|---|
B18C5 (JDM Type R) | Integra Type R (DC2/DB8) - JDM | 197 hp @ 8,000 rpm | 134 lb-ft @ 7,500 rpm | 9,000 rpm | 11.1:1 |
B18C5 (USDM Type R) | Integra Type R (DC2) - USDM | 195 hp @ 8,000 rpm | 130 lb-ft @ 7,500 rpm | 8,400 rpm | 10.6:1 |
B18C1 (GSR) | Acura Integra GS-R (DC2/DB8) - USDM | 170 hp @ 7,600 rpm | 128 lb-ft @ 6,200 rpm | 8,200 rpm | 10.0:1 |
B18C3 (JDM SiR) | Integra SiR (DC2) - JDM | 178 hp @ 7,600 rpm | 129 lb-ft @ 6,200 rpm | 8,400 rpm | 10.6:1 |
B18C4 | Honda Civic (MB6) - EDM | 169 hp @ 7,600 rpm | 128 lb-ft @ 6,200 rpm | 8,200 rpm | 10.0:1 |
B18C6 (EDM Type R) | Integra Type R (DC2) - Europe | 187 hp @ 8,000 rpm | 131 lb-ft @ 7,500 rpm | 8,600 rpm | 11.0:1 |
B18C7 (AUDM Type R) | Integra Type R (DC2) - Australia | 190 hp @ 8,000 rpm | 133 lb-ft @ 7,500 rpm | 8,600 rpm | 11.0:1 |
VTEC (Variable Valve Timing and Lift Electronic Control): Switches between low-RPM and high-RPM cam profiles. On Type R variants, VTEC engages on both intake AND exhaust valves for maximum high-RPM power.
Hand-Polished Intake and Exhaust Ports (Type R only): Factory port-matching and polishing improves airflow without aftermarket work.
Factory Balanced Crankshaft and Connecting Rods: Blueprinted and balanced at the factory for smooth operation at 9,000 RPM.
High Compression Pistons: Cast aluminum pistons with compression ratios up to 11.1:1 (JDM Type R) for maximum naturally aspirated efficiency.
Dual Valve Springs (Type R only): Prevents valve float at extreme RPM.
Reinforced Connecting Rods (Type R only): Shot-peened and weight-matched rods for high-RPM durability.
81mm x 87.2mm Bore/Stroke: Long-stroke design emphasizes mid-range torque while still revving beyond 8,000 RPM.
Open Deck Cast Iron Block: Robust and rebuildable, though less boost-friendly than closed-deck designs (K-series or 2JZ).
DOHC 16-Valve Cylinder Head: High-flow cross-flow design with mechanical (solid) lifters on performance variants.
Variant | Donor Vehicle | Key Notes |
|---|---|---|
B18C5 (JDM) | Integra Type R (DC2/DB8) 1995-2001 | Highest performance. 9,000 RPM redline. Hand-ported head. |
B18C5 (USDM) | Acura Integra Type R (DC2) 1997-2001 | Slightly detuned for US market. 8,400 RPM redline. |
B18C1 | Acura Integra GS-R (DC2/DB8) 1994-2001 | Most common and affordable performance B18C. |
B18C3 | JDM Integra SiR (DC2) 1995-1999 | Mid-tier performance between GS-R and Type R. |
B18C4 | Honda Civic VTi (MB6) 1996-2000 | European market. Fits B-series mounts. |
1x Honda B18C Longblock (Cylinder head + engine block)
1x Intake Manifold (Type R vs. GS-R differ – specify)
1x Exhaust Manifold (4-2-1 factory header)
1x Distributor (if included – specify)
Injectors, alternator, starter, and ECU .