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1.8L 16v - B18C5
Manufacturers
1.8L 16v - B18C5
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Set of 8 trimetal connecting rod half-bearings for the Honda B18C.
The B18C is Honda's 1.8-litre (1,797 cc) 16-valve twin overhead camshaft four-cylinder engine, fitted to the Integra DC2: the B18C1 of the Type R and VTi-R, the B18C2 of the VTi-R, the B18C7 of the Type R and the B18C5 of the Acura Integra. ACL and King list a single bearing set for these engines: same crankpin diameter, a single set covers the family.
From the factory, this engine is fitted with standard production connecting rod bearings, sized for the loads of the original engine: as soon as power, engine speed or boost pressure increase, they reach their limits.
A trimetal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set contains 8 half shells, four pairs for a four-cylinder engine.
The original bearing relies on an aluminium alloy over a steel back, intended for low to medium loads, whereas trimetal is designed for high, sustained loads: an aluminium bi-metal takes around 8,000 psi, a performance trimetal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL / King bearings Crankpin Ø 44.976 / 45.000 mm (King: 44.980 / 45.000 mm) Housing bore Ø 48.000 / 48.024 mm Width 17.5 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B1925H-STD | ACL Race - Untreated | Standard | 1.502 |
| 4B1925HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.489 |
| 4B1925H-.025 | ACL Race - Untreated | +0.025 | 1.515 |
| 4B1925H-.25 | ACL Race - Untreated | +0.25 | 1.627 |
| 4B1925HD-STD | ACL Race - Untreated | Standard, dowel hole | |
| 4B1925HXD-STD | ACL Race - Untreated | Std, increased clearance (HX), dowel hole | |
| 4B1925HD-.025 | ACL Race - Untreated | +0.025, dowel hole | |
| 4B1925HD-.25 | ACL Race - Untreated | +0.25, dowel hole | |
| 4B1925HC-STD | ACL Race - Calico CT-1 | Standard | |
| 4B1925HXC-STD | ACL Race - Calico CT-1 | Std, increased clearance (HX) | |
| CR4287XPC | King Racing - pMaxKote | Standard | 1.502 |
| CR4287XPC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 1.489 |
| CR4287XPC.026 | King Racing - pMaxKote | +0.026 | 1.515 |
| CR4287XPC0.25 | King Racing - pMaxKote | +0.25 | 1.629 |
| CR4287XP.026 | King Racing - Untreated | +0.026 | 1.515 |
| CR4287XP0.25 | King Racing - Untreated | +0.25 | 1.629 |
The references ending in D (4B1925HD-STD, 4B1925HXD-STD, 4B1925HD-.025, 4B1925HD-.25) are the dowel-hole versions: the lower shell has a dowel hole that matches a dowel location on the connecting rod cap. Choose according to whether your connecting rod cap has a dowel or not.
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.
| Size / grade | When to choose it | ACL Race Series | King XPC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.049 to 0.058 mm | 0.045 mm - 0.050 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.074 to 0.083 mm | 0.070 mm - 0.075 mm |
| +0.025 / +0.026 mm | Polished journal | 0.049 to 0.058 mm | 0.045 mm - 0.050 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.049 to 0.058 mm | 0.045 mm - 0.050 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the rod cap to spec, then compare the crushed strip against the gauge to read the clearance.
The ACL and King rod bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide. Its Calico version (HC suffix) adds the CT-1 coating, a dry film lubricant that reduces friction and abrasive wear. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black trimetal alloy, coated with pMaxKote in the XPC version, bearings designed for heavy loads. |
| Criterion | ACL Race Series | King Racing |
| Cross-section |  |  |
| Type | High-performance trimetal bearing | High-performance trimetal bearing |
| Country of manufacture | Australia | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface | Trimetal: steel back, copper layer, soft surface |
| Alloy | Race Series (copper-lead) | pMax Black (hardened copper-lead) |
| Protective coating | No (Race); Calico CT-1 (HC) | Yes, pMaxKote: polymer coating on the surface that limits wear when lubrication drops (start-ups, thin oil film). |
| Available sizes | Standard to +0.25 mm (+ increased clearance HX) | Standard to +0.25 mm (+ increased clearance STDX) |
This connecting rod bearing set fits the B18C1, B18C2, B18C5 and B18C7 four-cylinder engines of the following Honda and Acura models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| HONDA | INTEGRA Coupé (DC) 1.8 VTiR (DC2) / 1.8 Type-R (DC2) | B18C1, B18C2, B18C7 | 170–200 hp | 1993–2001 |
| ACURA | INTEGRA Hatchback 1.8 | B18C5 | 197 hp | 1996–2001 |
