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Falcon 6-cyl OHV 144 170 188 200 250 X Flow
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Falcon 6-cyl OHV 144 170 188 200 250 X Flow
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Set of 12 trimetal connecting rod half-bearings for Ford Falcon 6-cylinder, 144 to 250, 3.9L and 4.0L Barra.
These inline six-cylinder engines are the Ford 144, 170, 188, 200 and 250 (including the X Flow versions), 3.2L, 3.3L, 3.9L, 4.0L (EB, ED, EF, EL, Intech, E-Gas and Barra, turbo included) and 4.1L X Flow, fitted to the Ford Falcon, Cortina and Longreach Ute. ACL lists a single bearing set for these engines: same crankpin diameter, a single set covers the family.
From the factory, these engines are 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 12 half shells, six pairs for a six-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 bearings Crankpin Ø 53.934 / 53.945 mm Housing bore Ø 56.871 / 56.891 mm Width 20.57 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 6B2150H-STD | ACL Race - Untreated | Standard | 1.455 |
| 6B2150HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.442 |
| 6B2150H-001 | ACL Race - Untreated | +0.025 | 1.468 |
| 6B2150H-010 | ACL Race - Untreated | +0.25 | 1.580 |
| 6B2150H-020 | ACL Race - Untreated | +0.50 | 1.705 |
| 6B2150HC-STD | ACL Race - Calico CT-1 | Standard | |
| 6B2150HXC-STD | ACL Race - Calico CT-1 | Std, increased clearance (HX) | |
| 6B2150HC-001 | ACL Race - Calico CT-1 | +0.025 | |
| 6B2150HC-010 | ACL Race - Calico CT-1 | +0.25 |
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 |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.056 to 0.067 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.081 to 0.092 mm |
| +0.025 mm | Polished journal | 0.056 to 0.067 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.056 to 0.067 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.056 to 0.067 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 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. |
This connecting rod bearing set fits the Ford inline six-cylinder engines of the following models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Ford | Falcon | 144, 170, 188, 200 Non X Flow, 250 Non X Flow, 3.9L, 4.0L EB-ED, 4.0L EF-EL, 4.0L Intech, 4.0L E-Gas EFI, 4.0L Barra, 4.0L Barra Turbo | ||
| Ford | Cortina | 250 Non X Flow, 3.2L, 3.3L X Flow (Alloy Head, Cast Iron Head), 4.1L X Flow (Alloy Head, Cast Iron Head) | ||
| Ford | Longreach Ute | 4.0L EF-EL |
