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2.0L 8v - AR00512
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2.0L 8v - AR00512
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Set of 8 trimetal connecting rod half-bearings for Alfa Romeo 1.3 to 2.0 (Ø 50 mm).
The Alfa Romeo four-cylinder twin-cam engines, from 1.3 to 2.0 litres with 8 valves, power the Giulia, Giulietta, Alfetta, Spider, GTV, 75, 90, 155 and 164, including the Twin Spark versions. ACL and King list the same bearing set for these engines: 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 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 49.987 / 50.000 mm Housing bore Ø 53.693 / 53.708 mm Width 23.4 / 23.44 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B1110H-STD | ACL Race - Untreated | Standard | 1.836 |
| 4B1110H-.25 | ACL Race - Untreated | +0.25 | 1.961 |
| CR4595XP | King Racing - Untreated | Standard | 1.834 |
| CR4595XP0.25 | King Racing - Untreated | +0.25 | 1.961 |
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 XP |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.053 to 0.063 mm | 0.050 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.053 to 0.063 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. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black trimetal alloy 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 | No |
| Available sizes | Standard and +0.25 mm | Standard and +0.25 mm |
This connecting rod bearing set fits the engines of the following Alfa Romeo models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| ALFA ROMEO | Giulia (105_) 1600 Super | AR 00526 | 97–103 hp | 1964–1978 |
| ALFA ROMEO | Giulia GT (105_) 1600 Super | AR 00526 | 103 hp | 1974–1978 |
| ALFA ROMEO | 1750-2000 (105_) 1750 | AR 00548 | 113 hp | 1968–1972 |
| ALFA ROMEO | Berlina (105_) 1750 | AR 00548, AR 01608 | 118 hp | 1968–1972 |
| ALFA ROMEO | GT (105_) 1600 / V 1750 | AR 00526 S, AR 00536, AR 00548 | 102–113 hp | 1963–1977 |
| ALFA ROMEO | Spider (105_) 1600 / 1750 / 2000 | AR 00512, AR 00526, AR 00536, AR 00548, AR 01600 | 109–131 hp | 1966–1977 |
| ALFA ROMEO | Spider (115_) 1600 / 2000 / 2.0 | AR 00515, AR 00526, AR 00536, AR 01544, AR 01563, AR 01588, AR 01590, AR 01615 | 102–128 hp | 1971–1993 |
| ALFA ROMEO | Alfetta (116_) 1.6 / 1.8 / 2.0 | AR 01600, AR 01608, AR 01608 X, AR 01623, AR 01655, AR 01678, AR 01713 | 107–132 hp | 1974–1984 |
| ALFA ROMEO | Alfetta GT (116_) 1.6 / 1.8 / 2.0 | AR 01600, AR 01608, AR 01608 X, AR 01623, AR 01655 | 107–131 hp | 1974–1986 |
| ALFA ROMEO | GTV (116_) 2.0 | AR 01655 | 131 hp | 1978–1986 |
| ALFA ROMEO | Giulietta (116_) 1.6 / 1.8 / 1.8 Turbo / 2.0 | AR 01354, AR 01600, AR 01655, AR 01678 | 106–150 hp | 1977–1985 |
| ALFA ROMEO | Sport Berline tricorps 2.0 | AR 01623 | 112 hp | 1977–1979 |
| ALFA ROMEO | 75 (162_) 1.6 / 1.6 Cat / 1.8 / 1.8 Turbo / 1.8 Turbo i.e. / 2.0 T.S. / 2.0 T.S Cat | AR 06100, AR 06134, AR 06158, AR 06166, AR 06168, AR 06202, AR 06224, AR 61101, AR 61201, AR 61202, AR 67101 | 103–155 hp | 1985–1992 |
| ALFA ROMEO | 90 (162_) 1.8 / 2.0 i.e. | AR 01713, AR 06202 | 116–128 hp | 1984–1987 |
| ALFA ROMEO | 155 (167_) 1.7 T.S. / 1.8 T.S. / 1.8 T.S. Sport / 2.0 T.S. | AR 67101, AR 67102, AR 67103, AR 67105, AR 67201, AR 67402 | 105–144 hp | 1992–1997 |
| ALFA ROMEO | 164 (164_) 2.0 Twin Spark | AR 64103 | 144 hp | 1992–1998 |
