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1.3L-2.0L 8v - Twin Cam AR016
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1.3L-2.0L 8v - Twin Cam AR016
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Set of 10 tri-metal crankshaft half shells for the five main bearings of the Alfa Romeo 1.3 to 2.0 litre 8-valve engines.
The Alfa Romeo models fitted with the 1.3 to 2.0 litre 8-valve twin-cam engines, engine codes 101, 105, 115, AR016, AR64103 and AR67201, use the same main bearing. King lists main bearing set MB511XP for these applications: a single set covers these engines.
The crankshaft of these engines runs on five main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The KING RACING tri-metal set shown here replaces them on built engines.
A tri-metal 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 10 half shells, five pairs for five main bearings.
An aluminium bi-metal takes around 8,000 psi, a performance tri-metal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| King bearings Crankshaft journal Ø 59.96 / 59.97 mm Housing bore Ø 63.66 / 63.68 mm Width 25.5 mm (main bearings 1, 3 and 5); 18.3 mm (main bearings 2 and 4) |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| MB511XP | King Racing - Untreated | Standard | 1.827 |
| MB511XP 010 | King Racing - Untreated | +0.25 | 1.954 |
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 | King XP |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.060 mm - 0.073 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.060 mm - 0.073 mm |
Check at assembly: lay a calibrated strip (Plastigauge) on the journal, tighten the main cap following the manufacturer's procedure, then compare the width of the crushed strip with the gauge to read the clearance.
The King main 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.
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black tri-metal alloy bearings designed for heavy loads. |
| Criterion | King Racing |
| Cross-section |  |
| Type | High-performance trimetal bearing |
| Country of manufacture | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface |
| Alloy | pMax Black (hardened copper-lead) |
| Protective coating | No |
| Available sizes | Standard, +0.25 mm |
This main bearing set fits the following vehicles, according to the engine code:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Alfa Romeo | 155 (167_) | AR 67201, AR 67202 | 141 hp | 1992–1995 |
| Alfa Romeo | 155 (167_) | AR 67201, AR 67202 | 144 hp | 1992–1995 |
| Alfa Romeo | 164 (164_) | AR 64103 | 144 hp | 1992–1998 |
| Alfa Romeo | 75 (162_) | AR 01646, AR 01648, AR 01911 | 150 hp | 1985–1986 |
| Alfa Romeo | 75 (162_) | AR 01646 | 158 hp | 1986–1990 |
| Alfa Romeo | 90 (162_) | AR 01646, AR 01911 | 150 hp | 1984–1987 |
| Alfa Romeo | 90 (162_) | AR 01646 | 155 hp | 1984–1987 |
| Alfa Romeo | Alfetta (116_) | AR 01600 | 107 hp | 1975–1984 |
| Alfa Romeo | Alfetta (116_) | AR 01608 X | 116 hp | 1974–1982 |
| Alfa Romeo | Alfetta (116_) | AR 01608 | 121 hp | 1979–1984 |
| Alfa Romeo | Alfetta (116_) | AR 01678 | 122 hp | 1979–1984 |
| Alfa Romeo | Alfetta (116_) | AR 01623 | 121 hp | 1977–1980 |
| Alfa Romeo | Alfetta (116_) | AR 01655, AR 01713, AR 10520 | 132 hp | 1978–1984 |
| Alfa Romeo | Alfetta (116_) | AR 01623 | 112 hp | 1974–1977 |
| Alfa Romeo | Alfetta GT (116_) | AR 01600 | 107 hp | 1976–1982 |
| Alfa Romeo | Alfetta GT (116_) | AR 01608 X | 116 hp | 1974–1976 |
| Alfa Romeo | Alfetta GT (116_) | AR 01608 | 121 hp | 1974–1976 |
| Alfa Romeo | Alfetta GT (116_) | AR 01623 | 121 hp | 1978–1986 |
| Alfa Romeo | Alfetta GT (116_) | AR 01655 | 131 hp | 1977–1984 |
| Alfa Romeo | Berlina (105_) | AR 00548, AR 01608 | 118 hp | 1968–1972 |
| Alfa Romeo | Berlina (105_) | AR 10526, AR 01929, AR 10520, AR 01629 | 132 hp | 1971–1977 |
| Alfa Romeo | GTV (116_) | AR 01646 | 158 hp | 1980–1987 |
| Alfa Romeo | GTV (116_) | AR 01655, AR 06212 | 131 hp | 1978–1986 |
| Alfa Romeo | GTV (116_) | AR 01646 | 156 hp | 1984–1986 |
| Alfa Romeo | Giulietta (116_) | AR 01644 | 90 hp | 1977–1983 |
| Alfa Romeo | Giulietta (116_) | AR 01600 | 107 hp | 1977–1985 |
| Alfa Romeo | Giulietta (116_) | AR 01678 | 122 hp | 1979–1985 |
| Alfa Romeo | Giulietta (116_) | AR 01655, AR 11671 | 131 hp | 1980–1985 |
| Alfa Romeo | Giulietta (116_) | AR 01699 | 170 hp | 1983–1985 |
| Alfa Romeo | Giulietta (116_) | AR 01678 | 120 hp | 1983–1985 |
| Alfa Romeo | Giulietta (116_) | AR 01600 | 106 hp | 1977–1985 |
| Alfa Romeo | Milano Saloon (162_) | AR 01648 | 156 hp | 1986–1989 |
| Alfa Romeo | Spider (105_) | AR 01600, AR 00526, AR 00536 | 109 hp | 1966–1968 |
| Alfa Romeo | Spider (115_) | AR 01615 | 110 hp | 1974–1984 |
| Alfa Romeo | Sport Saloon | AR 01623 | 112 hp | 1977–1979 |
