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2.5L 20v - DAZA DNWA
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2.5L 20v - DAZA DNWA
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Set of 10 trimetal connecting rod half-bearings for Audi 2.5 TFSI EA855 (Ø 47.77 mm).
The 2.5 TFSI is Audi's turbocharged, direct-injection in-line five-cylinder, displacing 2.5 litres (2,480 cc) with 20 valves. It powers the Audi RS3, TT RS and RS Q3 as well as the KTM X-Bow GT-XR, from 310 to 500 hp depending on the version (engine codes CEPA, CEPB, CTSA, CZGA, CZGB, DAZA and DNWA). These versions share the same crankpin diameter: a single bearing set covers the whole family.
From the factory, the Volkswagen Group fits this engine with standard connecting rod bearings, supplied as graded half shells. These bearings are sized for the loads of the original engine: as soon as power, revs or boost pressure rise, they reach their limits.
A trimetal bearing stacks three layers: a steel back, a copper-alloy 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 a five-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 47.758 / 47.778 mm Housing bore Ø 50.600 / 50.619 mm Width 17.4 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5B5562H-STD | ACL Race - Untreated | Standard | 1.405 |
| 5B5562HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.392 |
| 5B5562H-.025 | ACL Race - Untreated | +0.025 | 1.418 |
| 5B5562H-.25 | ACL Race - Untreated | +0.25 | 1.530 |
| CR5000GPC | King Racing - Polymer coating | Standard | 1.404 |
| CR5000GPC STDX | King Racing - Polymer coating | Std, increased clearance (STDX) | 1.391 |
| CR5000GPC.026 | King Racing - Polymer coating | +0.026 | 1.417 |
| CR5000GPC0.25 | King Racing - Polymer coating | +0.25 | 1.531 |
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankpin 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 GPC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.051 to 0.061 mm | 0.048 mm - 0.060 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.076 to 0.086 mm | 0.073 mm - 0.085 mm |
| +0.025 / +0.026 mm | Polished journal | 0.051 to 0.061 mm | 0.048 mm - 0.060 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.051 to 0.061 mm | 0.048 mm - 0.060 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 GPC range trimetal bearings for very high loads: a silver-based overlay containing solid lubricant particles, topped with a polymer coating that protects the bearing in case of oil starvation and metal-to-metal contact. |
| 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, bronze layer, silver-based surface |
| Alloy | Race Series (copper-lead) | GPC (silver-based overlay) |
| Protective coating | No | Yes, polymer coating |
| 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 2.5 TFSI five-cylinder of the following Audi and KTM models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| AUDI | A3 Sportback (8PA) RS3 quattro | CEPA | 340 hp | 2011–2012 |
| AUDI | A3 Sportback (8VA, 8VF) RS3 quattro | CZGB, DAZA, DNWA | 367–400 hp | 2015–2020 |
| AUDI | A3 Limousine (8VS, 8VM) RS3 quattro | DAZA, DNWA | 400 hp | 2017–2020 |
| AUDI | Q3 (8UB, 8UG) RS 2.5 quattro / RS performance 2.5 quattro | CTSA, CZGA, CZGB | 310–367 hp | 2013–2018 |
| AUDI | Q3 (F3B) 2.5 RS TFSI quattro | DAZA, DNWA | 400 hp | 2019– |
| AUDI | Q3 Sportback (F3N) 2.5 RS TFSI quattro | DAZA, DNWA | 400 hp | 2019– |
| AUDI | TT (8J3) 2.5 RS quattro | CEPA, CEPB | 340–360 hp | 2009–2014 |
| AUDI | TT Roadster (8J9) 2.5 RS quattro | CEPA, CEPB | 340–360 hp | 2009–2014 |
| AUDI | TT (FV3, FVP) 2.5 RS TFSI quattro | DAZA, DNWA | 400 hp | 2016– |
| AUDI | TT Roadster (FV9, FVR) 2.5 RS TFSI quattro | DAZA, DNWA | 400 hp | 2016– |
| KTM | X-Bow GT-XR 2.5 | DNWA | 500 hp | 2022– |
