VW EA839
| Volkswagen AG | |
|---|---|
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| EA839 | |
| Production period: | since 2016 |
| Manufacturer: | Volkswagen AG |
| Working principle: | Otto |
| Motor design: | V-engine , six-cylinder |
| Valve control: | DOHC |
| Displacement: | 2894-2995 cm 3 |
| Mixture preparation: | Direct injection |
| Engine charging: | Turbocharger with intercooler |
| Power: | 243-331 kW |
| Previous model: | VW EA837 |
| Successor: | none |
The VW EA839 (EA = development order) is a gasoline engine series from Volkswagen AG , which was developed by Audi in the lead . The series comprises six cylinder - V engines and the Volkswagen Group used in different vehicles since 2016th The engines are produced by Audi Hungaria Zrt. in Győr .
The 3.0 l engines (3.0 TFSI) have one turbocharger , the 2.9 l engines (2.9 TFSI) have two turbochargers ( biturbo ). All engines have direct petrol injection .
technology
The 3.0 TFSI engine is operated in parts of the engine map in what is known as the Miller cycle . This means that the intake valves close well before the piston reaches its bottom dead center , which artificially creates a smaller displacement or the effective compression phase begins later than in a conventional engine. Compared to the compression phase, the expansion phase is longer; the longer expansion of the gas increases the efficiency.
Base engine
The displacement of the 3.0-TFSI six-cylinder - V-type engine is 2995 cm³ with a bore of 84.5 mm and a stroke of 89.0 mm, mm at a cylinder distance from the 93rd The geometric compression ratio is 11.2: 1. The V angle of the engine is 90 degrees. The cylinder crankcase is manufactured from an aluminum-silicon alloy using the sand casting process. The very wear-resistant iron coating of the raceways through atmospheric plasma spraying is new . The engine weighs a total of 172 kg.
The 2.9-liter engine is derived directly from the 3.0-liter engine. The displacement is reduced to 2894 cm³ by shortening the stroke by 3 mm to 86.0 mm. Another change concerns the crankshaft main bearings, which have a 2 mm larger diameter due to the higher load.
Valve train
The gas exchange is controlled by four valves per cylinder ( four-valve technology ) and a total of four overhead camshafts driven by a timing chain . The crankshaft first drives the balance shaft , which sits in the V of the cylinder banks, via gear wheels . The balancer shaft with roller bearings is now connected to the four camshaft sprockets by chains. These are tri-oval (slightly triangular) in order to compensate for force peaks and to ensure that the engine runs smoothly.
The engines have a stepless adjustment of the intake and exhaust camshafts by means of hydraulic phase adjusters, the maximum adjustment angle is 50 degrees crank angle. In addition, the engines have the so-called Audi valvelift system (AVS) , i. H. a two-stage stroke changeover of the intake valves. When the load is higher, the system switches to a different cam profile, which increases the lift of the intake valves from 6 mm to 10 mm and at the same time increases the opening time of the intake valves from 130 to 180 degrees of crank angle. These measures enable improved cylinder filling.
Charging and exhaust
The 3.0 TFSI engine has an exhaust gas turbocharger (monoturbo) that works according to the twin-scroll principle. The turbocharger is located in the inner V of the cylinder banks, i.e. H. the exhaust side is inside and the intake side is outside. This enables a compact design of the motor and keeps the gas flow paths short. The maximum boost pressure of the engine is 2.5 bar (absolute).
The 2.9 TFSI engine, on the other hand, has two turbochargers (biturbo), each of which is charged with the exhaust gases from a cylinder bank. The exhaust side of the 2.9 TFSI is also in the inside V. The maximum boost pressure of the engine is also 2.5 bar (absolute).
In both engines, the exhaust manifold is integrated into the cylinder head and the coolant flows around it, which enables the engine to heat up more quickly and, on the other hand, allows the exhaust gas temperature to be reduced. In this way, consumption can be reduced at full load, as there is less need to be enriched. All engines have a close-coupled three-way catalytic converter .
cooling
The crankcase and the cylinder head have separate cooling circuits (split cooling). During a cold start, the coolant pump initially remains completely switched off. Only when the operating temperature of the cylinder head is reached does the coolant pump switch on the water circuit through the entire cylinder head. The crankcase cooling circuit is only integrated when the coolant in the crankcase has reached its limit temperature.
Others
The engines have a fully variably controlled oil pump. The high-pressure fuel pump injects the fuel into the combustion chambers at 250 bar.
variants
2.9-l six-cylinder (2.9 TFSI)
| Manufacturer | model series | Construction period |
|---|---|---|
| Output: 324 kW (440 hp) at 5650–6600 rpm, torque: 550 Nm at 1750–5500 rpm | ||
| Porsche | Porsche Panamera II | since 11/2016 |
| Porsche Cayenne III | since 08/2017 | |
| Porsche Macan | since 08/2019 | |
| Output: 331 kW (450 hp) at 5700-6700 / min, torque: 600 Nm at 1900-5000 / min | ||
| Audi | Audi RS4 B9 | since 11/2017 |
| Audi RS5 F5 | since 06/2017 | |
3.0-l six-cylinder (3.0 TFSI)
| Manufacturer | model series | Construction period |
|---|---|---|
| Output: 243 kW (330 hp) at 5400-6400 / min, torque: 450 Nm at 1340-4900 / min | ||
| Porsche | Porsche Panamera II | since 11/2016 |
| Output: 250 kW (340 hp) at 5000–6400 rpm, torque: 500 Nm at 1370–4500 rpm | ||
| Audi | Audi A6 C8 | since 01/2019 |
| Audi A6 allroad quattro C8 | since 09/2019 | |
| Audi A7 C8 | since 02/2018 | |
| Audi A8 D5 | since 09/2017 | |
| Audi Q7 | since 09/2019 | |
| Audi Q8 | since 02/2019 | |
| Output: 250 kW (340 hp) at 5300-6400 / min, torque: 450 Nm at 1340-5300 / min | ||
| Porsche | Porsche Cayenne III | since 08/2017 |
| Volkswagen | VW Touareg III | from 04/2018 |
| Output: 260 kW (354 hp) at 5400-6400 / min, torque: 500 Nm at 1370-4500 / min | ||
| Audi | Audi S4 B9 | since 11/2016 |
| Audi S5 F5 | since 07/2016 | |
| Audi SQ5 FY | since 06/2017 | |
| Porsche | Porsche Macan | since 12/2018 |