VR6 Wikis (The Full Wiki) — Volkswagen Corrado

10 Июн 2015 | Author: | Комментарии к записи VR6 Wikis (The Full Wiki) — Volkswagen Corrado отключены


Volkswagen Corrado

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Schematic ‘top view’ of a 15° VR6

The VR6 engine is an internal combustion configuration. consisting of six cylinders. It was by the German automotive industry and holding company — Group (VWAG) in the late and evolutions of the original variant are produced by them today.

An ‘overhead view’ of the schematic between engine configurations .

On the an inline-four engine. centre: a V6 engine. and on the right: a VR6 engine.

how the V6 engine requires two separate heads. whereas the VR6 needs one cylinder head, like an or straight engine.

The name VR6 from a combination of V engine V-motor ), and the German word (meaning row engine or straight ) — and so is described as a Vee-Row

This engine configuration can be described as a staggered six, in with the geometry of the Lancia staggered-four, developed in the late (a continuation of Lancia’s design dating back to the 1920s ). engines are an amenable further with both uneven numbers, and with staggered-bank Vee

The VR6 was specifically designed for transverse installations in front-wheel drive By using the narrow angle of 15° the two ‘rows’ in the VR6 engine, it was possible to a six-cylinder engine within the Volkswagen Group four-cylinder-model bays. A wider V6 engine of Vee design would have lengthening existing vehicles to enough crumple zone the front of the vehicle and the engine, and the engine and the passenger cell. The VR6 is to use the firing order of a straight-six (aka inline-six) engine as a result, it is nearly as smooth as an

The narrow angle between allows the use of just one ‘cylinder ‘, and one cylinder head whereas conventional Vee engines two cylinder banks and require two cylinder heads. As a result of just one cylinder head, it allows just two overhead to drive all of the valves. This engine construction, and reduces In early 12 valve VR6 engines, are two overhead camshafts with six cam on each. The forward camshaft has intake valve lobes and exhaust valve lobes to the frontmost three cylinders. The camshaft is designed the same but controls the rearmost three instead. The operating principle of design is most similar to a overhead camshaft (SOHC) Later 24 valve VR6 engines had two overhead camshafts, but now with 12 cam each. However, the operation of the in the 24 valve engine is different to of the earlier 12 valve

engine, in that the front only operates the intake and the rear camshaft only the exhaust valves. The operating of this design is most to a double overhead camshaft design.

Volkswagen Corrado

There are several different of the VR6 engine. The original VR6 engine 2.8 litres and featured a 12 valve (two valves per cylinder). engines produced a DIN -rated power output of 128 kilowatts PS ; 172 bhp ), and 240 newton metres (177 ) of torque .

Detailed specifications

diagram of the piston ‘Vee’ in the VR6 engine.

Note the ‘double camshaft ‘ (DOHC) — however, this fails to show the required length valve shafts.

The VR6 engine features a one-piece cast iron crankcase and block. and one lightweight aluminium crossflow cylinder head. two valves per cylinder. operated by -driven overhead camshafts. All and ignition requirements of the VR6 engine are by Bosch Motronic engine unit (ECU). This management system features an air sensor, dual knock for cylinder-selective ignition knock and Lambda regulation for the air/fuel Exhaust gases are channeled a three-way catalytic converter .

The drop-forged steel. six-throw runs in seven main The connecting rod bearing journals are 22° to one another. Two overhead camshafts operate the automatic hydraulic lifters which, in turn, and close the 39.0 millimetres in) intake valves and 34.3 (1.35 in) exhaust valves. the two ‘rows’ of pistons and cylinders a single cylinder head and gasket. the piston crown (or top is tilted. Since the piston are better not tilted, and will work when perpendicular to the bore, the firewall has a varying leading to unequal thermal and a heavier piston. Intake and valves need different to vary valve overlap may be coaxial like in some 90° To minimise the number of camshafts, rows share their (like some 90° V8). due to the geometry, half of the valve are very long, which may be a in high revving race applications. The intake and exhaust pass closely within the head; this then the intake air/fuel mixture it is ignited by the spark plug. limits the amount of timing that can be used due to an increased of pre-detonation of the air/fuel mixture and has the of reducing the power. This cools the exhaust gasses, hampers the operation of the catalytic In the road car production engine, a plane exhaust manifold is used, and therefore half of the have to be very long, to increased heat insertion the manifold, requiring a heavier and an otherwise unnecessary turn in the manifold. Since the cylinder is decreased a bit too much (as compared to an ),

the longer ports on the four-valve are squeezed into a standing cross section, and do not have the and more ideal lying or half moon cross In road car applications, the intake and ports are typically bent, and the port lengths can easily be An exception is the W engine derivative of the where every second port has a notable chicane.

Volkswagen Corrado
Volkswagen Corrado
Volkswagen Corrado

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