2001 Jetta V5

   

May 2001

NEW V-ENGINE PROVIDES EXTRA POWER FOR VOLKSWAGEN'S JETTA V5

Volkswagen's top-of-the-range Jetta V5 gets a substantial increase in power this month with the introduction of an all-new 20-valve V-engine. This latest technology sees the Jetta V5 receiving an all-new five-cylinder engine that has been converted to four valves per cylinder with variable intake and exhaust valve timing and an increase of power from 110 kW to 125 kW

The torque peak of 220 Nm is reached at a relatively lowly 3 300 r/min with maximum power of 125 kW arriving at 6 200 r/min. Top speed of the Jetta V5 is a claimed 224 km/h, while it is said to reach 100 km/h in 8.9 seconds from standstill.

The new engine which recently went into production derives it's increased power from a number of changes aside from the addition of the extra 2 valves per cylinder. The compression ratio has been increased to 10.75.   Volkswagen's Head of Product Engineering August Jukel said the major change from the previous engine has been the extension of the existing variability of the intake camshaft to the exhaust camshaft. "To do this, a new adjustment system has been introduced in which the camshaft adjusters work according to the principle of a hydraulic oscillating motor. The system's advantages include its compact construction, which results in only a slight increase in engine length. The system also allows a two-stage chain-drive similar to that in the two-valve engine, " said Jukel.

"The theoretical limits of the adjustment angle are determined by the engine geometry (contact between valves and piston crown) not by the capabilities of the adjuster unit itself. The pressurized oil required to operate the adjusters is supplied to the control element via the cylinder head oil channel. The control element contains the 4/2-way control valves and transfers the oil to the camshaft. Oil is supplied to the working chambers of the adjuster units via radial channels and five axial channels drilled into the camshafts. "The intake adjuster is constantly controlled by a closed-loop system, while the exhaust adjuster works by a two-position system. The initial position of the adjusters when the engine is started is fully retarded. The valve timing thereafter is determined by the operating conditions. 
"At full throttle the intake camshaft is adjusted via closed-loop control to achieve maximum cylinder charge filling - based on the parameters of engine speed and position of the variable intake manifold. At part throttle the opening of the intake valves is advanced, leading to a reduction in fuel consumption and exhaust emissions, due to internal
exhaust gas re-circulation. In the five-cylinder engine that we have in the Jetta the ignition system has been converted to individual coils for each cylinder, which are located in the spark plug compartment."

"The conversion of the valve-train from bucket tappets to roller-rocker fingers and the variable valve timing both lead to improved fuel economy. When idling the new engine consumes 16.5 % less fuel than the two-valve engine. Specific fuel consumption at part throttle has been reduced by 7.2%. "Variable valve timing also leads to a major reduction in the emission levels in the untreated exhaust gas. At part throttle a reduction in hydrocarbon emissions of up to 11.8 % and in NOx emissions of up to 50 % is achieved. 

The new Jetta V5 also features a number of details to distinguish it from the rest of the range. These include a chrome package comprising trim strips in the bumpers and on the sides of the body, black leather upholstery and seat heating, anti-spin regulation (ASR) and the "5" in V5 changing from silver to red.
The V5 is covered by a three-year mechanical warranty and a 12-year anti-corrosion guarantee. Service intervals are every 15 000 kilometres.

The price of the Jetta V5 has been set at R182 870.