Because of the engine placement, a T3 has nearly equal 50/50
weight distribution fore and aft. The early air-cooled engines were somewhat expensive to produce and had some reliability problems. Volkswagen originally meant to replace them with the Golf's inline-four engine but the cost of re-engineering both car and engine made them opt for updating the flat-four instead. An overhead-cam design was mooted but rejected as a willingness to rev was considered to be of less importance than low-end flexibility and low cost. The U.S version 1.9-litre and up water-cooled petrol engines experienced significant and repeated problems with cylinder head surface erosion and coolant leaks. 2.1 L engines suffered the same, mostly due to not having the antifreeze changed often enough, and the use of phosphated coolant, which caused corrosion in the cooling system.
Petrol engines There were four general
petrol engine variants between 1979 and 1991, with several sub-models. All were
flat-four boxer engines with
overhead valves, push-rods, and rocker arms. Available engine options differed between regions. •
Air-cooled (1979–1983) Type 1 engine: • (Serial # CT)
air-cooled, single Solex 34 PICT-4
carburettor (not available in the United States)
Type 4 engine • (Serial # CU or CV)
air-cooled, twin Solex 34 PDSIT-2/3 carburettor or
fuel injected (
Bosch L-Jetronic)
flat-four in the 1980 to 1983 models The Wasserboxer features an aluminium case, cylinder heads, and pistons, and a forged steel crankshaft. As with earlier VW boxer engines, it has a gear-driven camshaft. It also features
Heron, or "bowl-in-piston" combustion chambers, where combustion takes place within the piston bowl area rather than in the cylinder head as would be the case with flat top pistons. The switch to water-cooled boxer engines was made mid-year in 1983. T2 transporters or 'bay window' vans, produced in Brazil until 2013, were switched to inline-four-cylinder water-cooled engines and a front-mounted radiator in 2005. Over 3 million vans were produced in
Sao Paulo, Brazil. •
Water-cooled (1983 onwards) • 1.9 Litre engines: • (Serial # DH) "Wasserboxer" engine used for the 1983 to 1985 models, has a
fuel injection system known as "Digijet" (Digital Jet-tronic) • (Serial # DF) 8.6:1 compression ratio, 34-PICT carburettor • (Serial # DG) 8.6:1 compression ratio, 2E3 or 2E4 carburettor • (Serial # EY) 7.5:1 compression ratio, 34-PICT carburettor • (Serial # GW) 8.6:1 compression ratio, Bosch Digijet electronic fuel injection • 2.1 Litre engines: • (Serial # MV) Wasserboxer, used until the end of Vanagon importation to the US in 1991. Uses an engine management system known as
Bosch "Digifant" which digitally manages both ignition timing and fuel delivery. • (Serial # SS) 9:1 compression ratio Wasserboxer • (torque 128) (Serial # DJ) 10.3:1 compression ratio, Digijet injection, only sold in European countries not requiring catalytic converter.
Diesel engines In contrast to the petrol engines' flat-four layout, the
diesel engine options were all of an
inline-four configuration. A turbodiesel arrived in January 1985. • (Serial # CS) Naturally aspirated diesel I4. In the US this was available on 1982 and 1983 models only. • (Serial # JX) Turbocharged I4. • (Serial # KY) Naturally aspirated I4. ==U.S. model variations==