Volkswagen air cooled engine
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| E-motor | |
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| Manufacturer: | Volkswagen |
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| Type: | Flat-4 |
| Bore: | 75 mm |
| Stroke: | 64 mm |
| Displacement: | 1131 cm³ |
| Block alloy: | Aluminum / Magnesium |
| Head alloy: | Aluminum |
| Valvetrain: | OHV |
| Fuel system: | Normally aspirated |
| Cooling system: | Air-cooled |
| Power output: | 25 bhp (19 kW) @ 3300 RPM |
| Specific power: | 17 kW/L |
| Torque output: | 75 ft·lbf (68 N·m) @ 2000 RPM |
| Compression ratio: | 5.8:1 |
The Volkswagen air cooled engine is one of the most widely used and versatile internal combustion engines in the world. Variations of this engine were produced by Volkswagen plants around the world from 1936 until 2006.
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[edit] History
[edit] Development
Cast iron cylinders, forged crankshaft and connecting rods, and cast aluminum pistons were hallmarks of the design.
[edit] Usage
The aircooled 4-cylinder opposed cylinder Beetle engines have been used for other purposes as well. Especially interesting is its use as an experimental aircraft engine. This type of Beetle engine deployment started in the sixties. A number of companies still produce aero engines that are VW Beetle engine derivatives: Limbach, Hapi, Revmaster and others. Kitplanes or plans built experimental aircraft were specifically designed to utilise these engines.
Up until 2001, Beetle engines were also used to run several of the ski lifts at the Thredbo ski resort in NSW, Australia, and were maintained to a high standard by expert VW mechanics.
Also in Australia, in remote opal-mining communities VW motors were modified to air compressors for jack hammers etc. They used 2 cylinders on one side as a motor and modified the head on the other side to produce a flow of compressed air. The opal fields are very dry and hot, so an air-cooled compressor has an advantage over liquid cooled.
[edit] Volkswagen land vehicles
[edit] German military
[edit] Type 1
[edit] Type 2
Like the Beetle, the first Transporters used the Volkswagen air cooled engine, a 1.2 L, 25 hp (19 kW), air-cooled four-cylinder boxer engine mounted in the rear. The 36 hp (22 kW) version became standard in 1955 while an unusual early version of the 40 hp (25 kW) engine debuted exclusively on the Type 2 in 1959. This engine proved to be so uncharacteristically troublesome that Volkswagen recalled all 1959 Transporters and replaced the engines with an updated version of the 40 hp (25 kW) engine. Any 1959 models that retain that early engine today are true survivors. Since the engine was totally discontinued at the outset, no parts were ever made available.
This second-generation Type 2 lost its distinctive split front window and was slightly larger and considerably heavier than its predecessor. Its common nicknames are Breadloaf and Bay-window, or Loaf and Bay for short. At 1.6 L and 48 DIN hp (35 kW), the engine was also slightly larger.
The T2b was introduced by way of gradual change over three years. The 1971 Type 2 featured a new, 1.6 L engine with dual intake ports on each cylinder head and was rated at 50 DIN hp (37 kW). An important change came with the introduction of front disc brakes and new wheels with brake ventilation holes and flatter hubcaps. 1972's most prominent change was a bigger engine compartment to fit the larger 1.7 to 2.0 L engines from the VW Type 4, and a redesigned rear end which eliminated the removable rear apron. The air inlets were also enlarged to accommodate the increased cooling air needs of the larger engines.
This all-new, larger engine is commonly called the Type 4 engine as opposed to the previous Type 1 engine first introduced in the Type 1 Beetle. This engine was called "Type 4" because it was originally designed for the Type 4 (411 and 412) automobiles. There is no "Type 2 engine" or "Type 3 engine", because those vehicles did not feature new engine designs when introduced. They used the "Type 1" engine from the Beetle with minor modifications such as rear mount provisions and different cooling shroud arrangements.
In the Type 2, the VW Type 4 engine was an option for the 1972 model year onward. This engine was standard in models destined for the US and Canada. Only with the Type 4 engine did an automatic transmission become available for the first time in the 1973 model year. Both engines displaced 1.7 L, rated at 66 DIN hp (49 kW) with the manual transmission and 62 DIN hp (46 kW) with the automatic. The Type 4 engine was enlarged to 1.8 L and 68 DIN hp (50 kW) for the 1974 model year and again to 2.0 L and 70 DIN hp (52 kW) for the 1976 model year. As with all Transporter engines, the focus in development was not on power, but on low-end torque. The Type 4 engines were considerably more robust and durable than the Type 1 engines, particularly in transporter service.
The T2c, so called since it got a slightly raised roof — by about 10 cm — in the early 1990s, was built for the South American and Central American markets. The T2c was produced in Mexico until 1991* with the 1.6 L air-cooled Type 1 engine, and from 1991 until 1996 with water-cooled engines from the VW Golf (a VW/Audi 1.4L). Since 1997, the T2c has been built in Brazil with air-cooled engines for the Brazilian market and with water-cooled engines for the Mexican market, the latter easily identified by their large, black-coloured, front-mounted radiators. 1
Since production of the original Beetle was halted in late 2003, the T2 remained the only Volkswagen model with the traditional air-cooled, rear-mounted boxer engine when the Brazilian model shifted to water-cooled on December 23, 2005. Previously, the watercooled T2c was sold in Mexico between 1991-2002.
[edit] Type 3
The Type 3 was initially equipped with a 1.5 L (1493 cc) engine based on the air-cooled flat-4 found in the Type 1. While the long block remained the same as the Type 1, the engine cooling was drastically changed to allow for a much lower engine profile. This resulted in increased area for cargo stowage with the so-called "Pancake" or "Suitcase" engine. This engine's displacement would later increase to 1600cc.
Originally a single- or dual-carburetted 1.5 L engine, (1500 N, 45 hp or 1500S, 54 hp) the Type 3 engine got a larger displacement (1.6l 1600 cc) and modified in 1968 to include Bosch D-Jetronic electronic fuel injection as an option, making it one of the first mass production consumer cars with such a feature (the first was the Type 4 VW 411).
[edit] Type 4
While the Type 4 was discontinued in 1974 when sales dropped, its engine became the power plant for Volkswagen Type 2s ("Kombis") produced from 1972 to 1979: it continued in modified form in the later "Vanagon" which was air-cooled from 1980 until mid-1983. The engine that superseded the Type 4 engine in late 1983 retained Volkswagen Type 1 architecture, yet featured water-cooled cylinder heads and cylinder jackets. The Wasserboxer, VW speak for a water-cooled, opposed-cylinder (flat or boxer engine), did not enjoy the reputation for longevity that the original air-cooled design had forged. From the very start, the engine suffered cylinder-to-head sealing problems, mostly due to galvanic corrosion, often a result of slack maintenance schedules. Volkswagen discontinued the engine in 1992, upon the introduction of the Eurovan.
[edit] Porsche 914
Volkswagen versions originally came with an 80 hp fuel-injected 1.7 L flat-4 engine based on the Volkswagen air cooled engine. In Europe, the four-cylinder cars were sold as Volkswagen-Porsches, at VW dealerships. This "tainted" the car in the opinion of many automotive critics of that era, and a little of that attitude persists to this day.
Slow sales and rising costs prompted Porsche to discontinue the 914/6 variant in 1972 after producing 3,351 of them; its place in the lineup was filled by a variant powered by a new 95 HP 2.0 L, fuel-injected version of Volkswagen's Type 4 engine in 1973. For 1974, the 1.7 L engine was replaced by a 76HP 1.8 L, and the new Bosch L-Jetronic fuel injection system was added to American units to help with emissions control. 914 production ended in 1976. The 2.0 L engine continued to be used in the Porsche 912E, which provided an entry-level model until the Porsche 924 was introduced.
