The second car to use the Manta name was launched in August 1975. This two-door "three-box" car was mechanically based directly on the then newly redesigned Opel Ascona, but the overall design was influenced by the 1975 Chevrolet Monza. The Manta had more "sporty" styling, including a droop-snoot nose not seen on the Ascona, which was similar to the UK equivalent of the Ascona, the Cavalier Mk1. The Vauxhall equivalent of the Manta was the Cavalier Mk1 Sports Hatch and Cavalier Mk1 Coupe. Up until 1981, Vauxhall models were sold in continental Europe alongside Opel in 11 countries, resulting in the Vauxhall Cavalier Mk1 Sports Hatch and Coupe, as well as the saloon equivalent of the Ascona B, competing against each other.
Engines were available ranging from the small 1.2-litre OHV engine, the 1.6-litre CIH and the 1.9-litre CIH. Also in 1976, the GT/E engine from the Manta A series was adapted into the Manta B programme spawning the GT/E Manta B series. In 1979 the GT/E had the engine replaced with the new 2.0 litre CIH (actually an overhead cam design, but based on the CIH block) and with a new designed Bosch L injection system. Power output was now 110 PS (108 hp; 81 kW). The 1.9-litre engine gave way to the 2.0 litre S engine which was aspirated by a Varajet II carburettor. This engine was the most used engine by Opel at the time, and was to be found in several Opel Rekord cars. Opel also offered a dealer-installed tuning kit for the fuel-injected engine, promising at least 125 PS (123 hp; 92 kW) thanks to a modified camshaft, valve lifters, and exhaust system.
In 1977, a three-door hatchback version appeared to complement the existing two-door booted car. This shape was also not unique, being available on the Vauxhall Cavalier Sports Hatch variant.
Both Manta versions received a facelift in 1982, which included a plastic front spoiler, sideskirts for the GT/E and GSi models, a small wing at the rear and quadruple air intakes on the grille. Also the 1.2-, 1.6- and 1.9-litre engines were discontinued and replaced by the 1.3-litre OHC engine, the 1.8-litre OHC and the 2.0-litre S and E CIH engines (although the 75 PS 1.9N continued to be available in a few markets). The GT/E was renamed and was called the GSi from 1983 (except in the UK where the GT/E name continued).
Production of the Manta continued well after the equivalent Ascona and Cavalier were replaced by a front-wheel-drive model "Ascona C". The Vauxhall Cavalier Mk1 Sports Hatch and Coupe did not continue past 1981, and there were no coupe versions the MK2 Cavalier range. In 1982 the 1.8-litre Opel Family II engine from the Ascona C was fitted in the Manta B (replacing the CIH unit) making a more economical Manta B to drive. It could run 14 km per litre and use unleaded fuel. The 1.8 was very popular and was in production for 5 years (1982–1987). The 2.0S models where discontinued in 1984 and only the GSi was available with the "large" engine (GT/E in the UK). In 1986 Opel released the last Manta B model the Exclusive (1987 in the UK), giving it all of the best in equipment. Recaro seats with red cloth, grey leather like interior and the full bodypack known from the i200 models. This consisted of twin round headlights in a plastic cover, front spoiler and rear lower spoiler from Irmscher, sideskirts and the known 3 split rear spoiler of the Manta 400 (producing 80 kg (176 lb) of weight on the rear at 200 km/h). In the UK, the Exclusive GT/E models were available in colours such as Dolphin Grey with matching dark grey cloth seats with red piping. These also had the quad headlights, front spoiler but a rear bumper which housed the number plate, coupled with a black plastic strip between the rear light clusters. The rear spoiler was similar to the standard GT/E. Opel finally ceased the production of the Manta B in 1988, only producing the GSi version after 1986 (it was sold as the GT/E in the UK). Its successor, the Calibra - sold as a Vauxhall in Britain, and as an Opel everywhere else - was launched in 1989.
General Motors had decided in 1986 to develop a direct replacement for the Manta, despite a dip in popularity for affordable coupes and sports cars (possibly due to the rising popularity of "hot hatchbacks" like the Volkswagen Golf GTI) which even resulted in Ford deciding not to directly replace the once hugely popular Capri on its demise that year. However, Japanese products like the Honda Prelude and Toyota Celica were enjoying a rise in popularity at this time, while Audi had done well in this sector since launching the Coupe/Quattro in 1980, and Volkswagen had also achieved strong sales of its second generation Scirocco (launched in 1981). Today, these cars are hard to find in an original, good condition; consequently the value has risen considerably over the last few years. It has again become popular, because of its good looks and well-respected handling.
Source: Wikipedia
Last edited by Man of Steel; 11-05-2019 at 01:46 PM.
I'm going to eat breakfast. And then I'm going to change the world.
Rally and special versions
In 1979 work began on a rally-spec Opel. Both the Ascona B and the Manta B were used for this. The Ascona 400 model was the more successful of the two, largely due to better weight distribution.
Opel joined forces with German tuner Irmscher and Cosworth in Britain, to make the 400. Cosworth was given the task to develop a 16-valve 2-cam head for the CIH spec engine block, and Irmscher who earlier in 1977 and 78 had proven that they knew their way around an Opel building the i2800, was to design the exterior and interior of the cars. The results were not bad. Opel however had problems with the engine. The first idea of using a 2.0-litre engine and then using the 16-valve head from Cosworth simply did not give enough power. The problem was that the heads had already been built, so the heads were made to fit on the CIH type 4-cylinder engine block. So they built an unusual engine using a 2.0-litre engine block with an overbore and larger pistons, a crankshaft from the 2.3-litre diesel engine of same type (CIH) and ended with a 2.4-litre engine block. Mounting the 16-valve head on this gave a massive output, and the opportunity to make several tune-ups for the rally drivers.
Opel delivered the first 23 specimens in 1981 which were recognizable by the 2 slot front grille (1982, 83, and 84 models had 4 slot grilles). The cars were delivered as both street cars and factory tuned rally cars. The streetcars known as Phase 1 cars, were luxury versions of the known Manta B Coupé. Although all the changes to give the body more strength were still implemented, the cars were delivered with all kinds of exclusive packaging. Recaro seats with big Opel badges on the cloth, Irmscher leather steering wheel, and even front light washers were mounted. The cars were all delivered in Arctic White colour, with White Ronal lightweight 7x15" alloys. The engine was fitted with a Bosch LE injection system and power output was 144 bhp (107 kW). The Phase 2 however was quite different. It had large extended arches front and rear made of materials such as carbon and kevlar to keep the weight down, lightweight doors, bonnet, spoilers and windows. The wheels were still from Ronal but now measuring 8x15" front and 10x15" rear. The engine output was 230 bhp (172 kW) using a set of 48 mm (1.9 in) DCOE style carburettors, and the cars could be delivered with different gearboxes from ZF and with different rear axle options like LSD. Phase 3 which is also a term used when talking about the i400s was not a factory tune-up. Many racers of the time had their garages tune up the engine even further. Some made it across the 300 bhp (220 kW) mark and even today, engines can be tuned to deliver just over 340 bhp (254 kW) still naturally aspirated.
The Manta 400 was produced in a total of 245 specimens following the homologation regulations by FISA (today FIA). But the i400 also spawned some other "i" models: The first was the i200 which basically was a GSi model Manta B with most of the Manta 400's appearance. 700 were made and are still considered a collector's item. The i200 used a tuned 2.0E engine delivering 125 PS (92 kW). There was also the i240, which is rarer as only 300 were produced, it is fitted with the i400 engine block but using a normal eight-valve cast-iron head from the 2.0E engine. First presented at the 1985 Geneva Motor Show, it produces 136 PS (100 kW; 134 hp) and has a claimed top speed of 200 km/h (124 mph). Also Irmscher themselves tried building the Manta with their own specs. The reason they were used for the 400 project was that in 1977 they had taken a 1977 Manta B 1.9S and put in a 2.8-litre H spec engine from the Opel Admiral of that time. Success was limited, even though the cars were on display at the 1977 Geneva Motor Show. The cars had been painted in some special colours giving it the nickname "Paradiesvogel" (Bird of Paradise) because of the rainbow like colour theme on the cars. However they did produce 28 specimens with the 2.8H engine delivering 150 bhp (112 kW) and 220 N⋅m (162 lb⋅ft) of torque. The cars are considered extremely rare today.
After the success of the 400 (and i200/240) Irmscher once again tried the 6-cylinder layout. This time producing the most powerful Manta B ever released on the public market, the Irmscher i300. In 1985, Irmscher bought 29,400 cars from Opel, which were on stock.[citation needed] The cars had no gearbox or engine but were fitted with the Phase 2 equipment. Irmscher installed the new 3.0-litre LE engine from the Monza and Senator models, which delivered 176 PS (129 kW; 174 hp) and 232 N⋅m (171 lb⋅ft) of torque. Power was transmitted to a big Getrag 265 gearbox, onto a 3.18:1 LSD rear axle, giving the car some awesome specifications. 0-60 mph (97 km/h) took 8 seconds flat and the car could reach a top speed of 225 km/h (140 mph), making it the fastest street Manta ever built. If not for the big 1980s fuel crisis being at its worst at that time, several are sure that Opel would have adapted the idea and built a series of 6-cylinder Mantas. But instead they chose to build the economically more affordable Manta B with a 1.8-litre alloy head OHC style engine in 1985.
Convertible versions
Vauxhall, from 1978 until 1979, offered the Cavalier Coupe in convertible format called the Centaur. Only 118 of these were made and fewer than thirty are believed to survive as of 2007. About a quarter of these conversions were built using a Manta, rather than Vauxhall basis. The cars were developed by Magraw Engineering and sold through Vauxhall dealerships on behalf of Crayford Engineering.
Source: Wikipedia
Last edited by Man of Steel; 11-05-2019 at 01:49 PM.
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