Volvo P1800 Jensen

Thursday 28 August 2014
The Volvo P1800 is a sports car from Volvo Cars.
The project was started in 1957 because Volvo wanted a sports car, despite the fact that their previous attempt, the P1900, had been a disaster, with only 68 cars sold. The man behind the project was an engineering consultant to Volvo, Helmer Petterson, who in the 1940s was responsible for the Volvo PV444. The design work was done by Helmer's son Pelle Petterson, who worked at Pietro Frua at that time. Volvo insisted it was an Italian design by Frua and only officially recognized that Pelle Petterson designed it in 2009. The Italian Carrozzeria Pietro Frua design firm (then a recently acquired subsidiary of Ghia) built the first three prototypes between September 1957 and early 1958, later designated by Volvo in September 1958: P958-X1, P958-X2 and P958-X3 (P:Project 9:September 58:Year 1958 = P958).
In December 1957 Helmer Petterson drove X1, (the first hand-built P1800 prototype) to Osnabrück, West Germany, headquarters of Karmann. Petterson hoped that Karmann would be able to take on the tooling and building of the P1800. Karmann's engineers had already been preparing working drawings from the wooden styling buck at Frua. Petterson and Volvo chief engineer Thor Berthelius met there, tested the car and discussed the construction with Karmann. They were ready to build it and this meant that the first cars could hit the market as early as December 1958. But in February, Karmann's most important customer, Volkswagen VAG, forbade Karmann to take on the job. They feared that the P1800 would compete with the sales of their own cars, and threatened to cancel all their contracts with Karmann if they took on this car. This setback almost caused the project to be abandoned.
Other German firms, NSU, Drautz and Hanomag, were contacted but none was chosen because Volvo did not believe they met Volvo's manufacturing quality-control standards.
It began to appear that Volvo might never produce the P1800. This motivated Helmer Petterson to obtain financial backing from two financial firms with the intention of buying the components directly from Volvo and marketing the car himself. At this point Volvo had made no mention of the P1800 and the factory would not comment. Then a press release surfaced with a photo of the car, putting Volvo in a position where they had to acknowledge its existence. These events influenced the company to renew its efforts: the car was presented to the public for the first time at the Brussels Motor Show in January 1960 and Volvo turned to Jensen Motors, whose production lines were under-utilised, and they agreed a contract for 10,000 cars. The Linwood, Scotland, body plant of manufacturer Pressed Steel was in turn sub-contracted by Jensen to create the unibody shells, which were then taken by rail to be assembled at Jensen in West Bromwich, England. In September 1960, the first production P1800 (for the 1961 model year) left Jensen for an eager public.
The engine was the B18 (B for the Swedish word for gasoline: Bensin; 18 for 1800 cc displacement) with dual SU carburettors, producing 100 hp (75 kW). This variant (named B18B) had a higher compression ratio than the slightly less powerful twin-carb B18D used in the contemporary Amazon 122S, as well as a different camshaft. The 'new' B18 was actually developed from the existing B36 V8 engine used in Volvo trucks at the time. This cut production costs, as well as furnishing the P1800 with a strong engine boasting five main crankshaft bearings. The B18 was matched with the new and more robust M40 manual gearbox through 1963. From 1963 to 1972 the M41 gearbox with electrically actuated overdrive was a popular option. Two overdrive types were used, the D-Type through 1969, and the J-type through 1973. The J-type had a slightly shorter ratio of 0.797:1 as opposed to 0.756:1 for the D-type. The overdrive effectively gave the 1800 series a fifth gear, for improved fuel efficiency and decreased drivetrain wear. Cars without overdrive had a numerically lower-ratio differential, which had the interesting effect of giving them a somewhat higher top speed (just under 120 mph (193 km/h)) than the more popular overdrive models. This was because the non-overdrive cars could reach the engine's redline in top gear, while the overdrive-equipped cars could not, giving them a top speed of roughly 110 mph (177 km/h).


Technical data:
- engine: 4 cylinders
- capacity: 1800 cc
- horsepower: 100 HP
- gearbox: 5+1
- top speed: 193 km/h