As stated by the BMW Zertifikat dd 16. 04. 2003 the 326 was build in August 1936 and delivered to their dealer in Hamburg in August 1936. This 326 is one of the earlier cars confirmed by the chassis number 75663 and the matching motor number 75663, indicating the car was the 663the of the new series 326.In the early fifties, this car belonged to Dutchman Jacobus Van Der Tuyn, a gifted mechanic and tuner. He has rebuilt 2 BMWs 328 with his company COTURA. Cotura stands for Coos van der Tuyn Racing Automobiles. This 326 was the last project of Coos Van Der Tuyn before his death in 1954. The project was left behind unfinished and remained in rolling chassis form. The 328s of Coos that was used for Coturas were so popular, so he started to focus on the chassis of the 326. The sturdy 326 chassis was shortened from the front, creating a wheelbase of 256 cm. This idea was later considered by BMW for the new 328 which was going to be the 318. However Fritz Fiedler plans were rejected as being too expensive. In 1949 Frazer Nash came with their Le Mans replica, a man for whom Van Der Tuyn had enormous respect for. In the 326 Coos found the same layout as in the Frazer Nash, notable the rear torsion bar suspension and independant suspension up front. Herman Roosdorp, a Belgian with Dutch roots who raced against the Coturas in his Ferrari 166, bought the project after Van Der Tuyn’s death. He brought the project to Antwerp where Roosdorp had a thriving garage of Standard-Vanguard cars and he was a racing car addict. Before the war Roosdorp raced in his Bugatti. After the war he raced in his Ferrari 166, later a Jaguar C type, then again a Ferrari 500 Spyder and a Veritas rs. He gave up racing in 1955 and somehow lost interest in the BMW project which remained hidden in his garage. In all these years he was friends with Dolf De Ridder form a near village in the Antwerp region. After his death in 1965 the BMW project in rolling chassis form, was bought by another garage keeper in the Antwerp region. The garage was owned by Frans Thijs (last owner). He bought the BMW project. The chassis had been stored properly so it was in good condition, all mechanical parts were almost as new. After a body frame was made in superleggera style, the car was entrusted to Pieter van Hoek who had a restoration business near Eindhoven, specialized in BMW. For the body he used the Superleggera method, made of light steel which gave more structural stiffness than aluminum. The fenders were made in aluminum. Total weight is 820 kg so still a bit less then the 328, although with a much stiffer body. The engine valve train was completely reworked. New bronze guides were fitted and the cylinder head shaved. The engine block was cleaned like new and checked for cracks. After checking crankshaft and bearings, no further work was needed. Probably this had already been done by Van Der Tuyn.
Under the hood you will find an original 2L 6 cylinders engine that produces 50 hp. Car comes with Belgian paperwork and Brookland Windshield.
After the car was finished and was in use by the last owner, the following work was carried out:
A 12 volt dynamo was fitted for better starting and better lights
The 4 speed original gearbox was changed for a close ratio 5 speed gearbox T9 which gave a drop in engine revolutions by 800 revs at 120kph, without any alterations on the original rear axle.
A new original brake pump was fitted, also a larger 3 core radiator made to order. Cooling is now with an electric water pump giving 88litre/ min.
Bodywork was done by Victor At Pier Van Hoek’s workshop and Bert for for all mechanical work.
Hugo de Ridder, son of Dolf de Ridder mentioned here before, confirmed the story of Herman Roosdorp who was a regular client in their Jaguar garage, also dealing in BMWs and wonderful classics, for example Bugatti type 57 Grand Raid..
Patrick Van De Pas has done a lot of research work on BMW 328 in the Netherlands and also on the Coturas in Holland. Some of his publications go by this writing.
Coos Van Der Tuyn had it right from the beginning, the finished creation of his thinking has great road holding and is a real sports car. The car was regularly in use by the last owner.
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