NSU

The year 1972 represented the beginning of the NSU era, for Spiess. With professional competence, Spiess attended to the 4-cylinder injection engines, the1,000cc engine of the NSU TTS and the 1,300cc power unit of the NSU TT. The latter featured as peculiarity a double ignition with two spark plugs per cylinder. In those days, building up an NSU engine and making it ready to race was a time-consuming activity, involving a lot of manual work. Spiess had to farm out the production of many components as they didn't possess all the manufacturing devices themselves, in those days. Quite obviously, this situation resulted in the risk of an easy technology transfer. Hence, the want to execute as many works on the NSU engines as possible in house increased all the time. Already then, the NSU engines featured an extraordinary reliability and an extensive usable speed range. Thanks to their better driveability, the racing engines from Ditzingen prevailed although their competitors featured a higher horse-power output, every now and then.