Siegfried Spiess Motorenbau GmbH
Dieselstrasse 11    D - 71254 Ditzingen
Phone +49 ( 71 56 ) 95 61 - 0
Fax +49 ( 71 56 ) 95 61 - 11


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.

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Construction Design of completely new engines or the enhancement of existing power units –inventive spirit, courage, extensive team work and our huge wealth of represent the basis for innovative results.
Manufacturing Precision components or the refinement of existing components, single copy or small-batch series, solid material or cast material – a diversified service range thanks to an ambitious mix of know-how and new developments.
Quality management Out there on the racetrack, the smallest mistake can be crucial. Therefore, special emphasis is placed to a gapless and absolutely precise quality control. No part will be installed without having been subjected to an extremely strict examination.
Engine manufacturing The engines are individual custom products and are assembled in the heart of the company by a highly qualified team. Here, quality instead of quantity represents the yardstick.
Test bench Here, the process represented by development and design, production and manufacturing comes full circle. On the test rigs, the components or the entire project have to definitively demonstrate if they meet the highest standards.