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| Interserie | |
|---|---|
| Name | Interserie |
| Category | Sports car racing |
| Inaugural | 1970 |
| Folded | ongoing |
| Country | Europe (primarily) |
Interserie was a European sports car racing championship established in 1970 that combined prototypes, sports cars, and single-seaters in multi-class competition. Founded by promoters seeking an open-formula alternative to FIA World Sportscar Championship, the series attracted entries from manufacturers, privateers, and teams competing at circuits across Germany, Austria, Czech Republic, Netherlands, Belgium, and other European venues. Interserie became noted for high-speed racing, diverse technical regulations, and headline-grabbing drivers who also appeared in 24 Hours of Le Mans, Formula One, Can-Am, and IMSA GT Championship events.
Interserie began as a response to demand for a European counterpart to Can-Am and early Group 7 sportscar racing, with organizational roots connected to promoters who had worked with ADAC and regional clubs. The early 1970s seasons featured cars and constructors familiar from Sauber, Porsche, McLaren, Chevron, and Lola programs, while attracting drivers who raced in Formula Two, Formula Three, and endurance classics like Spa 24 Hours. Through the 1970s and 1980s Interserie adapted as the FIA introduced Group C and other classifications; entries shifted between open-top prototypes, closed-cockpit sportscars, and silhouette machines. The 1990s and 2000s saw periods of decline and revival influenced by changing commercial motorsport landscapes, interactions with promoters of DTM and BTCC, and resurgence driven by historic and prototype racing enthusiasts linked to organizations such as FIA Historic Motor Sport Commission.
Race formats evolved from long-distance encounters modeled on Can-Am to sprint and endurance combinations similar to European Le Mans Series weekends. Events typically featured multi-class grids with separate trophies, timed qualifying sessions, and sprint races ranging from 30 minutes to 120 minutes alongside endurance rounds. Regulatory oversight intersected with FIA sporting codes and national sporting authorities, while technical rules incorporated aspects from Group 6, Group C, and later FIA GT frameworks. Balance-of-performance and weight/air restrictor measures were sometimes applied to equalize competition among entries from Porsche, BMW, Ferrari, Audi, and prototype constructors like Reynard and Sauber-Mercedes.
Interserie accepted a wide variety of machinery, ranging from prototype chassis like those of March Engineering, Lola Cars, and Ralt to modified sports cars built by Porsche and BMW Motorsport. Classes were often defined by engine displacement, forced induction, and bodywork type: Group 7-style unlimited prototypes, Group 5 silhouette racers, and later Group C prototypes shared grids. Notable models included the Porsche 917, various McLaren M8 derivatives, Lola T70 variants, and bespoke machines from constructors such as Emerson Fittipaldi-linked or Hesketh-related projects. Privateer entries used engines from manufacturers like Cosworth, BMW M10/M12, Ford, and Chevrolet small-block V8s.
Throughout its existence Interserie attracted factory-supported teams and privateers. Teams with connections to Porsche Motorsport and Sauber Motorsport frequently campaigned competitive prototypes, while independent teams from Germany, Italy, United Kingdom, and Netherlands fields entered modified sports racers. Drivers included names who competed in Formula One such as Hans-Joachim Stuck, Jochen Mass, and Jody Scheckter alongside endurance specialists like Derek Bell, Bob Wollek, and Jacky Ickx. Emerging talents who later raced in DTM and WEC—including Klaus Ludwig and Emanuele Pirro—also featured in Interserie lineups.
Interserie rounds were held at high-speed and technical circuits across Europe, including Nürburgring, Hockenheimring, Zandvoort, Circuit de Spa-Francorchamps, Assen, and Brno Circuit. Special events sometimes coincided with major racing festivals or national championships promoted by organizations such as ADAC and ACM. The series also visited historic venues like Monza and shorter, club-level tracks in Austria and Czech Republic where promoter ties to regional clubs enabled mixed grids and spectacle-focused meetings.
Early Interserie seasons produced headline clashes between McLaren Can-Am machinery and Porsche prototypes, delivering memorable wheel-to-wheel duels at Spa and Nürburgring Nordschleife. The arrival of Group C technology prompted dramatic on-track battles between closed-cockpit prototypes and open-top sports cars, creating moments where drivers from Le Mans and Formula One competed directly. Races were sometimes affected by dramatic weather shifts at Zandvoort and Assen, or by regulatory controversies tied to homologation disputes involving Group 5 and Group 7 cars. Famous single events featured large starting grids with entrants from Can-Am, IMSA, and European privateers, generating headline results that resonated in contemporaneous motorsport media outlets.
Season champions included both factory-supported drivers and privateer entrants who mastered the series’ diverse machinery and circuits. Records were set for lap times at fast venues like Hockenheimring and Circuit de Spa-Francorchamps, and lifetime win tallies featured drivers who also secured victories in 24 Hours of Le Mans and national touring championships. Statistical leaders often came from teams affiliated with Porsche, Sauber, and Lola; engine manufacturers such as Cosworth and Chevrolet powered numerous race winners. The series’ historical roll of honor is cited by historic racing organizations and archivists preserving results alongside other European sports car legacies, including European Le Mans Series and FIA World Endurance Championship histories.
Category:Sports car racing series