It was a monster of a car. The Mugen Motul Civic that won the overall class victory at the 1987 Japan Touring Car Championship (JTCC) was a Group A race car based on the twin-cam Si that joined the third-generation Civic line-up in 1984. The Si, the first Honda production car to be equipped with a DOHC engine in 20 years, made for an ideal Group A race car. Developed by Mugen, the Civic entered its third season in the JTCC in 1987 with all guns blazing. The Mugen Motul Civic was driven by Osamu Nakako and Hideki Okada.
The Civic raced in ‘Division 1’ for cars with engine displacements from 1,001 cc through to 1,600 cc, but the car was so fast it overtook machines in Division 2 and occasionally those in Division 3, where engine displacement was as big as 2,500 cc. In fact, in the opening race of the West Japan Circuit, not only did the Civic win its own class, but its front-wheel-drive layout gave it an advantage over rear-drive cars in wet conditions, and it overtook a BMW 635CSi to finish 2nd overall. Again, even in the scorching heat in the 3rd round at Tsukuba Circuit, it took 2nd overall. In the end, the Civic won all six rounds in class, delivering the constructors' title to Honda.
What’s so special about this particular engine?
The ZC1 is the first double overhead camshaft engine that Honda ever built. Mugen built the engine for the Japanese Touring Car Challenge. It produced more than 225hp at 9500rpm without using a turbo. They changed the camshafts, injectors, modified the cylinder head, and a lot of other things they kept secret. The header and intake seem like they are stock, but maybe Mugen modified them? I don’t think we’ll ever fully know what they really did to that engine.
