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Written by Wesley Mahler
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08.11.2006 |
The 13J motor was created in and powered prototype race cars until 1990 when it was replaced by the famous R26B, the 787B engine. The 13J was molded after the 13G three rotor engine, which in turn was modeled off of the successful 13B engine platform.
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The 13J Series
Mazda Four Rotor Engines
The 13J motor was created in and powered prototype race cars until 1990 when it was replaced by the famous R26B, the 787B engine. The 13J was molded after the 13G three rotor engine, which in turn was modeled off of the successful 13B engine platform.
The engine had a special center rotor housing with a phasing gear. The eccentric shaft was created to suit the 4 rotor design, and it had 4 bearings compared to the 2002 which only had 3 bearings for the eccentric shaft.
Most of the engine parts were almost all custom made off the 13B model, the only parts that virtually stayed the same was the 13G and the 13B rotors and rotor housings. They created several different versions of the 13J 4 Rotor Engines, each time creating minor improvements.
13J-M
The “M,” stands for modified. This modified 13J produced 400 bhp @ 8500 rpm. It featured a peripheral port with fixed length intake trumpets, 2 spark plugs per rotor, and EFI. This engine was used in the 1988 Le Mans 767 Mazda Race Car.
13J-MM
This engine produced 630 bhp @ 9000 rpm; it also featured a peripheral port setup with variable length intake trumpets (2 steps only), again 2 plugs per rotor, and an EFI. They changed the apex seals to ceramics, and the side housings were hot sprayed with a ceramic coating to increase the friction and wear resistance. This engine would be put to use in the 1989 Mazda 24 hr Le Mans 767B race car.
13J-L
This was similar to the 13J-MM, although we do not have much information at this time. This engine would be used in the 1990 Le Mans 767B, then to be replaced with the R26B engine.
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Last Updated ( 09.11.2006 )
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