Mazda 13B-REW Engine Specs

The Mazda 13B-REW is a 1.3-liter twin-turbocharged twin-rotor Wankel rotary engine produced from 1992 to 2002, used exclusively in the third-generation Mazda RX-7 (FD3S) and the Japanese-market Cosmo, and one of the most distinctive and celebrated engines ever put into series production. Unlike every other engine in this database, the 13B-REW has no pistons, connecting rods, or conventional cylinders at all - instead, two triangular rotors spin eccentrically within epitrochoidal housings, producing power through a fundamentally different mechanical process than a reciprocating engine.

This rotary design gives the 13B-REW a character unlike anything else on the road: because there is no reciprocating mass to bring to a stop and reverse direction thousands of times per minute, the engine is capable of revving with an extraordinary smoothness and eagerness, redlining at around 8,000rpm and producing 276hp from a nominal displacement of just 1.3 liters with the help of a sequential twin-turbocharger system that broadens what would otherwise be a narrower rotary powerband. The result is an engine with an exceptional power-to-weight ratio, a genuinely unique exhaust note, and driving characteristics that made the FD RX-7 one of the most admired sports cars of the 1990s.

Rotary engines, however, come with fundamentally different maintenance requirements from conventional piston engines, and the 13B-REW is no exception. The apex seals - the components that seal each rotor's tips against the housing - are a wear item by design, and their condition is the single most important factor in a rotary engine's remaining life; compression testing before purchase is essential. Historically, Mazda recommended pre-mixing a small amount of two-stroke oil with the fuel (or relying on the factory metering oil pump) to lubricate the apex seals and rotor housings, and maintaining this lubrication properly is critical for longevity. The cooling system runs under significant thermal stress by design and must be kept in excellent condition, as overheating is one of the fastest ways to damage a rotary engine. Carbon buildup on the apex seals and rotor housings can accelerate wear if the engine is not driven and warmed up correctly, and proper warm-up and cool-down procedures - particularly avoiding hard acceleration from cold and allowing the turbos to spool down before shutoff - are essential rotary-specific habits that any prospective owner needs to learn and follow.