Popular Modifications for Mazda Rotary Engines Ashley Barone | Mar 30, 2015 3:59:35 PM The Mazda RX7 is a very popular car in the tuner community. Its unique styling was far ahead of its competition in the early 90s. Sadly many of these cars on the road today have had the rotary engine swapped out for a traditional piston engine. Generally this is because the rotary motor’s unique design can be somewhat intimidating to non-enthusiasts. The most popular rotary was the 13b 1.3L engine, which produces at its peak build up to 280 hp, maxing out at 9,000 rpm with ease. In 1990 Mazda came out with a luxury car called the Eunos Cosmo . This car was produced to compete with the European luxury cars of its day. It was equipped with the first touch screen navigation and could even sync a mobile phone. This car had many firsts, but the most noteworthy was a three-rotor twin-turbo engine. Only five thousand were made within the six years of production and most of those cars did not