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 theEunos 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 survive. This car was pillaged for its triple-rotor, twin-turbo 20b engine and the body was trashed.
This sought-after 20b engine stock produced 300 hp, maxing out at 7,000 rpm and is performance-built for 450 hp, maxing out at 9,500 rpm. With the RX7 curb weight only 2500 lbs., a 20b swap becomes very appealing.
In addition to performance-rotary swaps, many rotary builders remove the oil injection system due to its high failure rate. The rotary engine design requires constant seal lubrication to prevent overheating and seal failure. The engine oil is used to lubricate the crank internally and a mechanical pump draws the engine oil from the crank to also burn with the fuel, lubricating the apex seals during the combustion process. If the oil injection pump fails unnoticed, the effects can be catastrophic to the engine. To compensate for the removal of the injection pump, two-stroke oil is usually mixed with the fuel at very small ratios. Although there is no two-stroke oil designed for the rotary engine, many consumers use a high performance powersports oil, for example AMSOIL INTERCEPTOR Synthetic 2-Stroke Oil.
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 theEunos 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 survive. This car was pillaged for its triple-rotor, twin-turbo 20b engine and the body was trashed.This sought-after 20b engine stock produced 300 hp, maxing out at 7,000 rpm and is performance-built for 450 hp, maxing out at 9,500 rpm. With the RX7 curb weight only 2500 lbs., a 20b swap becomes very appealing.
In addition to performance-rotary swaps, many rotary builders remove the oil injection system due to its high failure rate. The rotary engine design requires constant seal lubrication to prevent overheating and seal failure. The engine oil is used to lubricate the crank internally and a mechanical pump draws the engine oil from the crank to also burn with the fuel, lubricating the apex seals during the combustion process. If the oil injection pump fails unnoticed, the effects can be catastrophic to the engine. To compensate for the removal of the injection pump, two-stroke oil is usually mixed with the fuel at very small ratios. Although there is no two-stroke oil designed for the rotary engine, many consumers use a high performance powersports oil, for example AMSOIL INTERCEPTOR Synthetic 2-Stroke Oil.
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