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The 13B engine is widely known Mazda Wankel engine. It was produced over 30 years and offered for many Mazda's models including the RX-7 - legendary Japanese sports car. This Mazda rotary engine has a two-rotor design like its predecessor the 12A. Mazda following the tradition has left the radius of rotors unchanged (starting from the 10A engine).
- Introduction
- What Is A 20B?
- 20B Engine Specs
- Which Cars Have The 20B engine?
- How Much Is A 20B?
- 20B Upgrades & Tuning Potential
- Reliability & Common Issues
- 20B Engine Swaps
- Conclusion
- Photography Credits
When the Mazda Eunos Cosmo debuted in 1990, it became the first (and last) production Mazda to utilize the highly sought-after triple-rotor 20B-REW engine. With Mazda continuously improving upon their first attempt at the rotary engine, with the 1960’s L10 Cosmo, the Cosmo has gone on to feature the immensely sought-after 2-rotor 13B, and 3-rotor 2...
Mazda’s impressive 20B engine is the only 3-rotor production motor sold by the manufacturer. Although Mazda’s 13B-REW is often the most sought-after rotary for engine swaps, this is partly down to the rarity of the 20B, with the twin-turbo variant only ever sold within the JDM (Japanese Domestic Market) under the hood of just one car in their range...
Many believe that Mazda used the 20B-REW as a test to see how the engine fared with daily usage, potentially considering utilizing the 20B for the far more popular RX7. It’s no secret that the 20B-REW has many similarities to the much-loved 13B, with many shared components between the two, with the main differences being a second intermediate housi...
It seems like an unlikely pairing, but the only three-rotor engine to ever reach the production lines is found in Mazda’s high-end, luxury JC Eunos Cosmo coupe. Built to compete with the likes of Lexus, the four-speed automatic Cosmo initially debuted in 1990 and was at the forefront of Mazda’s luxury ‘Eunos’ range. The 3-rotor halo car was at the ...
Given that the 20B-REW was only ever found in the rare JC Eunos Cosmo, finding a second-hand motor isn’t going to be quite as simple as heading to the local yard, unfortunately. Once you’ve managed to source one, the price tag can be anyone’s guess. We’ve seen earlier models sell for around the $8,000 region, with the later Type-D models selling fo...
Given the vast differences between the 20B and the 20B-REW, the tuning potential will be significantly different. While it may be a temptation to add a turbo to the rev-happy naturally aspirated 20B race engine, you’ll have a far easier time using the 20B-REW as a base if forced induction is your goal, especially given the rarity factor of the N/A ...
There’s no secret that rotary engines require far more maintenance and special care than traditional everyday piston engines. For this reason, they’re not everyone’s first choice, but for those that are willing to put the time and effort into their rotary, they’ll be treated to one of the most exceptional engines ever designed. Once you’ve spent fa...
One of the most common 20B engine swaps is to put the 20B-REW engine into the Mazda RX7 FD. Although we’ve seen plenty of these, and you may assume it’s a simple drop-in conversion, that’s unfortunately not the case. You’ll need a specific subframe kit for the most convenient FD installation to avoid moving the transmission location. With this, you...
We hope you’ve made it this far after the eargasm-inducing videos above! With this guide, we hope we’ve explained the appeal of the 20B, as well as its fascinating history. Despite often being insanely priced, assuming you can get your hands on one, you’ll be gifted with one of the most incredible engines the world has ever seen. Sure, the 13B-REW ...
We thank the following entities for the use of their photography in this article: 1. mangopulp2008 on Flickr 2. Zero 935 on Flickr 3. FotoSleuth on Flickr
Nov 14, 2021 · The 13B engine is Mazda’s Wankel Rotary. It powered many of their models, including the RX-7 – a legendary Japanese sports car that defined rotary power for generations before them with its signature sound. The Mazda 13B rotary engine is the most widely produced, and it has been used for over 30 years. The Mazda 12A has no relation to this ...
Oct 27, 2015 · Mazda has unveiled its new RX-Vision concept. Here are its forebears ... its four rotors collectively producing a quite frankly ridiculous 600bhp. Mazda RX-7 mk3 (1991) ... and followed the 757 ...
All the Mazda rotary engines have been praised because of their light weight. The unmodified 13B-MSP Renesis Engine has a weight of 112 kg (247 lb), including all standard attachments (except the airbox, alternator, starter motor, cover, etc.), but without engine fluids (such as coolant, oil, etc.), known to make 157–175 kW (211–235 hp).
Over the years, Mazda has reduced the weight of the rotor assemblies in an effort to improve performance. Up until the introduction of the RX-8, the 1989-95 rotors were the lightest production rotors and can still be installed in the 1986-88 engines if you also include the matching front and rear counterweights.
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The abbreviation MSP is Multi Side Ports which make the engine different from its Mazda's rotary predecessors. Instead of the 13B-REW, the 13B-MSP is a naturally aspirated (NA) engine. It kept two-rotor layout with a capacity of 1308 cc (79.81 cu in), the same rotor radius and length. Each chamber volume is 654 cc.
