This is a Mazda 13B rotary engine for sale in fairly used condition. It is a complete twin-rotor engine, taken from a running car, compression tested with a proper rotary tester and ready to ship to you anywhere in the world. The 13B powered the RX-7 and RX-8 for decades, and there is nothing else that sounds or revs quite like it.
Rotary engines are different, so buying one is different. We match the engine to your car, send photos of the actual engine and give you the compression reading for every rotor face before you pay.
What Comes With This Mazda 13B Rotary Engine for Sale
A complete engine normally includes:
- Front, intermediate and rear housings with both rotors
- Eccentric shaft, front cover and oil pan
- Intake manifold, throttle body, fuel rails and injectors
- Oil metering pump and lines
- Ignition coils where fitted
- Twin turbos and pipework on 13B-REW engines, when ordered
- Photos, compression readings and secure packing
Alternators, AC compressors, wiring and engine computers vary. Your quote lists exactly what comes with the Mazda 13B rotary engine for sale you are buying.
Mazda 13B Rotary Engine Specifications
| Type | Twin-rotor Wankel rotary, petrol |
| Displacement | 1,308 cc (654 cc x 2 rotors) |
| Rotor width | 80 mm |
| Spark plugs | 2 per rotor (leading and trailing) |
| 13B-DEI (FC RX-7) | About 146 to 160 hp |
| 13B-T (FC Turbo II) | About 182 to 215 hp |
| 13B-REW (FD RX-7) | About 252 to 280 PS, twin sequential turbos |
| 13B-MSP Renesis (RX-8) | About 189 to 238 hp |
| Redline | About 7,000 to 9,000 rpm, depending on version |
| Lubrication | Oil metering pump feeds oil into the housings, so some oil use is normal |
| Cooling | Liquid |
| Condition | Fairly used, compression tested |
Want the full story first? Read our Mazda 13B rotary buying guide.
To understand how the engine works, read about the Wankel engine, and for Mazda’s history with it, see Mazda Wankel engines.
The 13B Versions
13B-DEI. The naturally aspirated engine from the FC RX-7, about 1986 to 1991. Simple and fairly cheap.
13B-T. The turbo engine from the FC Turbo II. A favourite for budget builds.
13B-REW. The twin sequential turbo engine from the FD RX-7, about 1992 to 2002. This is the Mazda 13B rotary engine for sale most people ask us for, and the price on this page is for this version.
13B-MSP Renesis. The RX-8 engine with side exhaust ports, in 4-port and 6-port form. Usually cheaper and quoted separately.
These versions do not simply swap between cars. The wiring, engine computer, intake and mounts are all different. Before you order any Mazda 13B rotary engine for sale, tell us the car and chassis code and we will match it.
Vehicles This Mazda 13B Rotary Engine for Sale Fits
- Mazda RX-7 FC (about 1986 to 1991)
- Mazda RX-7 FD (about 1992 to 2002)
- Mazda RX-8 (about 2003 to 2012)
- Mazda Cosmo and older Luce models in some markets
- Swap builds into earlier RX-7s, RX-3s and other light cars
How We Test a Rotary
A normal piston compression gauge tells you almost nothing on a rotary. Each rotor has three faces, and each face needs its own reading. We test with a rotary compression tester at cranking speed and give you the reading for all six faces, adjusted to a standard cranking speed. Low or uneven numbers point to worn apex seals, and you will see that before you pay, not after.
- Compression reading for all six rotor faces
- Check oil and coolant for mixing
- Look for signs of overheating on the housings
- Turn the eccentric shaft by hand and feel for roughness
- Check turbos for shaft play on 13B-REW engines
- Photograph the engine from every side
- Seal the ports and pack for transport
That is how we make sure every Mazda 13B rotary engine for sale is worth its price. More on our process in tested used engines.
What Fairly Used Means
Fairly used means the engine came from a car that was running, not from a fire or flood. It has normal wear for its age, it is not rebuilt and it is priced as a used engine. Anything we find, like a weeping oil line or a cracked vacuum hose, goes in your notes, so the Mazda 13B rotary engine for sale that arrives is exactly the one we described.
Known 13B Weak Points
- Apex seals. Wear shows up as low compression and hard hot starts. That is what our face readings check for.
- Coolant seals. Overheating can damage the O-rings between the housings, causing white smoke and coolant loss. A healthy cooling system is a must.
- Flooding. RX-8 engines can flood if started cold and switched off straight away.
- Ignition coils. Weak coils cause misfires and can hurt the engine over time. Replace them if the history is unknown.
- Turbo and vacuum hoses. The FD twin turbo system has a lot of small hoses that crack with age.
Rotary owners know all this. It is part of the deal, and it is why you should only buy a Mazda 13B rotary engine for sale that comes with real test numbers.
Price and What Affects It
The price shown on this Mazda 13B rotary engine for sale is for a complete, fairly used 13B-REW. The final price can change with:
- Version: 13B-DEI, 13B-T, 13B-REW or Renesis
- Compression readings and mileage
- Whether turbos, computer and wiring are included
- Shipping method and destination
Your quote shows the engine, extras and freight separately. Our replacement engine cost guide helps you plan the rest.
Used, Rebuilt or Remanufactured?
A fairly used engine with good compression is the quickest and cheapest route. Rotary rebuilds are a specialist job and cost a lot more. Our guide to remanufactured vs rebuilt engines explains the difference. If you plan a big power build anyway, a good used core is still a smart place to start.
Fitting Advice
- Find out why the old engine failed. On rotaries it is very often overheating.
- Fit a good radiator, new hoses and a new thermostat.
- Fit new spark plugs and coils if their age is unknown.
- Check the oil metering pump lines and the fuel injectors.
- Prime the engine with oil before the first start.
- Use the right oil, and many owners add a little two-stroke premix to the fuel.
Get those basics right and the Mazda 13B rotary engine for sale you fit will reward you.
Living With a Rotary
Check the oil level often, because a healthy rotary uses some. Let it warm up fully and do not switch it off cold. Use the revs regularly, as a rotary that is always driven gently tends to carbon up. Keep the cooling system perfect. Do that and a Mazda 13B rotary engine for sale from us will give you plenty of smooth, high-revving miles.
For Workshops and Importers
We can quote several engines at once and ship them together to save on freight. Rotary specialists often pair a Mazda 13B rotary engine for sale with other JDM performance engines for their customers. Every engine is labelled with its number and quote reference, with photos and compression readings.
Warranty
Every Mazda 13B rotary engine for sale ships with a written warranty, with the terms on your quote. See our used engine warranty page and our refund and returns policy.
Worldwide Shipping
We ship to North, Central and South America, the Caribbean, Europe, Africa, the Middle East, Asia, Australia and the Pacific, by sea or air. Each Mazda 13B rotary engine for sale is drained, sealed, strapped down and packed in a crate or on a pallet, then shipped with tracking and export paperwork. Read our shipping policy.
How to Order
- Send your car and chassis code through the contact page, or call +1 (209) 733-0882.
- We confirm the right version and send photos and compression readings.
- You get a written quote with engine, extras and shipping.
- Pay by bank transfer. It is the only payment method we accept. See our billing terms.
- We ship with tracking and send the documents.
Read how to buy a used engine online for more tips.
When Your Engine Arrives
- Photograph the crate before opening it.
- Check the number on your Mazda 13B rotary engine for sale matches your quote.
- Make sure all the listed parts are there.
- Turn the eccentric shaft by hand.
- Contact us within the time on your quote if anything is wrong.
More JDM Engines
Browse our full range of used engines. Other JDM favourites include the Toyota 2JZ, the Nissan SR20DET, the Mitsubishi 4G63T and the Honda B18C. Learn more about us.
Frequently Asked Questions
Is this a new engine?
No. It is a fairly used, compression tested engine from a running car.
Which version is this Mazda 13B rotary engine for sale?
The listed price is for a 13B-REW from an FD RX-7. We also quote 13B-DEI, 13B-T and Renesis engines.
Can I put a 13B-REW in an RX-8?
It can be done, but it needs a lot of custom work. Replacing like with like is far simpler.
Is it normal for a rotary to use oil?
Yes. The engine injects oil to lubricate the seals, so check the level often.
Is there a warranty?
Yes, a written warranty with the terms on your quote.
How do I pay?
Bank transfer only.
Do you ship to my country?
Yes, worldwide by sea or air with tracking.
Get Your Quote
If your RX-7 or RX-8 has lost compression or blown a coolant seal, this is how you get it back on the road. Send us your car and we will confirm the match, send photos and readings and give you a clear price on a tested Mazda 13B rotary engine for sale, delivered wherever you are.
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