13B Rotary Engine for Sale (Mazda RX-8 Renesis, 6-Speed)

Shopping for a 13b engine that won't leave you guessing about its history? We import genuine Mazda rotary engines directly from Japan. We run every unit through a compression test and a full visual inspection before it goes on the site. Whether you're rebuilding an RX-7 or dropping one into an RX-8, this 13B rotary engine comes with real mileage, a tested block, and a seller who backs the part after it ships.

13B rotary overview

The 13B is Mazda's twin-rotor engine, and it powered the RX-7 and RX-8 for decades. It's small, light, and spins to redline in a way piston engines just can't match. That's why rotary builders keep coming back to it.

We pull ours from low-mileage cars in Japan, not from a used yard here in the States. You get a documented history instead of a guess. If you're browsing options, our Mazda Engines collection also carries turbo builds outside the rotary family, and our Mazda Transmissions page has matching gearboxes if you need a full swap.

Specifications

This listing covers the 13B Renesis rotary engine pulled from a Mazda RX-8 donor vehicle, supplied with a 6-speed manual transmission. Displacement is 1.3 L across two rotor housings. It’s the 6-port Renesis, which uses side exhaust ports rather than the peripheral ports of earlier 13B engines. Mileage is roughly 45K-55K, compression tested, with the actual figure listed on the product page.

What's included

You get the Renesis long block plus the 6-speed manual transmission as pictured, with the engine harness and accessories attached as shown in the listing photos. We don't use stock photography. What you see is the actual unit you'll receive.

13B vs 13B-REW vs Renesis

Not all 13B engines are the same, and mixing them up is an easy way to buy the wrong part. The naturally aspirated 13B is the base rotary found in early RX-7s. The 13B-REW is the sequential twin turbo version out of the FD RX-7, and it's the one most builders chase for power. The 13B Renesis came later in the RX-8, uses side ports instead of peripheral ports, and pairs with either a 6-speed manual or automatic. Know which chassis you're building for before you order, since these three don't bolt in interchangeably.

Fitment & compatibility

This engine fits Mazda RX-7 and RX-8 applications, depending on the specific variant listed. Always check your chassis code and generation against the listing details, or reach out to our team before you buy if you're not sure.

Inspection, warranty & shipping

Every engine we sell gets compression tested and visually inspected before it's listed. Each listing states the real mileage pulled from the donor vehicle in Japan. Your purchase comes with our 90-day limited warranty, which is longer than what most rotary sellers offer. We ship nationwide from our facility, and JDM State Motors of NC LLC is a registered North Carolina company based in Garner, so you're buying from a real business, not a private reseller.

Ready to move forward? Add this 13B engine to your cart, browse our full Mazda Engines and Mazda Transmissions inventory for a matching gearbox, or contact our team if you need help confirming fitment before you order.

FAQs

What is a 13B rotary engine?

The 13B is a twin-rotor Wankel engine built by Mazda for the RX-7 and RX-8. It's compact, lightweight, and known for revving far higher than a typical piston engine.

What's the difference between a 13B and a 13B-REW?

The 13B-REW is the twin-turbo version of the 13B, built specifically for the FD generation RX-7. The standard 13B is naturally aspirated and came in earlier RX-7 models.

Is the 13B Renesis the same as a 13B-REW?

No. The Renesis is the RX-8 version of the 13B and uses side exhaust ports instead of the peripheral ports found in earlier 13B engines. It's not a direct swap for RX-7 turbo applications.

Do you perform a compression test on every engine?

Yes. Every engine we sell, including this 13B, is compression tested and visually inspected before it's listed for sale.

Where do your 13B engines come from?

We import them directly from Japan. Each listing states the actual mileage pulled from the donor vehicle.

What warranty comes with this engine?

We include a 90-day limited warranty on this 13B engine, backed by JDM State Motors of NC LLC, a registered North Carolina company in Garner.

Do you ship nationwide?

Yes. We ship across the United States. Contact our team if you need a shipping quote to your location before you buy.