MX-5 Miata Engine Swap Blueprint — NA/NB Digital Guide
Build the right MX-5 — not just the most exciting engine swap.
MX-5 Miata Engine Swap Blueprint is an independent 82-page enthusiast guide for owners planning an engine conversion for an NA or NB Mazda MX-5 / Miata.
Most engine-swap research begins with the same question:
“Which engine should I put in my MX-5?”
The Blueprint starts somewhere more useful:
What should the finished car actually be?
Rather than simply listing engines and horsepower figures, this guide compares the complete conversion routes — including power, drivetrain, cooling, fuel, electronics, chassis requirements, fitment, finished cost, legality and long-term ownership.
Six MX-5 engine swap routes compared
The book examines six very different NA/NB conversion architectures:
GM Ecotec LE5 — The Rational Road Car
A lower-complexity, value-focused route for an approximately 200-hp-class naturally aspirated MX-5.
Honda K24Z3 — The Blueprint Sweet Spot
Around 200–210 whp with strong K-series character, factory-subframe retention and a mature conversion ecosystem.
Honda K24A2 — The High-Ceiling Four-Cylinder
For builders who genuinely intend to develop the car beyond the typical 200–220-whp road-car region.
Jaguar/Ford AJ30 V6 — The Character Build
Naturally aspirated V6 sound, torque and character, with a particularly strong UK enthusiast ecosystem.
GM LFX V6 — The Naturally Aspirated Super-Miata
A much larger conversion architecture aimed at roughly 300-whp naturally aspirated performance.
GM LS-family V8 — The Statement Car
For builds where V8 sound, torque and identity are part of the reason the car exists.
What you'll learn
Inside the Blueprint, you'll work through:
- How much power an MX-5 actually needs
- Why the engine is only one part of the swap
- Ecotec vs K24 and the roughly 200–220-whp road-car sweet spot
- K24Z3 vs K24A2 architecture
- V6 and V8 routes including AJ30, LFX and LS
- Finished-build budgeting rather than headline kit prices
- Gearbox, gearing, clutch and differential suitability
- Cooling, oil, fuel, exhaust and electronics planning
- Suspension, tires and brake requirements
- LHD vs RHD fitment considerations
- Build sequencing and avoiding expensive dead ends
- Reliability, serviceability and long-term ownership
The kit price is not the build price
A cheap engine does not necessarily create a cheap conversion.
A stronger gearbox is not automatically a better gearbox.
More horsepower does not automatically make a better MX-5.
The Blueprint helps you understand what each engine choice forces the rest of the car to become.
By the end, the aim is to reduce six exciting possibilities to the route that genuinely fits your:
Mission. Budget. Performance target. Geography. Appetite for complexity.
Built for real project planning
This is not just an engine comparison.
The book includes practical:
- Route comparison tables
- Power and complexity thresholds
- Finished-build budget planning
- Gearing references
- Supporting-system checklists
- Chassis setup planning
- RHD and fitment checks
- Legal and approval starting points
- Build sequencing
- Parts documentation
- A complete Master Project Worksheet
The idea is simple: make the expensive decisions before the expensive parts start arriving.
PDF + EPUB included
Your purchase includes both digital formats:
PDF Digital Edition
Ideal for tablets, laptops, desktop reading, printing worksheets and garage reference.
EPUB Edition
A reflowable version designed for phones, tablets and compatible e-readers.
82 pages • PDF + EPUB • Instant digital download
No physical product will be shipped.
Who is this guide for?
This book is for MX-5 / Miata enthusiasts who are:
- Researching their first engine swap
- Choosing between K-series, Ecotec, V6 or V8 routes
- Trying to establish a realistic finished budget
- Comparing K24Z3 against K24A2
- Considering an AJ30, LFX or LS conversion
- Planning a UK/RHD build
- Already committed to a swap and trying to avoid unnecessary complexity
It is a decision and project-planning guide, not a step-by-step installation manual.
Technical information
Information and prices checked 2 October 2026.
Supplier pricing, kit contents, product availability and regulations can change.
The Blueprint identifies areas where builders should verify the current specification against their exact:
Chassis • Steering configuration • Kit version • Location
before ordering parts or carrying out irreversible work.
The Blueprint principle
Build the least complicated MX-5 that completely satisfies the brief.
Not the least powerful.
Not necessarily the cheapest.
And certainly not the least ambitious.
The goal is to build the car that gives you everything you actually want — without paying for complexity that does nothing useful.
Stop comparing engines. Start planning the car.
Retro Outlaws
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Independent enthusiast publication. Retro Outlaws is not affiliated with or endorsed by Mazda or the other vehicle and component manufacturers referenced in this guide.