EnginesDIY

WORKING ENGINE MODELS · METAL DIY KITS

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V8 & MULTI-CYLINDER

Internal Combustion Engine Models

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CISON L4-175 17.5cc OHV Inline-4 Gasoline Engine

CISON L4-175 17.5cc OHV Inline-4 Gasoline Engine is a compact 17.5cc OHV inline-four working engine offered in kit and pre-assembled red or blue confi..

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$979.99 $2,109.43

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CISON FL4-175 17.5cc Flathead Inline-4 Engine Model

CISON FL4-175 17.5cc Flathead Inline-4 Engine Model is a low-profile 17.5cc side-valve inline-four gasoline platform offered as a kit or assembled eng..

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$979.99 $2,008.98

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H75 12cc OHV Inline-4 Tractor Engine Model

H75 12cc OHV Inline-4 Tractor Engine Model is a complete heritage-style 12cc inline-four OHV gasoline engine system with radiator, mechanical speed co..

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$1,469.99 $3,013.48

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CISON / RETROL L100 Single-Cylinder Gasoline Engine Model

CISON / RETROL L100 Single-Cylinder Gasoline Engine Model is a compact L100-series four-stroke platform offered in CISON and RETROL configurations wit..

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$440.99 $904.03

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R90S 3.2cc Boxer-Twin Motorcycle Engine Model

R90S 3.2cc Boxer-Twin Motorcycle Engine Model is a compact 3.2cc horizontally opposed twin-cylinder gasoline model inspired by classic boxer-motorcycl..

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$783.99 $1,607.18

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Built for people who want to know how machines work

Engineering detail, presented with collector-grade clarity.

Every collection is organized by mechanism and operating method, so you can compare assembly complexity, material, scale, power source and display purpose without guessing. EnginesDIY is designed to help builders choose confidently—not simply browse more products.

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Compare visible mechanisms, assembly formats and operating styles—from compact Stirling demonstrations to multi-cylinder combustion and aviation-inspired builds.

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Model Engine Kits

Detailed metal builds with visible moving parts for makers, collectors and engineering enthusiasts.

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Working internal combustion engine model with visible cylinders

Working power

Internal Combustion Models

Piston-engine models organized by cylinder layout, operating format and mechanical detail.

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Steam power

Steam Engine Models

Classic steam mechanisms for operation, learning and display.

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Flying bird single-cylinder Stirling engine model

Heat driven

Stirling Engine Kits

External-combustion demonstrations that turn heat into visible motion.

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Aviation

Turbofan & Jet Engine Kits

Compressor, turbine and aircraft-engine structures shown in precision detail.

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Hit and miss engine model with exposed flywheel

Heritage mechanics

Hit & Miss Engines

Collectible stationary mechanisms with exposed flywheels and governors.

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Five-cylinder radial aircraft engine model kit

Radial layout

Radial Engine Kits

Aircraft-inspired radial mechanisms built around a visible central crank.

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Twin cylinder

Motorcycle & V-Twin Engines

V-twin, boxer-twin and compact two-cylinder working models.

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Inline four-cylinder DOHC working engine model

Multi-cylinder

Inline Engine Models

Inline-two and inline-four layouts with DOHC, OHV and flathead designs.

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Working tractor-style stationary engine model

Stationary power

Tractor & Stationary Engines

Heritage powerplants with visible flywheels, governors and utility-engine form.

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What are people saying about us

Arrived early, packaged perfectly, beautiful model and a very well received gift for my car enthusiast OH he is over the moon with it

- charlibaltimore

This is the 8th model I have built from this company, and once again I'm completely satisfied. It is beautiful and the workmanship is wonderful, I highly recommend it.

- chromebandit

Have build many of these, and for a plastic model, this is one of the best. All parts were included and assembled model runs perfectly. For the price, can't be beat.

- kellyhorne

Very well made and detailed. Instructions were a little to non understandable but made out. Surprised all the parts where there, only the switch hold down but was missing

- TBNWorld

I was looking for something challenging and I didn't want to be able to finish it in a day or two. This was perfect. I worked on it a little here and a little there and it took a few weeks to finish and that was exactly what I wanted this to be.

- sacredcirclegifts

High quality, great instructions and fun to build. It took me a little onger than spec'd but i would not have minded it being even longer. This is my first model. I hope there are comparable projects like this.

- thewiltingwick

Love the V8. I ran in a small issue and contacted consumer services. Very responsive and I am completely satisfied. Looking forward to my next purchase.

- DocDisco81

Bought as a gift for an older gentleman and he loved it..all metal pieces and so easy to put together..the instruction manual was easy to read. Just wish there was more like this.

- janmakuc

Very much fun to build. All metal parts fit precise and the manual has for each building step easy to understand drawings and descriptions. The model engine looks great and also works well.

- graigkarl

It was a present for my brother who graduated in mechanical engineering! He simple loved! It was perfect!

- lloydstoltz