Discovery MindBlown Model Engine Kit: What's in the Box and the Alternatives
The Discovery model engine kit, sold under the Discovery Kids and #MINDBLOWN names, is one of the most searched-for engine kits for children: a plastic four-cylinder car engine that a child builds and then watches run on batteries. Here is what is in the box, what each part does in a real engine, who the kit suits, and what to buy instead when it is too simple.
Quick Comparison
Jump to the product that fits your needs
| # | Product | Rating | Pieces | Power | |
|---|---|---|---|---|---|
| #1 | Discovery Model Engine Building Kit (Four-Cylinder)The Kit | 150 | Battery pack (batteries not included) | See details ↓ | |
| #2 | Playz Large V8 Engine Model KitSame Age, Bigger Engine | — | Battery and motor | See details ↓ | |
| #3 | Revell 85-8883 Visible V8 EngineThe Classic Step Up | 314 | Hand crank | See details ↓ | |
| #4 | BseSparklion Inline-Four Diesel (1,029 pieces)For Teens Who Like Bricks | 1029 | Motor | See details ↓ | |
| #5 | TECHING DM115 Four-Cylinder DieselThe Metal Version | 300 | 3.7V battery (USB) | See details ↓ |
Discovery Model Engine Building Kit (Four-Cylinder)
Playz Large V8 Engine Model Kit
Revell 85-8883 Visible V8 Engine
BseSparklion Inline-Four Diesel (1,029 pieces)
TECHING DM115 Four-Cylinder Diesel
What Is in the Box
The kit's parts list, as published by its sellers, runs to about 150 pieces: 83 engine parts and 67 screws. Grouped by what they do in a real engine:
| System | Parts in the kit | What it does in a real engine |
|---|---|---|
| Bottom end | Crankshaft, 4 connecting rods with big-end keepers, 8 piston halves, 4 piston pins, 5 bearings, lower crankcase, oil pan, dipstick | The pistons are pushed down by the burning fuel; the connecting rods turn that up-and-down motion into the crankshaft's rotation. |
| Cylinder block and head | Cylinder block, head gasket, lower cylinder head, rocker arm cover | The block holds the four cylinders; the head closes them off and carries the valves. |
| Valvetrain | 8 timing cams, 8 rocker arms, 8 valve springs, timing gear, timing wheel, timing belt, belt tensioner, timing belt cover | The crankshaft drives the cams through the timing belt; the cams push the rocker arms, which open the intake and exhaust valves at the right moment. Eight valves means two per cylinder. |
| Intake and exhaust | Carburettor bowl and cover, intake manifold, exhaust manifold | The carburettor mixes air and fuel; the manifolds carry the mixture in and the exhaust out. |
| Cooling | Two-part water pump, fan, fan pulley, crankshaft pulley, fan belt | The crankshaft drives the fan and the water pump through the fan belt. |
| Ignition | Distributor assembly | Sends the spark to each cylinder in turn. |
| Drivetrain | Flywheel clutch, clutch housing | Smooths the engine's rotation and connects it to the gearbox. |
| Model only | Drive module, battery pack, engine stand, positioning jig, 2 shafts, 2 washers, 67 screws | The drive module turns the engine; the jig helps line parts up during the build. |
That is the real value of the kit: nearly every major system of a car engine has a part a child can hold, fit and then watch move.
How It Works Once Built
Nothing burns. A battery-driven module turns the engine, and the crankshaft, timing belt, cams, rocker arms, valves, fan belt and fan all follow, just as they would in a running engine. The listing titles mention LED lights. Batteries are not included.
Because the pistons are driven by the crankshaft rather than the other way round, the model shows the motion of a four-stroke engine, but not the force. That is true of every motorised display engine, including the far more expensive metal ones. For the theory, our guide to building block vs metal engine kits explains what each kind of model teaches.
Who It Suits
Ages 8 to about 12. The kit is rated 8+, and with screws rather than glue or bricks, it suits a child who likes taking things apart and putting them together. Younger builders will want an adult to help with the 67 screws and the timing belt.
A parent and child. The parts map closely to a real engine, so it works well as a shared project with someone who can explain what each part does.
Not for an adult enthusiast. It is a plastic educational model, not a scale replica. Adults are better served by the Revell Visible V8, a brick engine, or a metal kit.
Two Names, Two Listings
The kit has been sold as the Discovery Kids DIY Toy Model Engine Kit and later under Discovery's #MINDBLOWN brand, and Amazon carries it under both: the Discovery listing above, and a #MINDBLOWN DIY Model Engine Kit listing. Both describe a four-cycle car engine with valves, cylinders and hardware. Check the live price and availability of each; when one is out of stock, the other often is not.
The Alternatives
- Same age, bigger engine: the Playz V8, also rated 8+.
- The classic next step: the Revell Visible V8, with a hand crank and transparent parts.
- For a teen who likes bricks: the BseSparklion inline-four diesel, 1,029 pieces.
- The metal version, a few years later: the TECHING DM115, rated 14+.
More kits for every age are in our best visible engine model kits, best building block engine kits and the searchable model engine kit database.
What We Could Not Verify
We have not built this kit. Its specifications come from its sellers:
- The parts list is taken from a retailer's copy of the Discovery Kids listing (MerchSource part number 1006975). We could not confirm that the #MINDBLOWN edition contains exactly the same parts.
- Battery type and count are not given in the sources we could read; the listings say only that batteries are not included.
- The LED lights are mentioned in the listing titles, but not in the parts list, so we cannot say where they are.
- Build time and size are not published by the sellers we could read.
- Amazon listings load their details in a way we could not read in full, so we confirmed the kit by its listing titles. The Revell, Playz and BseSparklion kits were checked the same way; the TECHING figures come from Stirlingkit's product data, checked October 1, 2026.
Detailed Reviews
Discovery Model Engine Building Kit (Four-Cylinder)
A plastic four-cylinder model of a classic four-stroke petrol car engine, built from about 150 parts including 67 screws. A battery-driven module turns the crankshaft, so the pistons, valves, belts and fan all move once it is built, and the listing title promises LED lights. Made by MerchSource under the Discovery Kids brand, for ages 8 and up.
Key Features
- Four cylinders, eight valves
- About 150 parts, 67 of them screws
- Battery-driven; batteries not included
- Plastic, with engine stand
- Ages 8+
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Playz Large V8 Engine Model Kit
If the child wants a V8 rather than a four-cylinder, this building-block V8 is rated for the same age, 8 and up, and also runs on a battery and motor once built.
Key Features
- Building-block V8
- Battery-powered motor
- Rated 8+
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Revell 85-8883 Visible V8 Engine
Revell's Visible V8 is the classic plastic engine kit: a 1:4-scale, 314-piece V8 about 12 inches long, with transparent parts. Turning the hand crank moves the crankshaft, pistons, camshaft, rockers and valves. Revell rates it skill level 5, so it is a project for an older child with patience, or for a parent and child together.
Key Features
- 314 pieces, 1:4 scale
- Hand crank, no batteries
- Transparent parts, stand included
- Revell skill level 5
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BseSparklion Inline-Four Diesel (1,029 pieces)
The same inline-four layout as the Discovery kit, but as a 1,029-piece Lego-compatible brick build with a motor, sold for teens and adults. A longer, more absorbing build for a child who has outgrown screws-and-plastic kits.
Key Features
- 1,029 pieces, Lego-compatible
- Inline-four with motor
- Sold for teens and adults
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TECHING DM115 Four-Cylinder Diesel
An inline four-cylinder again, this time in 300+ stainless steel and aluminium parts at 1/10 scale, with a visible overhead valvetrain and about an hour of running per charge. About four hours to build and rated 14+: the kit to give the same child a few years later.
Key Features
- 300+ metal parts, 1/10 scale
- Motor-driven: USB or battery
- About 4 hours to build, rated 14+
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Six see-through engine kits compared: Revell's Visible V8, three Franzis Porsche and BMW engines, a brick V8 and a kids' kit. What moves them, what you see, and how long they take. Checked September 2026.
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Our top pick
Discovery Model Engine Building Kit (Four-Cylinder)