

⚙️ Ignite your inner engineer — build, learn, and impress with every turn!
The Mould King 10087 L4 Engine Building Kit offers 1787 pieces to construct a realistic 4-cylinder combustion engine model. Designed for teens 14+, this battery-powered STEM kit animates moving pistons, providing an immersive mechanical learning experience. With organized packaging and detailed instructions, it’s a perfect gift to develop critical thinking, motor skills, and engineering passion.








| ASIN | B0D81KL3MZ |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Best Sellers Rank | #113,985 in Toys & Games ( See Top 100 in Toys & Games ) #1,460 in Educational Science Kits |
| Customer Reviews | 4.2 4.2 out of 5 stars (439) |
| Item Weight | 4.33 pounds |
| Item model number | WX10087-JYDXHH |
| Manufacturer | Mould King |
| Manufacturer recommended age | 14 years and up |
| Product Dimensions | 12.83 x 9.21 x 5.08 inches |
D**E
A fun project but it takes patience
I got this kit for my grandson who loves Legos and anything mechanical. Putting this together was a fun challenge and a great introduction to an engines functionality. The only reason for a 4 rating vs a 5 was due to the quality of the directions. The pictorial directions did not give clear step by step visuals so several times during the assembly he had to go back and rebuild a section after carefully studying the drawing. It was still a good fun and challenging project .
A**R
Awesome Build
just started building it, after i did the v-8 which was also a very good build. 1/2 way done so far and no problems, and no pieces missing, wish they would have came out with these type of builds awhile back, building cars, ships, etc, is fun but these kits sort of changes things up, or just something different to build. i hope they keep coming out with these kits. the bricks/stones are very nice the clutch/or snap are very nice. A+ to MouldKing will buy again
A**S
Cool little project
Would recommend that you glue some pieces together because when it torques it comes apart and one part didn't fit well so had to skip it. But it works good and runs
M**E
Good toy
My kid likes it
A**R
Failed attempt, again…
This is the second or third motor I have attempted to build from mould king. In every instance, the gages that are supposed to circulate (but remain upright) never remain straight up, but instead collapse which causes the turnstiles to jam when the battery is operated. Problem? Yes, because the entire build cannot work without this. So it’s both a quick reminder that I’ve wasted both time and money on a mould king product. Thankfully this was one of the cheaper options, but still painfully frustrating. It happened after the first bag too.
D**D
Instructivo perfecto, motor funcional, de muy buena calidad los materiales
A**R
Good
Good
A**N
A Blast With Caveats
There are a lot of parts and I made some mistakes along the way, but I am thoroughly enjoying this project. There haven't been any missing parts so far, so I feel pretty confident that I'll finish without incident. I just started step 4. There are very few written instructions and some of the drawings of the connecting pins in the instructions aren't quite as clear as I would have preferred. I'm having a blast though :)
W**Y
Dit is niet ernstig. Zogezegd 535 bouwstenen in zes zakjes verpakt, zonder inventaris van hoeveel er van elke soort zouden moeten zijn. Het plan volgen lukt behoorlijk maar voor iedere "bouwsteen" is het zoeken over soms meerdere zakjes. De individuele bouwstenen hebben immers geen code. En plots blijken herhaaldelijk bouwstenen te ontbreken en wel op zo'n manier dat het geheel niet afgewerkt kan worden. Dat herhaaldelijk ontbreken van de stukken is het ergste. Halfweg (?) had ik al minstens vier keer bouwstenen te kort.
F**.
Rende davvero l' idea a grandi linee di come funziona un motore 4 cilindri
D**D
Imitation de Lego technique plutôt bien faite. Le tout s'assemble bien et le moteur fonctionne. Piles non incluses. Aucune pièce manquantes, j'en avais d'ailleurs quelques unes en plus (maillon de chaîne)
B**D
Hohe Qualität, kniffliger Aufbau, dennoch sehr empfehlenswert
W**U
Brak jednego tłoka 😭
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