It was an interesting very g ood build. Just wish it had lights to top it off.
L4 Mechanical Engine 931PCS
★★★★★
4.9 · 2,400+ reviews
$126.00
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Description
L4 Mechanical Engine 931PCS
It runs, it smokes, and it makes the noise.
Bring mechanical engineering to life with the L4 Mechanical Engine, a detailed 931-piece build designed to deliver an immersive and interactive engine experience.
Power it on and watch the four electric pistons move through the inline-four cylinder bank while the built-in sound module produces realistic engine sounds. The integrated vapor system adds another layer of realism, sending mist through the polished chrome exhaust for an impressive running effect.
A four-speed gear selector operates the visible electric gear linkage, allowing you to explore the transmission mechanics while the entire engine sits securely on a dedicated display base with a printed nameplate.
Finished with bronze cam covers, silver casing, braided detailing and a sweeping chrome exhaust header, this compact engine is as impressive to display as it is to operate.
Build the engine. Start the machine. Watch it come alive.
Dimensions
25.5 cm × 19 cm × 20.7 cm
10.04 in × 7.48 in × 8.15 in
Key Features:
931 Pieces
Electric Piston Movement
Inline-Four Engine Design
Built-In Engine Sound Effects
Vapor Smoke Effect
Chrome Exhaust System
Four-Speed Gear Selector
Visible Electric Gear Linkage
Bronze Cam Covers
Silver Engine Casing
Braided Line Detailing
Swept Chrome Header
Display Base with Printed Nameplate
7-Cell Battery Box
L Motor Included
Sound Module Included
Sprayer Unit Included
Pre-Sorted Numbered Bags
Fully Illustrated Step-by-Step Instruction Manual
Shipping & Returns
Free Worldwide Shipping — All orders ship free. Delivery takes 3–10 days.
Returns & Replacements — Contact support@gobuildit.co and we will find the best solution.
$126.00
No Hidden Fees
What you see is what you pay.
Tracked Delivery
Every order includes full tracking from dispatch to delivery.
Safe Checkout
Your payment is secure and protected at every step.
24/7 Customer Support
Fast, friendly assistance whenever you need it .
Build Experience
Built to Be Seen
Now building
L4 Mechanical Engine
Every detail engineered to reward the builder who demands more. Precision parts, clear instructions, a finish built to display.
🎁 Free mystery gift included with every order
Pieces
931
Build Time
3–5 hours
Difficulty
Intermediate
Dimensions (cm)
25.5 cm × 19 cm × 20.7 cm
Dimensions (in)
10.04 in × 7.48 in × 8.15 in
Instructions
Manual (Paper) / PDF
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Built to drive. Built to display. Built to impress.
01
Precision Engineering
931 precision pieces — every one numbered, sorted and engineered to fit perfectly.
02
Mechanical Detail
Around 3–5 hours of focused building — a proper challenge that rewards patience with a result worth displaying.
03
Built to Display
At 10.04 in × 7.48 in × 8.15 in, this is a statement piece — built to sit on a shelf and start conversations for years.
Why Builders Choose GoBuildIt.
Customer Reviews
Overall rating: 4.7 / 5 from 131 reviews.
Really loved building this model kit. Very satisfying.
Tough to get sections together, got down to the end missing a couple of small connectors so couldn’t install crane hook.
not done yet, but really enjoy it so far
Product is absolutely phenomenal. Genuinely challenging, but rewarding build. But that’s on CaDa, no buildit. Customer experience through this site is horrendous. Car arrived all bags loose in a plain box - not the actual product box. This is a premium product and the box means a lot to me. Customer service response? “It’s ok all parts are there.” Had a broken piece, by the time customer service actually responded, I had already purchased, received and fitted a new part myself. Again, the product itself is outstanding.
German GT3 Racing Edition 5466PCS
Store owner replied: Thank you for taking the time to share such detailed and honest feedback. We’re really glad you enjoyed the build and found the car challenging and rewarding. We’re genuinely sorry that your experience with the packaging and customer service fell short of expectations. We understand that for a premium product, the presentation and original box can be an important part of the experience, and our response regarding the missing/broken piece should have been much more helpful. Your feedback has been noted, and we’ll work to improve both our packaging and support experience. We truly appreciate you giving GoBuildIt a chance and are glad the product itself lived up to your expectations.
Great looking bike easy instructions
Great product, fun to build.
Great product, fun build. Loved it.
Great looking bike easy to follow instructions
Good product with easy to follow instructions.
Ser fantastisk ut!
Gold Astronaut Cosmic Explorer 992PCS
Store owner replied: Thank you so much! 🙌 We’re glad you love the look of it. Enjoy your build, and happy building! 🔥
I had a real hard time with the parts that framed the outside skin. They wouldn’t stay locked and it kept falling over and falling over and falling over and I tried gluing them, and that didn’t work, so I got frustrated the threw the thing away. I really wish I could’ve built it. I really wanted that pretty bad. I spent a lot of money on it too.
Store owner replied: Thank you for sharing your experience. We’re really sorry to hear you had such a frustrating time with the build. The outer frame requires the pieces to be assembled in the correct sequence and positioned exactly as shown in the instructions, as even a small difference can affect how securely everything locks together. We understand how frustrating that must have been, especially after putting so much time and money into it. We truly wish you had contacted us before giving up, as we would have been happy to help you through the difficult section.
I enjoyed building the model.
Store owner replied: Thank you for your feedback! 🙌 We’re glad you enjoyed building the model. Happy building, and we hope you enjoy your next GoBuildIt™ build! 🔥
Great build had a lot of fun
Store owner replied: Thank you so much! 🙌 We’re glad you had a lot of fun with the build. Happy building, and we hope you enjoy your next GoBuildIt™ model! 🔥
Fun build, good instructions. Went together very well
1970s Cabover Aerodyne Truck 2180PCS
Store owner replied: Thank you for the great feedback! 🙌 We’re glad you enjoyed the build and found the instructions easy to follow. Happy building, and we hope you enjoy your next GoBuildIt™ build! 🔥
Har ej byggt den än modellen är fin
Store owner replied: Thank you for your feedback! 🙌 We’re glad you like the look of the model. We hope you enjoy the build when you get started! Happy building! 🔥
Bag packaging was not super accurate. Instructions were very vague at times, or did not contain enough steps
This was my most fun build to date.
Store owner replied: We're thrilled to hear this was your most enjoyable build yet. We hope your next GoBuildIt™ model is just as much fun—happy building! 🔥
Terrible customer service, order had to be changed after weeks only to find out oroduct was out of stock. The first or 2 i received already has missing parts and poor quality instructions. Never deal with this company.
Interesting Concept, but the Instructions Left Me Confused This was my first building set from this company, and unfortunately I never quite got along with the instructions. For some reason, only the parts added in the current step are shown in color while everything else is displayed in gray. That worked well enough for the vase, but once I started building the flower stems, things quickly went off the rails. At some point, my Epiphyllum bouquet began to resemble a rather unfortunate mutant monster instead of a flower arrangement. I rebuilt it three separate times, convinced I had missed something, but each attempt led me to the same confusing result. In the end, I gave up on following the instructions exactly and built several sections by intuition instead. Surprisingly, that got me much closer to what the finished model was supposed to look like. While this is not the best-looking or most impressive brick-built display piece I've made, I still enjoyed the experience. It was fun to try something different, and I'm glad I gave this brand a chance. I probably won't keep it on display for very long, but it was an interesting build and a worthwhile experiment nonetheless.
Store owner replied: Thank you for taking the time to share such detailed feedback! 🙌 We’re glad you enjoyed trying something different and that you ultimately found the build rewarding. We also appreciate your comments about the instructions—they’re valuable to us and help us improve the building experience for future releases. Thank you for giving GoBuildIt™ a chance, and we hope your next build with us is an even smoother one!
Cool 😎
Classic Vintage Model Car 3564PCS
Store owner replied: Glad you liked it! 😎
Was a great challenge kept me busy for a couple of days was worth waiting for
Bien le bonjour pas de photos elle est en cour de montage avec mon petit fils
I haven't given to my oldest grandson yet ( 11 ). In October I'll be in NC to give it to him.
Top je recommande 👌🏼
Top je recommande 👌🏼
Ordered the satin blue and got the silver🥲
Just started but so far so good
Models good and fits together well. Great addition to the collection.
It was a good build. Had it's challenges. But I really enjoyed it
Store owner replied: Thank you for your feedback! 🙌 We’re glad you enjoyed the build, even with a few challenges along the way. That’s what makes finishing the model even more rewarding! 🔥
The unique blue color scheme makes it look so cool overall... full of details and highly restores the real car.
Store owner replied: Thank you so much for your feedback! 🙌 We’re glad you loved the unique blue color and the attention to detail. It’s great to hear that the finished build captures the look of the real car! 🔥
Havent completed it yet. Instructions aren't the most clear. The bags that contain the parts to build could be marked better and coincide with the Instructions to make things go more smoothly.
I truly enjoyed building this model. Especially the detail. Pieces fit tightly. This allows handling the model without pieces coming apart or falling off.
Store owner replied: We’re glad you enjoyed the detailed build and the secure fit of the pieces. Enjoy your model, and we hope to see you back for your next GoBuildIt™ build! 🔥
geen commentaar. Dit is een bouwdoos voor gevorderde bouwers.
Catalina Seaplane PBY-5A 364PCS
Store owner replied: Bedankt voor je feedback! 🙌 We zijn blij dat je de set hebt gewaardeerd. Inderdaad, dit model is ontworpen voor ervaren bouwers die van een uitdagende en gedetailleerde bouwervaring houden. Veel bouwplezier! 🔥
Love the project. The pieces were sometimes snugger than they should be which made refitting pieces sometimes hard. Beyond that - I loved it!
Very Fast Shipping and Great Communication
So I absolutely LOVED this build. The pieces are amazing quality on par with Lego. The Neptune blue pieces used for the body are gorgeous and the over all build is sturdy and huge! I would have definitely given it 5 stars but unfortunately it was missing some of the motors. I reached out to them and the customer service was very nice and professional and maybe they are still working on getting them to me but it has been almost a month since I reached out and it has been 2 weeks since they have responded to my emails. If I receive the missing parts I will come back and give it 5 stars.
Excellent brick-building experience from start to finish! Delivery was fast, everything arrived in perfect condition, and the quality of the model exceeded my expectations. The instructions were clear, the bricks fit perfectly, and the final result looks incredible. Many thanks!
Widebody German Supercar 3388PCS
Store owner replied: Thank you so much for this amazing feedback! We’re thrilled to hear that everything from the delivery to the final build exceeded your expectations. It’s great to know you enjoyed the quality, clear instructions, and overall building experience. Enjoy your finished model, and thank you again for supporting GoBuildIt™ — we can’t wait to be part of your next build!
Enjoying the build this far.
Incredible build. Can't wait to build more
German GT3 Racing Edition 5466PCS
Store owner replied: Thank you so much! 🙌 We’re thrilled to hear you enjoyed the build experience. We can’t wait for you to start your next project with GoBuildIt™—there’s plenty more exciting builds ahead!
Everything you need to know before starting your build.
Frequently Asked Questions
What's included in the box ?
What's included in the box ?
Each GoBuildIt kit includes all premium bricks, clear digital PDF instructions, and a special gift — everything you need to enjoy a build that brings joy, happiness, and memorable moments, whether you build alone or share the experience with someone you love.
Are instructions included ?
Are instructions included ?
Yes. All GoBuildIt kits come with digital PDF instructions.
They are clear, step-by-step, and optimized for phone, tablet, and desktop — no paper manuals needed.
What if a piece is missing?
What if a piece is missing?
We offer a Missing Piece Guarantee.
If a piece is missing, simply contact our support team and we'll replace it quickly and free of hassle.
Are GoBuildIt kits compatible with other building bricks ?
Are GoBuildIt kits compatible with other building bricks ?
Yes. GoBuildIt bricks are fully compatible with standard building brick systems, allowing you to combine and expand your builds freely.
How difficult are the builds?
How difficult are the builds?
Each product clearly displays its difficulty level.
Our kits are designed to be challenging and rewarding, suitable for both intermediate and experienced builders. Beginners are also welcome with patience and focus.
Are these kits for kids or adults?
Are these kits for kids or adults?
GoBuildIt kits are designed primarily for teens and adults who enjoy detailed, focused builds.
Some kits may be suitable for younger builders with supervision.
Do you ship internationally?
Do you ship internationally?
Yes, we ship worldwide.
Shipping times and costs are displayed at checkout based on your location.
Who can I contact if I need help?
Who can I contact if I need help?
Our support team is available to help before, during, and after your build.
Just reach out through our contact page — we're happy to assist.
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