V8 Functional Engine Model | DOHC version

Desctiption

This project is a fully functional V8 DOHC engine model designed for 3D printing.

It features a realistic dual overhead camshaft layout with an advanced three-loop timing chain system, moving pistons and valves, and a correct V8 firing order.

The model is designed as a mechanical assembly, not a static display — all major components move and interact, closely reflecting real combustion engine kinematics.

• Dimentions: ~200 mm x 170 mm x 100mm

• Estimated printing time (0.16mm): ~22h

• Estimated filament usage: ~400g

🔧 Key Features

• Fully functional DOHC valvetrain (intake and exhaust camshafts per cylinder bank)

• Advanced three-loop timing chain system

• Moving crankshaft, pistons and valves

• Correct firing order: 1-8-4-3-6-5-7-2

• Chain-driven timing system with tensioner and guides

• Can be rotated manually or powered by a DC motor

• Designed around standard 606 and 608 bearings (printable bearing models included) and metric M3 / M4 screws

📦 What’s Included

• Complete set of printable parts (.3mf files with optimized orientations)

• Detailed step-by-step assembly instructions with exploded views

• Printing guidelines and troubleshooting tips

• All files are prepared to make printing and assembly as straightforward as possible.

🔩 Assembly & Hardware

The model is assembled using standard metric hardware:

• Bearings: 9x 606, 2x 608 (commercial recommended, printable versions included)

• Screws: M3 / M4 with nuts (23 pcs, 10, 16, 20, 25mm lenght, exact list provided in the instruction)

• DC motor: TT type, geared , 48:1 ratio - Optional.

No special tools are required beyond basic hand tools.

🖨 Printing Notes

Most components are designed to print without supports.

Selected parts such as camshafts, crankshaft and valves require specific orientations and supports — all critical details are clearly explained in the assembly manual.

Developed and tested with:

• Printer: Creality K1C

• Materials: PLA / PLA+

• Nozzle: 0.4 mm

• Layer height: 0.16 mm

🧠 Skill Level

⚠ This is an advanced mechanical model. Basic experience with 3D printing and mechanical assembly is recommended. This model is intended as an educational and demonstration piece, not a toy.

💬 Feedback & Updates

This project is actively developed.

If you encounter any issues or have ideas for improvement, feedback is always welcome — it helps refine future updates and models.

If you enjoy mechanical engine models and functional kinematics, feel free to check out my other engine projects.