V8 Engine Model | Functional Pistons, Valves & Timing Chain

This project is a fully functional V8 engine model designed for 3D printing. It features:

• Moving crankshaft, pistons, timing chain, and two valves per cylinder, standard firing order: 1-8-4-3-6-5-7-2,

• Fully printable timing chain,

• Can be rotated manually or powered by a popular DC motor,

🔩 Assembly Details

The model is assembled using:

• Crankshaft and camshafts: 6x bearings 608 (you can print it from included files),

• Oil pan: 8 × M4 × 25 mm + nuts,

• Cylinder heads: 8 × M4 × 25 mm + nuts,

• Timing chain tensioner: 1 × M4 × 25 mm + nut, 608 bearing

• Timing chain guides: 2 × M4 × 10 mm + nuts,

Optional DC motor mount:

• Motor type: standard TT DC gear motor (48:1, 3–6 V, yellow plastic housing – widely available)

• 2 × M2.5 × 25 mm + nuts, or M3 × 25 mm screws (without nuts)

🔩 Printing tips

• Camshafts: print vertically with supports (recommended) or print in two parts and press together

• Crankshaft: print vertically with supports

• Valves: print horizontally with supports (vertical printing likely to fail),

• Timing chain: print with 0.16 mm layer height. Suggested material PLA

Check out my other engine models!

Update 27.12.2025

• Updated assembly & adjustment instruction

• New version of valves spring. No support required

• New version of camshafts - Added pin to connect two parts toghether. No more glue issues
  Thanks to users who pointed out the problems.

Update 24.12.2025

• Uploaded assembly & adjustment instruction

• Improved DC motor adapter

Update 09.12.2025

• Improved cylinder header for better look.

• New valves spring, easier to print.

• Improved bearing dimentions.