V8 Engine Model | Functional Pistons, Valves & Timing Chain

🔩 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

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.