| Year | 2025 |
| Date | 24-Jan |
| Volume | 234 |
| Issue | 4,761 |
| Page | 223 |
| Category | Stationary Engine |
| Part | |
| Title | Stuart Turner Sirius Piston Valve. A Tale of Two Twins |
| Author | Graeme Quayle |
| Notes | Improves the valve timing of the Sirius engine. The original Sirius drawing, the original piston valve, the blue Sirius engine, the green Sirius engine, the original piston valve, the new piston valve, the revised piston valve |