| Year | 1952 |
| Date | 10-Jan |
| Volume | 106 |
| Issue | 2,642 |
| Page | 53 |
| Category | Petrol Engine Topics |
| Part | |
| Title | New Engines for Old. How an Ancient Gas Engine was Improved, Modernised, and Given a New Lease of Life |
| Author | Edgar T.Westbury |
| Notes | Valve chamber, valve caps, compression ratio |