| Year | 1931 |
| Date | 20-Aug |
| Volume | 65 |
| Issue | 1,580 |
| Page | 180 |
| Category | Petrol Engine Topics |
| Part | |
| Title | Some Problems in Model Two-stroke Engine Design |
| Author | Edgar T.Westbury |
| Notes | Two-stroke engines, "general purpose" port timing diagram, shape of ports, piston deflector, cylinder head to promote turbulence, "delay" valve in transfer port, offset cylinders, mechanically-operated valves |