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Pitbox 24

ZN Discoveries

It was common practice in the late 40s for commercial tethered cars to have axles, wheels and nuts that were handed, ie. left hand threads on one side, right hand on the other. This was so that wheels were self tightening when under power and many a wheel has been ruined when brute force has been used to remove it, rather than turn it the opposite way. Paul Zere's patented semi pneumatic wheels extended this concept to the locking rings that held the two halves of the wheel together. Most will be aware of this information stamped into these rings. Last September though, amongst a large box of ZN related material discovered in a model shop, many years ago were the original ZN press tools that were used to stamp them. One imagines that a flypress was utilised in making these and note the holes for register pins so that the embossing is equally spaced either side of the indentations for the wheel key.   Thanks to Jim Hampton for this item. February 2024



The origin of these two engines remained a  mystery for many years, as the owner scoured books, magazines and touted them round swapmeets, hoping that someone could put a name to them. That was until one of those coincidences that continue to baffle and amaze us. Having shown it to a stall holder at a swapmeet with no success, a fellow member of the public leaned over and said 'I know what that is', 'it's an EMCO, and not only that I have the drawings for that and a smaller engine from the same company'. This single piece of information made sense of the name, as it is the acronym for the Model and Experimental Company, better known to us as E&M of Coventry. Some of their adverts mention model engines, but no photos have ever been found, either of this engine or the smaller 2.2cc model. What makes the 6cc version so unusual is the mounting holes that go transversely through the crankcase, possibly unique in model engine design. The smaller motor had one single bolt into the rear of the crankcase. So far, no one we have spoken to or any of the resources we have can shed any light on this obscure and rare British engine, especially as it emanated from a relatively well established company?

Information on this and the smaller motor is almost non existent, so if anyone can provide anything further such as an ad then we would be most grateful.
                                                                          Thanks to Jim Hampton for this item. January 2024