Motocykle zabytkowe, Vintage motorcycles, Oldtimer-Motorräder
Motocykle zabytkowe, Vintage motorcycles, Oldtimer-Motorräder
Dynamo Z is another model in the series of replacement alternators we have been producing for several years. Based on the experience gained from producing previous DYNAMO models, I decided to expand the offering with the DYNAMO Z for the Zündapp K800.
Many users of these wonderful machines have asked about the possibility of creating a replacement for the original alternator. In response to their needs, we have developed such a device using our proprietary voltage regulator design in either 6V or 12V options.
The regulator in this model is not built using thyristors or transistors that cut off excess current to the ground. It only draws energy from the dynamo when the electrical system is loaded by consumers (such as turning on the lights, charging the battery, or using the horn). This is a huge advancement in such devices, allowing users to ride with or without a load as needed. This also applies to riding with or without a battery.
The device is built to the exact size and external appearance of the original alternator. It is mounted in exactly the same way as the original alternator, following the wiring diagram of the Zündapp K800 motorcycle’s original electrical system.
One of the users noticed a difference in the way the motorcycle “starts.” He stated that with 12V, the motorcycle runs more efficiently, starts more easily, and is not prone to voltage drops. He was interested in the 12V dynamo version. An important factor for him was that 12V light bulbs are widely available at every gas station. The fact that they don’t fit the original sockets was not a problem for him, as he didn’t expect to get the original lamp insert, so it didn’t matter to him. 🙂
Another person argued that the motorcycle, which is now considered a gem of vintage automobiles, must be restored as close to the original as possible. Therefore, the 12V version was out of the question. He expected a 6V version. Additionally, he emphasized that in the 6V version, it is possible to use a small battery that imitates the batteries from that era, which gives the restored machine the proper appearance and character. Generally, 6V is the nominal voltage, and since the motorcycle is quite rare and expensive, many users want to keep it as original as possible. The 6V version allows this, preserving the original elements of the electrical system. This is the option for this group of Zündapp K800 owners.
In the 12V version, the light bulbs, battery, and ignition coil need to be replaced. There is also a question about the horn. In the case of the 6V horn, after adjusting the gap with the adjustment screw, it can be used in a 12V system. However, with prolonged use, meaning continuous honking, it may overheat or get damaged. This would require sustained honking, which is not really practiced. Who keeps the horn pressed continuously for 20 minutes?
| parameter | 12V version | 6V version |
|---|---|---|
| nominal voltage | 12V | 6V |
| maximum power | 100W | 70W |
| polarization | (-) to ground | (-) to ground |
| No-load voltage (engine 1000 rpm, dynamo 1300 rpm) | 14,4V | 7,2V |
| Loaded voltage (engine 1000 rpm, dynamo 1300 rpm) | 13,5V (80W) | 6,6V (60W) |
| Loaded voltage (engine 1400 rpm, dynamo 1800 rpm) | 14,4V (80W) | 7,2V (60W) |
