Ex Air ministry Alcon Pumps

[davidbliss]

These were bought sometime in the 1950s, ex air ministry. One was seized and was only used for spares. The other one also came crated with a multitude of spare parts, this was used for years and we never realised the differences between to the two pumps.

The one Jap engine has no governors and internally the valves only have the normal single guide, the cam shaft has large gear teeth. It also had screened ignition with what looked like and aircraft plug in. This was difficult to get but this was replaced with a normal plug lead and plug.
The other engine had governors and the valves were supported in two guides, which is unusual. The normal guide at the top and another below the spring. The cam shaft had fine gear teeth.

The one without governors revd upto 4000 which way above the 2400 that the manufacturers said. It also fast primed which is probably why.

With me being inquisitive as a young boy. I pulled the spare pump apart, but it then got pushed into an empty bath for 40 some years in bit. In the end for something to do I got it out, reassembled and it actually goes.

Does anyone know what the differences in years are and also why they had these differences.

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