Hot plug Diesel engines

Posted: December 9, 2011 in DIY, Fun, Steam Punk, Survival, Thoughts

Some technology of yester-year that is not very well know is that of hot plug engines.

These engines use a system similar to long stroke diesel engines and but do not develop the pressure that normal diesel engines do and so require a “hot” plug to be heated to ignite the fuel ,
these engines were common in tractors in the 1890’s and so on, until diesel engines were more reliable.

Wiki info on hot plug / bulb engines

This technology is interesting to us because it requires less precise machining
These engines were slow running (300-400 RPM) and mostly with cast iron parts including pistons,
the engine uses a carburettor because the charge only ignites when the mixture is compressed into the bulb .
A big attraction with the hot-bulb engine was its ability to run on a wide range of fuels. Even poor-burning fuels could be used since a combination of vaporiser- and compression-ignition meant that such fuels could be made to combust. The usual fuel used was fuel oil, similar to modern-day diesel, but natural gas, kerosene, paraffin, crude oil, vegetable oil or creosote could also be used.

Compared with steam, petrol, and diesel engines, hot-bulb engines are simpler and therefore have fewer potential problems. There is no electrical system, as found on a petrol engine, and no external boiler and steam system as on a steam engine.

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