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Around 2000 AD someone realised that everything done so far was on the “Top Part” of the engine only

It had been noticed that if one could vary the stroke of the engine while it was running advantages could be achieved. A change to the Bottom Part!

  1. Variable Compression Ratio (VCR) – changes the performance of the engine with compression – the size of the engine changes as required.
  2. Homogeneous Charge Compression Ignition (HCCI) – meaning 

Homogeneous charge – all as one – the charge of fuel and air are properly mixed.

Compression Ignition – Ignites when compressed to a certain point (not to be mistaken for Diesel, which ignites because the fuel is injected in a compressed environment. Compression is greater than required for ignition)

The advantages of this ignition are that it is uniform throughout giving 25% efficiency improvement.

For the next 10 years or so till about 2010 AD motor manufacturers around the world had prototypes of variable stroke engines (Dynamically Variable Stroke Technology DVST) with some success, but none actually reached production volumes because of complications.

Governments encouraged this development.

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