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Hit and miss engines.
| Frank Dolman | 21/09/2010 09:40:56 |
| 106 forum posts | Why, please, are Hit and miss engines so called? |
| John Olsen | 21/09/2010 10:22:45 |
| 1294 forum posts 108 photos 1 articles | Because the usual form of governor for these engines works by holding the exhaust valve open when the engine reaches the desired maximum speed. This causes the engine to stop firing, then as it slows down the exhaust valve is released again and the engine starts firing again. This gives a characteristic sort of chuff..chuff..chuff..clickey clickety chuff chuff chuff beat to the engine. When you put a load on, they fire more often and at maximum load will never quite reach the maximum speed so they don't miss any beats. regards John |
| Frank Dolman | 22/09/2010 01:55:36 |
| 106 forum posts | Thank you John. Very clear. |
| John Wood1 | 22/09/2010 12:20:05 |
 116 forum posts | Hi. When if fires it 'hits' and when the open exhaust valve prevents this it 'misses' Have a look on YouTube and you will find several videos. Fascinating engines to watch!
Cheers
John |
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All Forum Topics > Beginners questions > Hit and miss engines.