| 21. | Undesired abrasion may result from the presence of carbon in internal combustion engines.
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| 22. | As Ray says, " The internal combustion engine is so 20th century ."
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| 23. | The first widely used internal combustion engine was the Otto type of 1876.
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| 24. | A particular icing vulnerability associated with reciprocating internal combustion engines is the carburetor.
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| 25. | It's just that they are not cost-effective when compared to internal combustion engines.
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| 26. | Splash lubrication was also used on the first internal combustion engines.
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| 27. | But the internal combustion engine is a known and proven technology.
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| 28. | By 1850, the internal combustion engine existed that is still in use today.
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| 29. | Rotary mowers with internal combustion engines come in three price ranges.
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| 30. | The internal combustion engines were available in various rated power outputs.
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