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Old Oct 28, 2012, 05:14 PM
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United States, NY, St Lawrence
Joined Feb 2012
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The point of using a Harley Davidson engine as an example is that it, like the OS & Saito 4-strokes, has pushrods that are externally situated.

The pushrods do not get as hot as the cylinder & therefore, they do not expand as much. Therefore, valve lash will increase as the engine reaches operating temperature.


Regardless of the material that the cylinder is made of, it will get hotter than a pushrod that is segregated from the cylinder heat. The cylinder will therefore expand more than the external pushrod.
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