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General Chat (Vincent Related)
Engine assemble part 2 Gofo
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<blockquote data-quote="vince998" data-source="post: 32239" data-attributes="member: 261"><p>Hi Bill,</p><p>Unfortunately i´ve forgotton what Rolfs balance factor is but i´ll find out the next time i see him. The Egli i restored (EV 6) was left as it was. the vibration was OK but compared to a well st up standard vin was still excessive.</p><p>What i´ve never been able to work out (and what nobody ever tells you) is: if a crank is dynamically balanced with a balance factor with say 8:1 pistons. How can that crank still be correctly balanced with 11:1 pistons (of the same weight) when running in the engine. Surely the increased compression, larger primary (and secondary) forces, faster piston acceleration and de-acceleration rates are going to bugger it all up. Its most probably possible to mathematically calculate whats needed, but i believe much more that the values are based on experience and finding someone thats got it right (planned or luck) and copying?</p></blockquote><p></p>
[QUOTE="vince998, post: 32239, member: 261"] Hi Bill, Unfortunately i´ve forgotton what Rolfs balance factor is but i´ll find out the next time i see him. The Egli i restored (EV 6) was left as it was. the vibration was OK but compared to a well st up standard vin was still excessive. What i´ve never been able to work out (and what nobody ever tells you) is: if a crank is dynamically balanced with a balance factor with say 8:1 pistons. How can that crank still be correctly balanced with 11:1 pistons (of the same weight) when running in the engine. Surely the increased compression, larger primary (and secondary) forces, faster piston acceleration and de-acceleration rates are going to bugger it all up. Its most probably possible to mathematically calculate whats needed, but i believe much more that the values are based on experience and finding someone thats got it right (planned or luck) and copying? [/QUOTE]
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Engine assemble part 2 Gofo
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