Posted by Janicholson on November 14, 2012 at 19:28:33 from (96.24.99.126):
In Reply to: 4 cyl Firing order posted by David G on November 14, 2012 at 19:02:47:
There are differences in harmonics in the crank that do make a difference. 1342 is more evenly spread on the crank length. The vibration at the whole engine level might be the same, but internally 1342 has the advantage. (and that is why it has the preponderance of use) a flat frank, (as these are) is somewhat less problematic than compound plane cranks, or especially offset journal cranks like on a V6 with 90 degree bores. Complex dampeners and external balance are often needed to assure crank durability. Main bearings between each rod journal (or twinned journals on a V engine) are not found on many of our old iron. that fact is even more of a factor when they are hot rodded. Jim
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