http://fordsix.com/forum/viewtopic.php?f=1&t=70822
The exact references were on two engines, Stans TRD 4AGE item, and David Vizards A series engines. They are conclusive enough, though more data would be nice...On this board, the Atlantic TRD Toyota 1600 cc twin cam 16 valve engines, when the rod ratio was altered, plotted to this above stricture at 9000rpm. So did David Vizards 1549 verses 1435 Mini A-series OHV engines at 5500 to 6500rpm. In the case of Vizards, specific dyno calculations determined frictional hp loss, and the rod ratio resulted in a frictional hp loss or gain, proportional to HALF the algebraic difference in L/R ratio.
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