Icon IC 743 piston weight incorrect

nm9stheham said

Hey Pishta... interesting info on the import rod work. However, for 4 cylinder inlines (or any inline), the reciprocating and rotating weight parts are not separated out; the whole piston-rod assemblies are weight matched against each other. So unless he is working on imports like V6 Z engines, etc. his technique does nothing of benefit (that I am aware of).

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I asked him in a comment about it and he replied the same way, on a 180 crank in a 4 banger, they self balance if the piston packs are neutral (1+4=2+3). a 120 crank (straight 6) and a 90 crank (V8) do require a little more math. Ill put this out to anyone trying to do rods at home: nm9stheham and I found repeatablilty the hardest part in building rod jigs. both of us had failures and successes but I for one never found a rock solid platform (or maybe more so a digital scale) that would give me 3 for 3 +- .1 or even .2g resolution. I accepted .3 at that and moved on. We all know Mopar didnt go this far at the factory so meh.....made me feel better trying and its a heck of a lot closer than factory specs.