Quote:
Originally Posted by JonEQuest
I don't have a scale but I don't think weight is as critical as people think as long as you are using identical rods and pistons. I recently rebuilt my N54 in another car and swapped in a whole other used piston and rod I bought off eBay to replace my bent #3 rod. I have full bolt-on's and I run the car hard with no problems. I can see that being an issue if you swap in one different variation of an engine that may have a slightly different piston/rod weight. My issue right now is the big end size and diameter on the N55 I am rebuilding now.
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I posted in your other thread... I am sure it will run just fine, but, there is a science to it. manufacturing tolerances, especially on performance motors, are kept as small as possible. More weight variation = less lifespan at high rpm. More quickly failing DMFW and harmonic damper etc. Too much variation and the engine will tear itself apart. I'm sure you'll be fine with another stock rod. This isn't the 60's anymore. Max deviation might be 5g but from the factory things are probably balanced closer to 1g. Much less deviation in reality than the actual "max deviations" listed on TIS.
It's just important to understand all these things when slapping back together a blown up engine lol.