Quote:
Originally Posted by Killerfish2012
Do some research. This has been discussed to death. Main bearings mirror rod bearings, and also show advanced wear in supercharging applications, so change those as well. When supercharging a naturally aspirated engine, the key is how much boost you plan to run. Boost, in general will obviously negatively influence engine longevity. The unofficial number is 4.5lbs of boost. Don't run more than this without properly prepping the engine which will cost a lot of money.
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I have followed all the rod bearing threads and have not seen much to indicate trashed main bearings. I don't think main bearings are subjected to the same force as rod bearings since the rods move up and down and the crank stays in place. I think Gintani took apart a motor and Malek took apart a motor and found one or more bad main bearings. But those are the only two I am aware of and there are probably a couple of thousand supercharger kits running around on these motors. Many of those kits run more than 4.5 psi boost.
Building an engine is ideal, but very expensive. I would not do it unless it was necessary and I don't think it is necessary. I have changed the rod bearings on my motor and would not hesitate to add a supercharger kit next year when I will have about 75k miles, if I have the money for a used kit.