You will need Microsoft Excel 2007 or you can download "Open Office" for FREE here http://www.openoffice.org/.

Open Office can open and work with Excel spreadsheets. If you have an earlier version of Excel, then you can install the Microsoft Office Compatibility Pack, it's also FREE from Microsoft.

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It will be hard to obtain the typical weights for each end of the rod. I didn't see any manufactures that are publishing

these numbers, but with some research I did find where someone had post numbers for the Scat rod that I will be using.

I did find where Eagle is publishing their "Target Bob Weight" for their crankshafts and I have included those for the

SBC and BBC on the "Rod & Crankshaft Weights" sheet.

The reason for doing these calculations is to see if your particular components can be balanced Internally without

using heavy metal, which is more expensive. As long as the calculated Bob Weight is less that the Target Bob Weight then

internal balancing should be possible. Comments or corrections???

Download the Excel file here: