Spreadsheet For Calculating Bob Weights



Spreadsheet For Calculating Bob Weights

Postby Indycars » September 5th, 2010, 11:54 am

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.

Use this link for information on how to install Office Compatibility Pack:
http://support.microsoft.com/kb/923505

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:

BobWeightCalculations.xlsx


BobWeightCalculations01.jpg

BobWeightCalculations02.jpg
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Last edited by Indycars on November 1st, 2010, 10:10 am, edited 1 time in total.
Rick
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Re: Spreadsheet For Calculating Bob Weights

Postby grumpyvette » September 5th, 2010, 11:58 am

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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