Posts Tagged ‘CG’

Moving the Battery to the Back

June 4th, 2009 No comments

A lot of folks move the battery to the back of the car to help out the weight balance. This was done in the early GT-350s, until some time in ’66, when people started complaining about fumes in the passenger compartment, and then they moved it back. I thought about it, but while reading Race Car Engineering and Mechanics by Paul van Valkenburgh, I found the formula for calculating the difference it would make.

The formula is:

((component move distance in inches)(component weight))/(vehicle weight) = (CG distance moved in inches)

This comes out to (144×20)/2500 or so (could be up to 3000 lbs). So I’d only be moving the center of gravity back about 1″. Not worth it! Not to me anyway. That’s the sort of thing that would be a great part of a bigger plan. If you’re moving a lot of stuff and lightening the car a lot, it would be a part of a larger difference. For me, my car is not the sort where I’m getting every last HP and every last bit of handling. I’m not stripping out the interior or putting on fiberglass panels (except for the hood). I doubt I’d notice it at all, though I don’t doubt it makes a difference for someone.