[juma]

In Herb Adams' book, 'Chassis Engineering' I saw a reference to rotational mass. He stated that items rotating at axle speed (i.e. the tires and wheels) were roughly three times harder to accelerate than non-rotating items. In other words, removing 80 lbs by going to slicks and convo-pros was equivalent to taking 240 lbs out of the trunk of the car.

I had no trouble believinng the above statement, since you can see that for yourself by doing the math. However, he also stated that rotational mass attached to the engine was15times harder to accelerate - in other words, if you could reduce the driveshaft weight 25 pounds you gain the same performance benefit as you would removing 400 pounds from the rest of the car.

seems like an aluminum driveshaft might be a big plus for running the quarter mile or messing with those pesky short cab dodges.

I have heard this particular place is a good product/good price but have never had such a driveshaft. any thoughts?? juma