One more time. The BS's counter a second order shaking force which is caused by the piston pin offset in ALL I4 engines. In a large I4 like the 2.6 the problem is severe. The offset pin causes the pistons to move at different speeds on the up and down stroke, causing the engine to rock back and forth. Balancing the engine will do nothing to eliminate this force. I broke a handfull of ps pump brackets, and the alloy a/c bracket broke into a dozen pieces, and the alt bracket broke several times. I also broke about 4 motor mounts. You could not see if the car following you was a cop or a semi at cruise because all the rv mirrors vibrated so much it was all a blur.
The power drain is negligible. I would never build a 2.6 without the shafts. Porsche thought so much of the bs tech that they licensed the use from mitsu for the 924/944.
I've removed the BS' on 2 Porsches, both of which saw high RPM track use and abuse. There were no ill effects. Probably minimal gains, but hard to say since several things were done at a time. Though, some of it must have worked, seeing as how one of them was an 8V N/A that would keep up with a Turbo in a straight line. lol. <img src="/forums/images/graemlins/smile.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />
All in all, 6 lbs is a substantial amount of rotating mass to some. For a daily driver, not so much. But for a track car, that's substantial, and people pay good money to remove that from other parts of the reciprocating assembly.
