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Ballance shafts...
Posted by Talladega900 [Email] (more from Talladega900) on Sun, 15 Sep 2002 16:14:50

In Reply to: Baby, you're much too ... smooth ..., J, Sun, 15 Sep 2002 14:51:03
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Some years ago, Saab added a pair of balance shafts: counterweighted shafts spinning at twice the speed of the crankshaft. This counters both primary vibrations (those found from the power and compression strokes) and, to a lesser degree, secondary vibrations (those found at ninty degrees to the compression and power strokes from the crankshaft's counter weights themselves).

If you do in fact rev the engine, you will feel some vibration. Myself, I'm not so sure if it's NVH (noise, vibration, harshness) that I'm feeling, or just the exhaust pulse.

It is, indeed, a very smooth engine for a 4 cyl, especially for one as large as 2.3 liters.

Jim Miller V.P. WASSAAB, The Washington D.C. Area Saab Club

'88 SPG, Tweaked APC and solenoid valve, Viggen BPV, FoMoCo 30# injectors, Trent/FSE-Malpassi RRFPR

'97 900 Talladega, Saab Sport Exhaust, Forge BPV, Abbott Motorsports ECU and wastegate actuator, Abbott lowering springs, Abbott Viggen Rescue Kit, SAS rear swaybar, Viggen Intercooler, Zimmerman crossdrilled rotors, AutoMeter boost/vac gauge.

'02 Aero SportWagon, no mods.

posted by 152.163.1...

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