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Article Seems To Be Misleading... (archive)

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Posted by dpeete on September 15, 2000 at 17:55:13:

In Reply to: Dinan Link to article posted below posted by Dan Wang on September 15, 2000 at 13:27:03:

You notice how he briefly mentions the lightweight flywheel with the following statment:
It is also important to note that while the large springs of a dual mass flywheel absorb some of the torsional impulses conveyed to the crankshaft, they are not harmonic dampers, and are only responsible for a small reduction in vibration.

What this leaves out is the fact that the lightweight flywheels sold by Dinan increase resonance as well. As a matter of fact, ERT's study showed that there was a larger increase in resonance from a lightweight flywheel then from a pulley which sounds reasonable since there is a much larger reduction in mass. So while Dinan is damning the pulley he is also damning his own lightweight flywheel.

The arguement about underdriving itself is a valid point, but cannot really be properly addressed without looking at numbers. The theory is sound, but Dinan is hardly quantitative. "Underdriving too much can ruin an engine" is a true statement, but so is "Drinking too much water can kill a person". Without any quantitative data these are both useless statements.

Anyone else have any thoughts on this?

Doug



http://www.dinanbmw.com/html/danger_of_power_pulleys.htm





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