Performance crankshafts use Tungsten inserts to bring the mass closer to the rotating axis, reducing inertia. You can end up with some very funky looking crankshafts doing this, as they look like they have no counterweights. Tungsten weight added to a crank shaft counterweight.
Performance crank designed for tungsten weights ,img src="http://www.ret-monitor.com/articles/wp-content/uploads/2011/07/advanced-metals-tungsten-weighted-crankshaft.jpg"/a> High powered media (Race Engine Tech Monitor) has tons of info about exotic materials use. I wish I could afford the subscription. https://www.highpowermedia.com/ret-monitor/3146/tungsten
-Dan VTC Solenoid Caps and install instructions.
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