Re: cross check epc picture saab vs GM engine. - Saab General Bulletin Board - Saabnet.com
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Re: cross check epc picture saab vs GM engine.
Posted by Dean (more from Dean) on Tue, 29 Oct 2013 08:43:33
In Reply to: cross check epc picture saab vs GM engine., pete [Profile/Gallery]
, Mon, 28 Oct 2013 20:08:01
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There is probably some DNA traceable to the GM Quad 4 engine.
The Quad 4 was quite a leap. It had direct ignition, eliminating the distributor, points, cables etc. Also ended up with balance shafts, which were not an GM innovation.
"""Mitsubishi Motors pioneered the design in the modern era with its "Silent Shaft" Astron engines in 1975, with balance shafts located low on the side of the engine block and driven by chains from the oil pump, and they subsequently licensed the patent to Fiat, Saab and Porsche.[1]
Saab has further refined the balance shaft principle to overcome second harmonic sideways vibrations (due to the same basic asymmetry in engine design, but much smaller in magnitude) by locating the balance shafts with lateral symmetry, but at different heights above the crankshaft. This introduces a torque that counteracts the sideways vibrations at double engine RPM, resulting in the exceptionally smooth B234 engine.
Toyota also began to use balance shafts in their 3RZ-FE engines in the mid 90s. These engines started as a 2RZ-FE, but creating greater torque and horsepower required a longer stroke. That longer stroke required balance shafts to counter balance the added vibration. The longer stroke transformed the displacement in the 2RZ-FE from 2.4L to the 2.7L for the 3RZ-FE."""
posted by 108.207.11...
http://en.wikipedia.org/wiki/GM_Quad_4_engine
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