Thread: Flat-4 Power!!!
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Old 10-02-2000, 10:53 PM   #12
Scooby Specialist
Member#: 438
Join Date: Oct 1999
Chapter/Region: W. Canada
Location: St. Albert, AB, Canada
2004 STi
White on Gold



Thank you for your post, but with all due respect, me thinks you misunderstood me. I was talking about balance shafts not counter balancing a crankshaft.

Everything you said about the crank is absolutely correct, however, as I understand it, straight 4's have secondary motions (side-to-side IIRC) that create the traditional buziness/harshness that has been typically associated with 4cyl engines.

Awhile back some engineers decided that if they put a "balance shaft" in the engine that is on an eccentric it will offset/reduce these secondary motions of the traditional inline 4cyl engine. IIRC these balance shafts turned twice for each single rotation of the crankshaft.

Hope this makes sense.

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