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Date: Thu, 17 Feb 2005 13:27:53 -0500
From: "The Malt Hound" <mypcnospam.com> wrote in message 
news:noudnQLWIPLFS4nfRVnyvgnospamhtview.com...
>
> "Dave Hinz" <DaveHinznospamcop.net> wrote in message
> news:37i3kqF5f0fraU1nospamvidual.net...
>> On Wed, 16 Feb 2005 23:15:00 +0000, Colin Stamp
> <col.dustbinnospamp.plus.com> wrote:
>> > On 16 Feb 2005 20:27:05 GMT, Dave Hinz <DaveHinznospamcop.net> 
>> > wrote:
> IIRC a piston engine cannot have its secondary forces balanced 
> unless it has
> at least 6 cylinders. Saab attempt to reduce the problem on their 4 
> cylinder
> engines with balance shafts which are not needed on a 6 cylinder or 
> more
> motor. I think we would all agree that a good 6 cylinder will always 
> be
> smoother than a good 4 cylinder, all other things being equal.
> Please don't ask for a proper explanation of secondary forces as I 
> put my
> books on the subject away some 50 plus years ago!

I think that the problem with a V6 is really that it is 2 conjoined I3 
engines. Because the vibration forces are applied at different angles 
they cannot cancel out.

-Fred W 

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