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Re: new member - c4 trans swap

Subject: Re: new member - c4 trans swap
by vetteoz on 2009/7/10 11:13:36

Quote:

bogus wrote:
From my perspective, a internally balanced motor has to be better because the weight is right (distributed?) all away across the crank. The rods and pistons are the same weight and the crank counter weights get drilled or mass added to bring the mass into balance.

Exactly , but to my mind that counterweight is still behind the rear main bearing; on an old 2 pce crank it is a big weight close to the crank centerline as part of the crank flange.

[IMG]http://i171.photobucket.com/albums/u309/vetteoz/SA110_26.gif[/IMG]

In a 1 pce crank ,the weight is in the same location relative to the bearing ;
only a smaller one is used further from the crank centerline (weight on flexplate )

[IMG]http://i171.photobucket.com/albums/u309/vetteoz/SA110_2_3A.gif[/IMG]
[IMG]http://i171.photobucket.com/albums/u309/vetteoz/flexplate.gif[/IMG]

My 383 is factory 1 pce "ext" balance at rear but because of the lightweight internal components ,weight was removed from the flexplate weight

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