Crankshaft Counterweights

[d.j. moordigian]

Tom,...another photo,..ya I know it's a V/8 and it is extreme! But it is nice to view.

[Synchro909]

Originally Posted by d.j. moordigian

The best photo I could find, at that moment. Ya,..I don't like the
"counter weights" myself....I think there just wrong.

What I wanted too show is the hollow crank pins, especially the rod
throws. If you lighten the rod throw side,..it's the same as adding
weight too the counter weight,..without adding weight to the crank.

A lighter crank accelerates and decelerates quicker than a heavy one,..
that has to be "somebody's" law of physics ? I think that equals horsepower and drive-ability.

Question;...how much weight do you have to add too counteract
and kill the vibration? If a stock crank weighs (guess) 40 pounds and
you add another 20 pounds does that do it? how about another 20
pounds,...that makes the crank 80 pounds!
I could be wrong, and it wouldn't be the first time,... but adding all that
weight just dampens the cylinder firing..and that's all.

Your a train guy,...look at those 80" drivers and the counter weights.

Yes,...I still thinkthe crank needs counter weights....so change the
crank design instead of adding weight. Better steel (stiffer crank),
hollow rod throws...

Yes, ....I also know about balance shafts and odd fire and even fire
cranks.

Tom, I'm tired of typing..

Dudley

I agree the weights do look a bit skimpy but the hollow journals mean that less weight is needed anyway.

[1929]

Is it safer to get a new scat crank then have the old 85 year old one welded?

[CarlG]

Originally Posted by 1929

Is it safer to get a new scat crank then have the old 85 year old one welded?

It's about a thousand dollars safer on your wallet.

[1929]

Originally Posted by CarlG

It's about a thousand dollars safer on your wallet.

ya I know Carl, but its also $500 to weld

[CarlG]

Sponsored Links (Register now to hide all advertisements)

SCAT crank @ Snyder's = $1,585
Freight (aprox) . . . . . . . . . . 100

Weights from Bert's . . . . . . . $32
Weld & Balance locally. . . . . $395

Difference = $1,258

In addition, I would have to either had the crank sized to my bearings, or the bearings sized to the crank. Did not get a cost on that.