Crankshaft Counterbalance Weight

[daren007]

Is it possible to “turn” a crankshaft as opposed to grinding.

[Pete]

Originally Posted by daren007

Is it possible to “turn” a crankshaft as opposed to grinding.

Yes. It is possible to "turn" a crank in a lathe by offset mounting it on 2 face plates. We made a single plane crank for a cut in half Chev V8 this way once.

[Synchro909]

From what I have heard, what ever you do to put counterweights on an A crank, you won't have the optimum. Right now, I don't remember the name of the guy who attaches shrink on weights to the crank, then puts more weight on the side of those. I think that setup would be heavier than the others and closer to ideal.
Clearly, shrink on weights will weigh more than the weld on ones because they go all the way around the crank flange without adding any more counterweight effect. I don't think we have enough information to properly answer this question.

[Pete]

Originally Posted by Synchro909

From what I have heard, what ever you do to put counterweights on an A crank, you won't have the optimum. Right now, I don't remember the name of the guy who attaches shrink on weights to the crank, then puts more weight on the side of those. I think that setup would be heavier than the others and closer to ideal.
Clearly, shrink on weights will weigh more than the weld on ones because they go all the way around the crank flange without adding any more counterweight effect. I don't think we have enough information to properly answer this question.

Using steel weights, about the maximum you can cram into the space available is 65%. By lightening the reciprocating assembly to a minimum safe value and using tungsten or depleted uranium for weights you could probably get very close to optimum. HOWEVER, I can tell you from first hand experience, an engine built this way is a horrible slug on a circle track.
It would do well in parades.

[Synchro909]

Originally Posted by Pete

Using steel weights, about the maximum you can cram into the space available is 65%. By lightening the reciprocating assembly to a minimum safe value and using tungsten or depleted uranium for weights you could probably get very close to optimum. HOWEVER, I can tell you from first hand experience, an engine built this way is a horrible slug on a circle track.
It would do well in parades.

Who wouldn't lighten the flywheel to compensate for the extra weight on the crank?

[Pete]

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Originally Posted by Synchro909

Who wouldn't lighten the flywheel to compensate for the extra weight on the crank?

Assuming you have used enough depleted uranium to balance the CRANK ASSEMBLY completely, the flywheel/clutch and damper weight has nothing to do with crank balance.

A heavy total weight, crank assembly limits the performance of any car not only by total weight added to the car but MOSTLY because of poor spool up.
This is usualy of little concern in a vintage street machine though.