Re: Need Advice... Real Bad-like

[farna@xxxxxxx]

Sorry for adding to the confusion Todd! You'll have to ask the machine shop about balancing. Most balance components individually. A simple explanation is the counterweights on the crank must equal the reciprocating mass (rods and pistons). Part of the balancing is making sure all the pistons and rods weigh the same. If the counterweights on the crank can't be drilled or have adequate weight added/removed then weight is added/removed from the flywheel (or flexplate) and/or balancer. The further out on the diameter of the flywheel/flexplate the weight is the more affect it has (acts like a heavier weight close to crank centerline). 

Now the factory did things in a different manner! They assembled the engine THEN balanced it. Well, first of all they determined balancing weights during design and made parts accordingly. Then they connected the assembled engine to a machine that turns the crank at a given rpm. This macine points out where additional weight needs to be added/removed (usually on the balancer as this is mainly fine tuning -- the weight on the flexplate is predetermined and the same on all factory engines). It works in the same manner as a spin tire balancer. A big engine rebuilding shop might have the same type balancer. For most stock engine rebuilds balance will be "close enough" without all the work, but will add to longevity. Of course high rpm engines really need balancing to survive long! 

You can get the late model flex plate "match balanced" to the early one. Just take both to the machine shop. They will spin the one up and determine where the weight should be and how much it weighs then spin the second up and see how close it is, adding or subtracting weight as necessary. Some remove the existing weight from the second flexplate and just add whatever is neccesary from checking the first one. 

Does that make sense? 

On April 20, 2005 Todd Wallis wrote:

> At first I just thought I was confused but now I am positive.
> 
> After examining the back of the 360 crank I have determined that, yes, it is
> indeed incompatible with my transmission torque converter in the 904.
> 
> My whole intention is to get a motor in the Javelin with the least amount of
> hassles while I am building another for it.    My Rebel Machine has a
> recently rebuilt motor (the 360) but needs a restoration.  The restoration
> on the Javelin is done except for the motor.  This was the logic for putting
> the motor from the Machine into the Javelin.
> 
> Dave,  the motor is out but when you recommend to have it balanced - is this
> something a machine shop can do without opening the motor?


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