Ballancing a 1973 340

Ballancing a 1973 340

Hello again. :)

Been a busy few days and Ive been switching from 15 days of night-shift to day-shift without a break and Ive been a zombie. :D

As Im working on an Oil Rig away from home Im unable to get a picture of the FlyWheel and I dare not ask the Garage as they are moody buggers. I do have a picture but its of the Pallet of 4 Speed parts I had shipped over from Australia. Everything is cleaned up now though.

Thats a good idea regarding fining out about the Hemi 6 balance, Ill do that, thanks. :)

Paying for the Drilling is not a problem, but if I have to start ordering hundreds of dollars worth of parts then the shipping to the UK and the Tax and Import Duty involved thats not an option just now.

http://i1250.photobucket.com/albums/hh524/andy_harris4/_20_zpsdrxnvxjs.jpg

nm9stheham said
Maybe or maybe not. I can't tell you since I don't know the imbalance that has been put into your flywheel at present, and at what location. Your present imbalance can be takne out by drilling the same hole pattern at the opposite side of the flywheel. And then a new set of holes drilled. Whether it would end up like swiss cheese, I don't at this time know LOL.

And the hemi 6 imbalance could be already very close to the late 340, or could be such that it would make things a lot worse. But it could all be figured out by comparing the imbalance needed for the hemi6 versus the imbalance needed for the late 340's.

If it helps you to work this out, this is all actually straightforward to understand. Imagine you are spinning around (without getting dizzy) and you hold a fixed amount if weight at with your right arm half extended. That imbalance is called a moment and is specified by simply multiplying the weight by the distance from the center of rotation. The more the weight OR distance from center, the more the moment. The moment angle is where it is relative to a reference angle; in the case of you spinning around, the reference angle could be where you are facing. If you changed the weight from the right hand to the left hand, you changed the moment angle by 180 degrees.

The same applies here for your flywheel; a certain weight at a certain distance gives you the right moment. The angle relative to the 6 bolt pattern gives you the right moment angle. Or, you can place 'anti-weight' (drill a hole) at the opposite angle and achieve the same thing.

I would first be finding out the hemi 6 moment and angle and comparing it to the late 340 moment and angle. I can probably dig out the latter info, but I am not so sure on the hemi 6 info. Do you think you could find some info on the hemi 6, like how a neutral balance flywheel is imbalanced for the hemi 6? The info would look like this diagram about 1/3 down in this thread:
A question of balance..............(Mopar related)

If you can find the hemi 6 diagram, I'll find the late 340 diagram and try to find time to compare them.

And if you have photos of both side of your flywheel, that would be good to post.

Of course, if you can't do the drilling yourself, and have to pay, then this might not work with the present financial situation. But it sure would be the least cost way to get the flywheel that you have to what you need.