flywheel balancing
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
flywheel balancing
Hi
Awhile ago, I asked if it is required to balance a flywheel after resurfacing. Some thought yes, most sayed no.
Well, my 68 427 internally balanced engine flywheel was a original 6.500 RPM engine unit and was not bad, only got a slight resurfacing done due to new clutch being installed as I am installing the T56.
I asked to get it balanced and well, they had to drill 3 holes, so it was well out !!
The pic shows the 3 holes on the very outside diameter.
You figure now if balancing is required.
Günther
Awhile ago, I asked if it is required to balance a flywheel after resurfacing. Some thought yes, most sayed no.
Well, my 68 427 internally balanced engine flywheel was a original 6.500 RPM engine unit and was not bad, only got a slight resurfacing done due to new clutch being installed as I am installing the T56.
I asked to get it balanced and well, they had to drill 3 holes, so it was well out !!
The pic shows the 3 holes on the very outside diameter.
You figure now if balancing is required.
Günther
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by ZD75blue
How do you balance one anyway?
take it to machine shop and they spin it....same concept like balancing a tire
Drifting
Joined: Mar 2003
Posts: 1,608
Likes: 3
From: Canberra AUSTRALIA
St. Jude Donor '05-'06
Originally Posted by Surfer69
Why would the stock one be out of balance if the ring gear is new like yours looks? Slight surfacing is still symetric.
The front edge that touches the clutch is now flat after machining but the rear side may be warped (as the clucth side was before machining) hence differnent thickness around the flywheel will cause imbalance.
Think of it in terms of a one sided brake rotor. You only machine one side flat on a flywheel so the other side must still be warped.
Does that make sense?
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Originally Posted by Surfer69
Why would the stock one be out of balance if the ring gear is new like yours looks? Slight surfacing is still symetric.
I also noted that the holes are almost spread out 180 degrees, not quite but one hole offsets the others being drilled too big or deep.
If you overdrill one spot you need to move to another spot to rebalance what the first hole unbalanced.
You don't need to spin the wheel to balance. Static balancing can also work for a neutral balanced flywheel.
I have a fixture in the shop that will show even a thumb tac out of balance on a neutral wheel.
For offset flywheels I have a fixture that clamps on the wheel to simulate the offset balance
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
hI
THE REASON FOR THE ONE HOLE BEING SO FAR OFFSET IS BECAUSE THE OTHER DEEPER HOLES WOULD HAVE INTERFERED WITH THE THREDADED HOLES FOR CLUTCH ATTACHMENT. SO TO STAY AWAY FROM THOSE, THEY HAD TO COUNTERBALANCE WITH A SMALLER HOLE OFFSET. IS THIS UNDERSTANDABLE ?
GUNTHER
THE REASON FOR THE ONE HOLE BEING SO FAR OFFSET IS BECAUSE THE OTHER DEEPER HOLES WOULD HAVE INTERFERED WITH THE THREDADED HOLES FOR CLUTCH ATTACHMENT. SO TO STAY AWAY FROM THOSE, THEY HAD TO COUNTERBALANCE WITH A SMALLER HOLE OFFSET. IS THIS UNDERSTANDABLE ?
GUNTHER
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