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Old 03-05-2010, 08:09 AM
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Default case boring?

case boring what all is done when you have that performed? i saw a piston kit that said must have case boring done? i need some schooling thanx in advance.
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Old 03-05-2010, 09:27 AM
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With your bike coming with a stock 96", anything over 107" would need case boring. They literally bore the area of your cases where the pistons come through to accomodate the larger diameter.
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Old 03-05-2010, 10:48 AM
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Quote:
Originally Posted by hyPerhog View Post
case boring what all is done when you have that performed? i saw a piston kit that said must have case boring done? i need some schooling thanx in advance.
We have been boring cases for over 20 years.
The cases are split, and set up in a vertical mill, on a 90* precision angle plate, machined just for that application, square with the quill, and indicated dead nuts on center.
If using an Axtell 4 1/8" cylinder, a 2 step boring process then is established, and the dimensions are held to their exact specs.
Once that is completed, the center hole is then machined thru to the lifter side, and their proprietary hardware is then used.
Usually what follows that, is also a Timken bearing conversion in the left case half, as long as the crank is running true.
Scott
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Last edited by Hillsidecycle.com; 03-05-2010 at 12:35 PM..
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Old 03-05-2010, 11:00 AM
splitting_lanes splitting_lanes is offline
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Quote:
Originally Posted by Hillsidecycle.com View Post
We have been boring cases for over 20 years.
The cases are split, and set up in a vertical mill, square with the quill, and indicated dead nuts on center.
If using an Axtell 4 1/8" cylinder, a 2 step boring process then is established, and the dimensions are held to their exact specs.
Once that is completed, the center hole is then machined thru to the lifter side, and their proprietary hardware is then used.
Usually what follows that, is also a Timken bearing conversion in the left case half, as long as the crank is running true.
Scott
and it don't cost that much to send your cases to New York either... :^)
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Old 03-05-2010, 07:04 PM
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thanx guys for the information.. i understand now.
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Old 03-05-2010, 07:25 PM
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Default Boring Job

Remove and disassemble engine.

Gut the block and reassemble the 2 halves.

Mount in milling machine, level, and center on the case bore.

Chuck up proper tooling, cut to desired diameter.

And as mentioned, a second step cut is done where necessary.

A twin cam A block goes like this.
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Old 03-05-2010, 07:36 PM
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Those cases look MIGHTY familiar.
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5225 S. MAIN ST., MUNNSVILLE, N.Y. 13409
315-495-6650
www.hillsidecycle.com
Palmer Bros. Performance Products
Complete Machine Shop
Case Boring, Cylinder boring
Complete Cylinder Head Shop
Super-Flow Flow Bench
Crank Rebuilding
Dyno Tuning
Our exclusive Predator Series Engines
From Flatheads, to 2014 models.
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Old 03-05-2010, 10:28 PM
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Quote:
Originally Posted by splitting_lanes View Post
and it don't cost that much to send your cases to New York either... :^)

That's where mine are headed come Monday morning.
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Old 03-06-2010, 07:11 AM
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couldnt you just shorten the piston skirts and save a lot of time?
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Old 03-06-2010, 07:39 AM
Kingofcubes Kingofcubes is offline
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No, you wouldn't have any skirts left. The factory has taken the o-ring out of the new cases around the locator dowells so we no longer step bore the cases.
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Old 03-06-2010, 07:39 AM
 
 
 
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1200, boring, cam, case, cases, cost, davidson, disassemble, fixture, harley, primary, requires, specs, split, splitting, ss, twin


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