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Dan MSun Jan-23-11 02:32 PM
Member since Dec 12th 2010
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"Norton Atlas"


          

Hello. New guy here. I'm glad I found this forum.

I'm putting together an Atlas engine. The bike is a 1964. Engine was seized. The original barrels were already at +.060" and in poor shape. I have 1964 barrels in good shape at .020" They have the same number stamped at the base as the original (24237) but they are flat across the deck and the original have a raised ridge around the cylinders. Also the crankcases were damaged and poorly repaired. I found a matched set from 1966. Now that I have these cases coming I find that the gasket sets are different from 64 to 66.
The original head is in good shape as is the crankshaft and camshaft. Can I use '66 cases with the '64 barrels and internals? One listing showed the earlier barrels as "spigot". What is the difference?
Thanks in advance for any information.

Dan

Dan

  

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NortonGuyThu Dec-23-10 09:09 PM
Member since Mar 18th 2009
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#1. "Deleted message"
In response to Reply # 0


  

          

No message

NortonGuy
Board Founder

  

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dynodaveThu Jan-13-11 06:35 AM
Member since Mar 18th 2009
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#2. "RE: Norton Atlas"
In response to Reply # 0


  

          

Yes they are slightly different versions.
SPIGOT is the raised ring on the barrel...which requires the coresponding counter bore in the head.

The later versions had a flat barrel and flat head with a smaller diameter squish band.

The early head had a factory update to put a "ring" in and therefore make like the late heads. Not an at home job. It requires machine shop intallation and machining.

The solutions all require work or money/machining.
The cleanest is bite the bullet and go with all 66 components.
The 63 internals will all carry over to the 66.

But note the oil pump drive gears must stay as a set 3 start or 6 start.
Study more before you "do".....this will help some http://atlanticgreen.com/nhth.htm

  

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Dan MSun Jan-16-11 08:09 PM
Member since Dec 12th 2010
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#3. "RE: Norton Atlas"
In response to Reply # 2
Sun Jan-16-11 08:24 PM by Dan M

          

Thanks Dave, good info. The link is especially helpful.
So my choice is have the rings installed in my head if i can find them. Is there a factory part number? (machine work is not an issue, I'm in the field) or find a later head which sounds more expensive.
I don't know which approach is more doable.

Dan

  

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dynodaveTue Jan-18-11 11:26 AM
Member since Mar 18th 2009
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#4. "RE: Norton Atlas"
In response to Reply # 3


  

          

id you see this on my web page?


"The same head with the 25494 steel conversion ring installed. This allows the use of this head on unspigotted flat topped barrels."

I have never looked for a pair of the rings. You would have to call around or reverse engineer/make a set... and heat/shrink fit them in and finish machine them to the deck.

  

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Dan MTue Jan-18-11 01:02 PM
Member since Dec 12th 2010
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#5. "RE: Norton Atlas"
In response to Reply # 4


          

Thanks Dave.

Yes I did see that. Probably unlikely I'll find a ring kit or other fix for this head. Too bad, otherwise the head is perfect. I'll likely look around for a head with the smaller combustion chambers.

What puzzles me is the two cylinders I have (one spigot and one not) have the same casting number. Someone probably had the deck cut on the one without spigots. Oh well...

Dan

  

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dynodaveWed Jan-19-11 12:32 PM
Member since Mar 18th 2009
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#6. "RE: Norton Atlas"
In response to Reply # 5
Wed Jan-19-11 12:33 PM by dynodave

  

          

Probably it is the factory that cut the barrels flat.
The factory used the same casting for both.
When the factory started cutting the deck flat, they just assigned it a new PN, which is not the same as the raw casting blank.

  

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Dan MTue Jan-25-11 04:11 PM
Member since Dec 12th 2010
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#7. "RE: Norton Atlas"
In response to Reply # 6


          

Just a follow up. - If any one else runs into this.

The rings are readily available. Part number 25494. I found them at Fair Spares. Walridge also lists them.

Thanks again for the help Dave

Dan

  

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shengxuanSun Feb-20-11 02:59 AM
Member since Feb 20th 2011
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#8. "RE: Norton Atlas"
In response to Reply # 0


          

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