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Atlas 650, 600,500 cast iron barrels –the truth!

Norton Models (not Commando or P11)

Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby L.A.B. » Sat Apr 29, 2017 6:36 am

Also, what would be the point, as sleeving new barrels would only seem to add unnecessary machining operations and expense?
If some barrels were sleeved from new, and that is if, then the only logical reason to do so I can think of, would be to save a barrel casting where the boring hadn't been done correctly or had exposed a flaw in the casting, but would they have gone to the trouble of sleeving a reject instead of throwing it in the scrap bin?
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Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby Rohan » Sat Apr 29, 2017 3:02 pm

L.A.B. wrote:Also, what would be the point, as sleeving new barrels would only seem to add unnecessary machining operations and expense?


Indeed.
And why would they sleeve BOTH cylinders in a reject ??
The whole idea of cast iron cylinders was cheap cheap cheap to produce.
Cast it, machine it, plonk it on an engine.

If one sleeve moved in service Bernhard, then the sleeving wasn't even done correctly.
Since the sleeve gets hotter in action than the surrounding cylinder, it is VERY firmly locked in place,
since sleeves can only expand outwards with heat. As long as the interference fit is done correctly...

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Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby Bernhard » Tue May 02, 2017 3:07 am

Rohan wrote:Indeed.
And why would they sleeve BOTH cylinders in a reject ??
If one sleeve moved in service Bernhard, then the sleeving wasn't even done correctly.
Since the sleeve gets hotter in action than the surrounding cylinder, it is VERY firmly locked in place,
since sleeves can only expand outwards with heat. As long as the interference fit is done correctly...


I explained in a previous thread why one liner dropped down in the barrel -nothing to do with anything Norton or otherwise did.

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Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby Brooking 850 » Mon Aug 14, 2017 7:00 pm

If I was to race this new found 650 SS I have in the 500 class, what would be the best way to go about it?
I will leave as is to race in the open class until my 850 is back together.
Restroke in a set of 500 barrels or what?
Regards Mike
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Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby Bernhard » Thu Aug 17, 2017 5:01 am

Brooking 850 wrote:If I was to race this new found 650 SS I have in the 500 class, what would be the best way to go about it?
I will leave as is to race in the open class until my 850 is back together.
Restroke in a set of 500 barrels or what?
Regards Mike


Don’t quite see why this is on here, but a 650 will hardly qualify for the 500 class if 500cc is the upper class limit :!:

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Re: Atlas 650, 600,500 cast iron barrels –the truth!

Postby Brooking 850 » Fri Aug 18, 2017 12:31 pm

Bernhard, sorry wasnt quite clear enough.
Use the 650 bottom end , mount a 500 barrel and head or sleeve the existing barrel and use as a long stroke 500.
My aim is use the best of all this bike to get it to comply engine capacity wise to race in the 500 class.
I already have an 850 for the Open (501 cc + ) class.
Regards Mike
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