Atlas cam
- Thread starter pierodn
- Start date
T2219 was just the number on the cam blank for dommie twins - for quite a long way back (late 1940s).
It doesn't seem to identify the cams in any way - other than that they are definitely Norton.
I'll leave the X1 for someone else, but have seen this mentioned as something to do with the hardening process
(as was X2 ?).
But this identifies them as Atlas era (?).
In theory, you can just measure the height of the 'bump' on the cam, and figure out which grind this makes it... (??).
It doesn't seem to identify the cams in any way - other than that they are definitely Norton.
I'll leave the X1 for someone else, but have seen this mentioned as something to do with the hardening process
(as was X2 ?).
But this identifies them as Atlas era (?).
In theory, you can just measure the height of the 'bump' on the cam, and figure out which grind this makes it... (??).
X1 relates to hardness depth, X2 has twice the hardness, while you can consider anything without those markings to X1. (If memory serves me).
Don't what the actual depth of hardness is............no clue. The fact that the one cam is marked would indicate a more recent manufacture. (again, I think so).
Mike B.
Don't what the actual depth of hardness is............no clue. The fact that the one cam is marked would indicate a more recent manufacture. (again, I think so).
Mike B.
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pierodn said:
Piero:
The base circle must be subtracted from your measurement to determine lift. Lift should be about 8.5 mm for Atlas cam.
Slick
The std Commando cam is reportedly the same grind as an Atlas cam, so that would make sense...
Sounds like all 3 of your cams are the same, and Atlas then.
Do the cam lobes look like all the same shape.
This can be tough to just eyeball, some seeming slight differences can mean quite a difference...
Sounds like all 3 of your cams are the same, and Atlas then.
Do the cam lobes look like all the same shape.
This can be tough to just eyeball, some seeming slight differences can mean quite a difference...
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- Jan 2, 2013
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Rohan said:
Agree!
Only doing a degree wheel and dial indicator test can determine any differences.
Slick
