Transmission differences
- Thread starter bwolfie
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I went around the world and back trying to source a decent Cdo AMC shell for under $500 to be told by more than one major vendor around the world that the Atlas shell was the same thing except for the stupid thick washer spacer piece of fight idea, so then I went around the world again with better guestions on what happened to the piles of Cdo shells and cheapest Atlas shell around for $250 in USA which served Ms Peel well in her prime kick ass run out from under power state.
If that was a misstake I sure couldn't tell and boy howdy did I try to point of breaking teeth off cogs but a new set of teeth and off we went again. Vendors told me the Cdo notch was suppose to make shell easier to shift in cradle to remove. BS I much perfer the slick non floppy motion of an Atlas shell I'll never go back to Cdo type, ugh if ever need to again w/o Peel power handling to tempt me so easy to pull the trigger and hang on WOT shifts no clutch needed. Don't treat em like I did on Peel, as if that mattered to them wearing out just about as soon anyway - witness this subject thread.
If that was a misstake I sure couldn't tell and boy howdy did I try to point of breaking teeth off cogs but a new set of teeth and off we went again. Vendors told me the Cdo notch was suppose to make shell easier to shift in cradle to remove. BS I much perfer the slick non floppy motion of an Atlas shell I'll never go back to Cdo type, ugh if ever need to again w/o Peel power handling to tempt me so easy to pull the trigger and hang on WOT shifts no clutch needed. Don't treat em like I did on Peel, as if that mattered to them wearing out just about as soon anyway - witness this subject thread.
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The commando mainshaft is about a quarter of an inch longer than the one from a dominator/atlas . When I went to install my 6 speed box, the clutch was the quarter inch out of line, so I made a splined adaptor to fit Jawa speedway engine sprockets onto the Norton taper. The sprocket can float sideways, and they are cheap. I use single row chain for racing with a manx clutch.
N
nortonspeed
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comnoz said:
You only need the Commando main shaft, the Atlas shell is usable in every (AMC) Dominator and Commando (even the MK3 if you don't care for the neutral switch) but using a Dominator shell is not recommended as the Commando shell is more beefy especially around the bearings.
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The number of times it was said that the tooth form 7 materials were updated 9 every second uear 0 now means theyre built of ten times stronger material
with a ten times better tooth form than originally by the mk III . But the layshafts still the same . :lol: might pay not to mix cogs / per gear , if avoidable .
with a ten times better tooth form than originally by the mk III . But the layshafts still the same . :lol: might pay not to mix cogs / per gear , if avoidable .
I've been lucky then. I have a 1957 shell in mine which as far as I know has no cracks between bearing housings. Also have a '58 spare since the rumour is that the early cases were cast from a different spec but stronger aluminum? Might be just that, a rumour. The full length top mount (no 1/8" spacer) is the only external difference but doesn't cause assy/alignment issues. I guess the Atlas is the same in this respect.
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Most of the aluminium used in old British bikes was high in silicon to get the casting flow characteristics. Triumph pistons were probably RR55 Hiduminium, as used in Rolls Royce Merlin engines. We don't make that alloy in australia, if you need it, you import it. If the British used a stronger alloy in their cases, I cannot think what it might be. You could try applying a small drop of 10% caustic soda solution to the castings. If the drop goes black, the aluminium casting has copper in it. If it goes white - magnesium. Remember to wash the chemical off afterwards ! There are not many types of casting aluminium. Have look through the old UK Ministry of Technology specifications if you want t o find out what was used in their motorcycles.
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