Early camshaft
- Thread starter pierodn
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The earlier cams where the tacho drive comes from timing cover do not have the multi start scrolled part that drives the later style tacho but instead just have a plan solid shoulder.
A phone call or email to one of the many vendors of camshafts may answer your question better as I am not sure about the threaded hole for later points assembly.
A phone call or email to one of the many vendors of camshafts may answer your question better as I am not sure about the threaded hole for later points assembly.
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cam 22792= 650SS, atlas(20M), early commando (20M3) all use the same cam and profile
see for yourself here:
http://atlanticgreen.com/camsurvey.htm
20M3S is the same profile but inboard tach drive 06-1084 cam
see for yourself here:
http://atlanticgreen.com/camsurvey.htm
20M3S is the same profile but inboard tach drive 06-1084 cam
T2219 is just the factory number on the raw cam blank,
it doesn't actually tell you what grind is has.
T2219 can go back to the first model dommie.
Unless it has an X or X1 stamped into it, it is a milder cam than a Commando would have ever had.
It would probably fit if you were otherwise camless.
Tell us how it goes !!
it doesn't actually tell you what grind is has.
T2219 can go back to the first model dommie.
Unless it has an X or X1 stamped into it, it is a milder cam than a Commando would have ever had.
It would probably fit if you were otherwise camless.
Tell us how it goes !!
I don't know.
I've never heard of anyone fitting an old cam to a Commando,
usually its a newer cam in an older bike.
I wouldn't.
You'd lose 1000 revs. And the cam followers may not be suitable.
And if it damages something, it could get very expensive - for something that doesn't cost that much to have the right one...
I've never heard of anyone fitting an old cam to a Commando,
usually its a newer cam in an older bike.
I wouldn't.
You'd lose 1000 revs. And the cam followers may not be suitable.
And if it damages something, it could get very expensive - for something that doesn't cost that much to have the right one...
Rohan said:
Re; I wouldn't.
You'd lose 1000 revs. And the cam followers may not be suitable.
And if it damages something, it could get very expensive - for something that doesn't cost that much to have the right one...[/quote]
Rohan is never wrong :!:
Re; “You'd lose 1000 revs. And the cam followers may not be suitable”
Don’t know where you get this from :!:
The very early Commandos in '68 were fitted with Atlas engines with cam drive on end of timing cover just like the 650SS e.t.c. until they put the cam drive take off from the crankcases and fitted points onto the timing cover.
The only way to find out what cam profile is to measure it on lift and degrees duration, then compare with Commando cams, and see if you can fit it into Commando crankcases (which will have different cam brushes on later models) otherwise, suck it and see :!:
It may have a stamped letter on the side of a lobe, but remember the "T2219" means nothing and is eronious (erroneo).pierodn said:
Even if it did have numbers, you cannot be sure with something that old. All you, or any of us, can do is speculate.
Being able to use this cam is dependant on it measurements. This includes how it fits in your cases and the actual specifications of the cam. I think you need to either send it out to get it specified or put degree wheel on it yourself and figure it out for sure.
It is a bad idea to just guess with something so serious and so deep in the motor and unwise to try and save money here, evren if it is just for resale.
You may end up setting it on the hearth for decoration.
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that vertical lobe there , with all the pitting , is scrap .
but maybe refinishing or hard chromeing ? ? :shock: dont know if anyones tried that on a cam .
Modern Metal spraying ( Plasma ) might sort it out .
Should be smooth as a sheet of glass .
but maybe refinishing or hard chromeing ? ? :shock: dont know if anyones tried that on a cam .
Modern Metal spraying ( Plasma ) might sort it out .
Should be smooth as a sheet of glass .
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With all that pitting on the lobe, it needs to be re welded and ground to a profile. I would buy a new cam and one that is fit for your year engine. It would be false economy to try and use this cam as is.
Thomas
CNN
Thomas
CNN
Rohan is never wrong :!:Bernhard said:
Re; “You'd lose 1000 revs. And the cam followers may not be suitable”
Don’t know where you get this from :!:
The very early Commandos in '68 were fitted with Atlas engines with rev counter drive on end of timing cover just like the 650SS e.t.c. until they put the drive take off from the crankcases and fitted points onto the timing cover.
The only way to find out what cam profile is to measure it on lift and degrees duration, then compare with Commando cams, and see if you can fit it into Commando crankcases (which will have different cam brushes on later models) otherwise, suck it and see :!:[/quote]
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Bernhard said:
You run into fit problems with the timing cover of the latter points housing and oil seal. The end on the cam timing side is quite different.
Cheers,
Thomas
CNN
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I don't think 'because I can' is ever a good reason for doing anything. In some makes of bike, some of the earlier models were produced as race replicas, so the cams were sometimes sportier than those in later bikes intended for commuters. I don't believe that was ever the case with Norton twins however I think the Triumph 650cc Thruxton Bonneville of the early 60s had both race cams fitted. A 650ss Norton was a better bike in my opinion than a Bonneville, however the later Commando cams were probably better in the Norton twin motor. The way to find out is to install the cam into the Commando motor then sit down with a degree disc and a dial micrometer and map out what the cam does to the valve lift, on graph paper. Then do a search on cam profiles on this forum and compare, - use a bit of judgement.
In Australia we did not see many Norton Manxman 650 s, however my friend had one and in comparison with any Bonneville, it was superb.
In Australia we did not see many Norton Manxman 650 s, however my friend had one and in comparison with any Bonneville, it was superb.
Dano said:
Don't know where this old thread came from,
but X1 (and X2 ?) was a stamp to indicate something about the cam hardness apparently.
Whether they went to some new hardening process, or some other new spec, this shows it.
Remember, all early dommie cams used a STEEL camshaft.
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