T stamped on the cam
- Thread starter pierodn
- Start date
- Status
- Joined
- Jul 25, 2010
- Messages
- 5,789
It means at 3 1/2 thousand it will start to lift the front wheel , youll be near vertical at 4 , it wont come down again , and youll be stuck like that . :wink: :lol: 
:twisted:
:twisted: 
- Joined
- Jul 25, 2010
- Messages
- 5,789
And I was thnking it was ' turbo ' . :? :x :cry: . bother .
Quite Likely Indeed . pirated from service notes ;
" CAMSHAFTS: The later camshafts are tuftrided ña process which gives hardness without losing toughness. It can be
recognized by an even brownish grey color all over the shaft. Many dealers may still have earlier shafts on which the
cams are bright and these are not so good. so if you are after a cam, shop around. Avoid the SS cam like the plague--it
is nothing but trouble in a road bike and is slower than the ordinary cam (which was, after all, the grind used for those
650 production wins at Thruxton -- you remember, in the good old days when Notions won races), It is a good plan to
ease the end of the cam where the sprocket fits, so that this too can be pulled off easily -the next time. Never hammer
the cam nut tight without a cutaway timing cover or all your work getting the idler spindle tight will he undone. Even
pressure is sufficient and will cause no trouble.
A box spanner is preferable here, as the nut is shallow and slightly recessed ; a ring will tend to slip.
The "SS" cam mentioned here is the Commando SS cam or double S as used in the Combat engine (Interstate) as
opposed to the Commando standard cam which stemmed from the 650 SS profile mentioned. Referred to as the
"SS" because of its origin. This standard cam profile is as used on tire Atlas as well, and is now reverted to for
the 850s.
CAM BUSHES: If you are unlucky enough to have a pair of cases with steel cam bushes (they are bronze faced. but
can be recognized by the X-shaped oil grooves in the bronze surface of the bush), you must use bronze faced thrust
washers each side of the timing side crankcase. Break off the tabs which locate the washers in the hole alongside the
bush or they will break off in use. They are exactly the right size to drop into the crankcase and pass up the oil return to
the oil pump, "is seizes the pump, stops the oil supply, and within a very few yards the evidence disappears through the
bottom of the crankcases. There is no sump filter on the 1972 crankcases, and these are the ones with the steel hushes.
Very clever,
Further if; the steel cam bushes with "X"' oil grooves. or scrolling - these may be used with a plain or scrolled
camshaft. On no account fit a plain camshaft in plain bushes. Plain bushes were fitted to early engines and are
now being used again. "
THOUGH I consider a 2S cam , in a appropriate set up suitable , as it will pull from 1200 , or 2000 , or 3500 .
But when its past 4000 That is PULLING . So if theres no speedlimits and you dont live in Town , you may not
get arrestted with a 2S cam. anything applying to that I think would apply to a 4S also .
Quite Likely Indeed . pirated from service notes ;
" CAMSHAFTS: The later camshafts are tuftrided ña process which gives hardness without losing toughness. It can be
recognized by an even brownish grey color all over the shaft. Many dealers may still have earlier shafts on which the
cams are bright and these are not so good. so if you are after a cam, shop around. Avoid the SS cam like the plague--it
is nothing but trouble in a road bike and is slower than the ordinary cam (which was, after all, the grind used for those
650 production wins at Thruxton -- you remember, in the good old days when Notions won races), It is a good plan to
ease the end of the cam where the sprocket fits, so that this too can be pulled off easily -the next time. Never hammer
the cam nut tight without a cutaway timing cover or all your work getting the idler spindle tight will he undone. Even
pressure is sufficient and will cause no trouble.
A box spanner is preferable here, as the nut is shallow and slightly recessed ; a ring will tend to slip.
The "SS" cam mentioned here is the Commando SS cam or double S as used in the Combat engine (Interstate) as
opposed to the Commando standard cam which stemmed from the 650 SS profile mentioned. Referred to as the
"SS" because of its origin. This standard cam profile is as used on tire Atlas as well, and is now reverted to for
the 850s.
CAM BUSHES: If you are unlucky enough to have a pair of cases with steel cam bushes (they are bronze faced. but
can be recognized by the X-shaped oil grooves in the bronze surface of the bush), you must use bronze faced thrust
washers each side of the timing side crankcase. Break off the tabs which locate the washers in the hole alongside the
bush or they will break off in use. They are exactly the right size to drop into the crankcase and pass up the oil return to
the oil pump, "is seizes the pump, stops the oil supply, and within a very few yards the evidence disappears through the
bottom of the crankcases. There is no sump filter on the 1972 crankcases, and these are the ones with the steel hushes.
Very clever,
Further if; the steel cam bushes with "X"' oil grooves. or scrolling - these may be used with a plain or scrolled
camshaft. On no account fit a plain camshaft in plain bushes. Plain bushes were fitted to early engines and are
now being used again. "
THOUGH I consider a 2S cam , in a appropriate set up suitable , as it will pull from 1200 , or 2000 , or 3500 .
But when its past 4000 That is PULLING . So if theres no speedlimits and you dont live in Town , you may not
get arrestted with a 2S cam. anything applying to that I think would apply to a 4S also .
I believe the T indicates "standard" as in stock.
That being said, if the journals on the ends are within specifications it can be considered as a good donor for remanufacturing (welding up and regrinding to suite) a new cam, otherwise it is junk (giunca).
That being said, if the journals on the ends are within specifications it can be considered as a good donor for remanufacturing (welding up and regrinding to suite) a new cam, otherwise it is junk (giunca).
- Status