Mr. Rick
VIP MEMBER
- Joined
- Feb 6, 2009
- Messages
- 793
Is this newsletter avail to the public?Its all mentioned in the latest AN news letter. (email)
Is this newsletter avail to the public?Its all mentioned in the latest AN news letter. (email)
Is this newsletter avail to the public?
Although, the newsletter still leaves the question of what the issue with the cams actually was - the newsletter only says what it wasn't.Its all mentioned in the latest AN news letter. (email)
Having just read the newletter, may I post a quote that should be written on the soul of everyone with an old bike especially those of us of
a certain age:
<The way to build a Commando engine as I did in my university days, i.e. to take items out of the bag and put them together as per parts diagram is not good enough by far>
Joe, no truer words were ever spoken.
Although, the newsletter still leaves the question of what the issue with the cams actually was - the newsletter only says what it wasn't.
Quoting: "We have now put the camshafts on sale again, having understood the problems with the Australian camshafts were not caused by these but by other factors."
I seem to recall there was also a fault found with a cam AN had in their stock.
Transparency would demand that the fault(s) were made public together with the solution.
Rob
Remember WW2 anyone ? All those high lift cams in high performance Aero engines ? Many issues of course , but premature cam failure as far as Iknow was not one of them ..
Well oddly now there is an issue with premature Cam wear in piston engined aircraft of presumably much lesser power . Obviously too simple to suggest that in ww2 engines were run on monograde and now certainly not but it set a train of thought off.. When a monograde oil is hot it thins out - but what about the films that have formed on moving surfaces such as tappets and cam lobes .. as the engine cools then presumably the oil thickens and possibly film strength increases.. With multi grades however some thing else is happening
as the engine cools the oil changes grade , does this effect the film strength and make it thinner and easily wiped
off the cam lobes by the tappets?
One common factor through all these reported cam failures is ,I would wager , the use of multigrade oil , whether that has any bearing of course is another matter . Castrol R anyone?
Do I dare to ask if the timing side crankcase was modified with the 1/4" hole on your engine?
One common factor through all these reported cam failures is ,I would wager , the use of multigrade oil , whether that has any bearing of course is another matter . Castrol R anyone?
Who are you asking?
My combat cam failed and it was running on R40One very small point about valve spring pressure is that some Combats actually left the factory with coil bound springs .. and according to the itinary of faults listed in Motorcycle Sport Jan 1977 by a senior NVT Marsden Road Engineer .. premature cam wear was not one..
Remember WW2 anyone ? All those high lift cams in high performance Aero engines ? Many issues of course , but premature cam failure as far as Iknow was not one of them ..Well oddly now there is an issue with premature Cam wear in piston engined aircraft of presumably much lesser power . Obviously too simple to suggest that in ww2 engines were run on monograde and now certainly not but it set a train of thought off.. When a monograde oil is hot it thins out - but what about the films that have formed on moving surfaces such as tappets and cam lobes .. as the engine cools then presumably the oil thickens and possibly film strength increases.. With multi grades however some thing else is happening
as the engine cools the oil changes grade , does this effect the film strength and make it thinner and easily wiped
off the cam lobes by the tappets?
One common factor through all these reported cam failures is ,I would wager , the use of multigrade oil , whether that has any bearing of course is another matter . Castrol R anyone?
Nope, you lose, mine failed when using a monograde 40 mineral oil! Now using a multigrade synthetic!
My combat cam failed and it was running on R40