Camshaft Data

[Eldert]

Jim Pianetta collected a lot of camshaft data and posted this in a PDF file on the Ducatimeccanica site

http://www.ducatimeccanica.com/JimsCamData.pdf

Eldert

[DewCatTea-Bob]

____ For my older PC & OS, either the link or the PDF-file will not load for me !

____ I have a very extensive accumulation of all cam-data from the old 200s on up but, a very small amount of missing data still needs to be found in order to be totally-complete ! _ So I very much hope that this source has at least something which I do not already have !
However it's doubtful that it will, cuz I've had to get ALL my cam-data from quite a few different official-sources, and I much doubt that anyone else in the world would have bothered to have found ALL the completely-trustworthy sources which I have found to get my cam-data from !


Hopeful-Cheers,
-Bob

[Eldert]

Hi Bob

maybe try this way : go to http://www.ducatimeccanica.com/ and scroll halfway down the page
and look under more good stuff . should be right there

Eldert

[frankfast]

So my 350 Scrambler widecase was leaking gunk out of the exhaust port so I decided to pull the head to see what was wrong. The valve seal on the exhaust valve was broken so I thought that I had solved the problem. Since there appeared to be some slop between the valve and the guide I decided that it would be a good time to install new guides. I was bothered by what seemed to be wear on the rockers where they met the cam. I also didn't like the feel of the camshaft bearing in the bearing block on the left side. I decided to pull the cam which revealed excessive wear. A shoulder on the cam lobe was created where the rocker didn't meet the cam. When I measured the shoulder on the intake side I computed the lift to be about 9.6mm which I think is correct for a green/white cam. However the part of the lobe that came in contact with the rocker only measured 7.4mm of lift. The exhaust side also indicated wear but not as excessive as the intake. Has anyone seen this amount of wear at the cam? The bike obviously was abused and I suspect that oil was not reaching the cam. The bike was pulled from a junk pile in back of a gas station but I got it running and decided it would make I nice little street bike. Anyway, it looks like I'm in need of a cam(at least) but since this is not a restoration but a budget project, any help with finding one would be appreciated. Thanks for listening to my plea.

[Bevel bob]

Pretty bike,check the oilway thro the barrel and head are clear, they can easily block with this low pressure system, there should be a roll pin reducing the flow out at the bevel end of the cam sending oil to the cam lobes.to, check oil is returning leave off the banjo bolt on the bevel drive tunnel, messy !!.Use monograde oil??.Cams and followers can be repaired.

[frankfast]

Are you aware of anyone that does this work in the good ole USA or the UK?

[Pete]

Where are you located?

[frankfast]

New York

[DewCatTea-Bob]

" I was bothered by what seemed to be wear on the rockers where they met the cam. A shoulder on the cam lobe was created where the rocker didn't meet the cam. When I measured the shoulder on the intake side I computed the lift to be about 9.6mm which I think is correct for a green/white cam. However the part of the lobe that came in contact with the rocker only measured 7.4mm of lift.
Has anyone seen this amount of wear at the cam? "

____ Sure have! _ And much more than that too !
I have a good deal of experience with DUKE cam & rockers, and if the oil is taken well care of, wear of these parts is not usually a problem !


" I suspect that oil was not reaching the cam. "

____ Usually any wear on the cam-lobes is limited to less than 1/2mm, when due to bad oil. _ Wear like you've found is most often due to the tip-end of the oil-pimp's drive-shaft getting rounded or snapped-off.
So you should definitely pull-off your front/right-side motor-cover and check-out your oil-pump !
____ When the cam gets as worn as you've found yours to be, then the rocker-arms' cam-followers are always worn even worse ! _ So they should have very notable dual concave-indentations deeply worn into their convex-radius (of the follower-faces of each rocker) ! _ If not, then I'm quite certain that EITHER the cam was already worn-down before it was installed & then run that way against normal rockers, OR more likely, someone had noticed the original-rockers which had gotten badly worn (along with the cam), and merely replaced those worn rockers with a normal pair and then continued running the engine that way,, (for you to later find the results).
Cuz the rocker-faces should otherwise be worn well more than the cam !


Hopeful-Cheers,
-Bob

[frankfast]

You are absolutely correct. Upon further inspection of the timing side cover the tip end of the oil pump driven gear has been completely sheared hence no oil was being circulated. You are also correct in that the rocker faces are slightly concave where they meet the cam. Hats off to you. However it seems that the damage to my motor is more serious than I thought. The lack of oil circulation seems to have affected the top end more than the bottom. I haven't split the cases but the play at the big end of the crank seems ok. I'm hoping that enough oil has been splashed around the crank and transmission to keep it lubricated. I recently changed the small end bush because the piston had seized on the pin. Now I know the reason. Everything will have to be inspected to determine whether it will be worth saving. One more question. Are the timing side cases including oil pump interchangeable between widecase and narrowcase motors? Thanks for all the help.