the lineweaver cam LX2

Any chance of a future dyno comparison between the X2 and 53 ?

Lloyd

Not at all, and am in fact contemplating one of Dales cams when I replace the rollers next time. Sounds like it works fine. The thought of the roller needles ending up in undesireable places scares me worse than a flame out or two! Actually though, :idea: I think the undesireable whango bango turbo laminate whatchamabob is in fact the balancer.
Dan

cant belevable

has any one ridden an o4 or o5 model?
said failure does not exsist anymore,
sm,flat track are forms of racing bike was not built for!
said failure will accure on all brands in this form of racing
verse moto & offroad.husaberg rolled the rock from ontop
of the hole along time ago guys.

cams & such

thank's taffy your really watching things!
if cams were said bad why dont i have any valve train problems
even after 1500 mi,01 650 fe? desert bike is used as,
heavy throttle settings, no problem!!!
02 470 had better numbers, problem's on this site are sometimes
cantbeliveble!

Hi Rick,
I certainly hope you knocked on wood and / or had your fingers crossed prior to making the following statements lest they may come back to bite you:

"said failure does not exist any more"

"why dont i have any valve train problems even after 1500 mi"

"02 470 had better numbers"

Hope all is well with you.


Best Regards,
Dale

While you are figuring things out, if a little silver will help to get some Dyno results on cams let me know. What cam would have been in my 2000 FC 501? Boy, that thing had a jillion hard hours on it and never even had a roller go out? It lasted like my 96 with a C cam, but the performance was way different with the 2000 having much stronger (maybe more abrupt is more accurate) low and mid.

Dan

Boy, I must have been saying the right # of Hail Marys with that 2000 to never have cam follower brg. problems. Hope the 03 follows suit and I'm knocking on wood here. (Clarify...Not Rodney Carringtons version of "Wood")
Dan

For Clarification:
In general it is neither camshaft nor followers which fail. The needle bearings and / or shaft of which the follower rotates, inlet valve face, camshaft support bearings and valve springs are most often the victim.

The Hertzian load of the needle bearing / axle is excessive with late model OEM camshaft profiles. In addition high velocity valve seating induces valve recession in particularly regarding the larger and often inferior inlet valves.

Springs react to the harmonics generated by rapid cam motion.

For reference:
Hertzian contact area, n-the apparent area of contact between two nonconforming solid bodies pressed against each other, as calculated from Hertz' equations of elastic deformation.

Hertzian contact pressure, n-the magnitude of the pressure at any specified location in a Hertzian contact area, as calculated from Hertz' equations of elastic deformation.

Hope this helps.

Best Regards,
Dale

PS
Do not simply rely upon minimum radial follower movement and / or smooth operation as assurance that all is well. The time from initial damage (which is often undetectable via the simple wiggle test and / or smooth rotation) to complete failure is short. If in doubt disassemble the followers and have a look at the pieces. If you see gray and / or detect a ridge in the shaft replace the assembly immediately.

As my momma always said "An ounce of prevention is worth a pound of cure"

Huh? That explanation sure leaves a guy feeling a bit inadequate.
Better get to Hastings for more books from guys like Jennings and Cameron and less from those English Walker and Falloon guys.
Dan

dsducati said:

Huh? That explanation sure leaves a guy feeling a bit inadequate.
Better get to Hastings for more books from guys like Jennings and Cameron and less from those English Walker and Falloon guys.
Dan

Click to expand...

Hi Dan,
Reference "Tribology" and "Machine Performance" literature.

Tribology:
The science of the mechanisms of friction, lubrication, and wear of interacting surfaces that are in relative motion.

The reading is not particularly entertaining, however, such does provide for a good foundation when one is faced with hard part failure analysis.

Hope this helps.

Sincerely,
Dale

Will check it out, probably enjoy it since 2 stroke tuners guide by Jennings was one of my favorite reads. That man gave me the confidence to port cylinders and whack on pipes. My first wife always thought I was a bit demented for such antics, but I did make some friends at Aircone & CC specialties.
Dan

Hertzian Pressures in depth

Dale, I must say, the more you offer to this forum, the more impressed I am with your complete knowledge of engineering!! I say this with the utmost respect!

I actually just learned what Hertzian pressures are from a coworker/professor about a month ago. I would love to offer a bit more than you, possibly in a manner that everyone can understand (and, since I have time to ramble on my lunchhour). Now, I don't know too much about this, nor the math behind it (yet!), but I was explained a simple example that really allowed me to understand. It goes something like this:

18 wheelers drive along the highways. The load each tire applies can be somewhat considered a point load (but it is actually a pressure=force/area). As this truck drives, each tire is actually deforming the road below it, however small it may be, but deforming it. This produces stresses in the surface material of the road.
Let us take a look at the upper 2 inches of asphault. Have you ever noticed that the highway often has patches of missing asphault (a.k.a. potholes!). If you start to notice these on certain roads, you will see that they are only about an inch deep, with good road surface below them. This is because of Hertzian pressures. What hertzian pressure tell us is that the area of highest stress on the material, is actually not the surface, but located some distance below the surface. Hence, why the pothole is only an inch deep, when there is 2-4 inches of asphault. The highest stress is an inch below the surface, causing that piece above it to sheer away from the piece below it, eventually "letting go" and creating a pothole.

Same applies to the rocker needles bearing, as Dale pointed out (of which, had he not pointed it out, I wouldn't have guessed it or thought about it, but now it makes perfect sense why these bearings fail).

Now, that is a generic example, actual numbers can vary blah blah blah.

This is also applicable to just about any bearing, I would believe.

Dale, did I get that right???

Hi Luke,
Correct indeed.

My mentors are Jim and Barbara Dour owner / operators of Megacycle Camshafts to whom I owe a tremendous debt of gratitude.

Sincerely,
Dale

Taffy,

You aren't being ignored, you are doing a fantastic job of letting the Husaberg community know about the new cam.

From your testing, you have resolved that the LX2 cam seems to solve many of the issues that have been occuring with the late model berg motors, correct?

Taf, it sounds like you have some "sand in the private parts area"!

Have you had your evening pint yet???

Did you change anything btw ride one and ride two? Maybe your bike was pissed at you the first ride, and when it finally realized that after it gets run, it doesn't hurt so much, and decided to run better? Maybe atmospheric changes had something to do with it?

Don't worry buddy, we still love ya, no need to get upset!!!!