Camshaft

[rec409]

pm sent

[rec409]

Like this but better focused!

Thank you for this Crofter big help..

[rec409]

so is there any new news?

I want one...

[rec409]

hmmm I guess this camshaft thingy drowned....bummer.

[JohnF]

There are two twin camshafts being tested right now.  I just sent down the components for 30 more, but also have to bring in cam weights (Indians forgot to put them in the order) from India.  Hopefully we will have all the component parts under one roof in a week or two.

[mike90045]

Thanks for the update. many are watching

[rec409]

There are two twin camshafts being tested right now.  I just sent down the components for 30 more, but also have to bring in cam weights (Indians forgot to put them in the order) from India.  Hopefully we will have all the component parts under one roof in a week or two.

very good John,
thank you for this update very interested. also is there any update on a possible run of Hollow Dippers???

anyways thank you for all your efforts on all this John...

Rob

[mike90045]

very good John,    thank you for this update very interested. also is there any update on a possible run of Hollow Dippers???
anyways thank you for all your efforts on all this John... 

And then we need a run of plain bearing shells to go with them.    Having not opened my up, is the top shell (with oil holes and grooves) not interchangeable with the bottom shell ?  Does a oil hole come pre-drilled in the plain bottom shell, or does that have to be done?  any oil groove need in the bottom to spread oil around, or only for the top in gravity drip mode?

[rec409]

very good John,    thank you for this update very interested. also is there any update on a possible run of Hollow Dippers???
anyways thank you for all your efforts on all this John... 

And then we need a run of plain bearing shells to go with them.

i second that.

[JohnF]

Mike;

The plain bearing shells are not interchangeable top and bottom.  The top is completely plain, no holes, no oil grooves.  The bottom one looks pretty much like a standard bottom shell, it has the oil hole and the oil distribution grooves.  It is those grooves that force the oil up into the top shell.

[rec409]

any new news? were dying to hear how this is going.......??

[rec409]

ummmmm.? bump

[JohnF]

Slowed down a bit due to the fact that the Indians did not send me all the parts (grrrrr!).  I have everything except the little collars the governor arm rides in.

But, while we were spinning our wheels, we had another engineer have another look at the firing sequence of the twins vs. the cam positioning.  He tells us that the ideal degree of separation between intake and exhaust cams is 102 degrees.  However, on the camshafts provided (the 2 or 3 he has looked at) the degree of separation on cylinder #2 is about 97 degrees.  Doesn't sound like a lot UNTIL you realise that this means the second intake cam is opening against the pressure of the compression stroke from cylinder #1.  Add that to all the other little problems (camshaft it self too soft, centre bearing too sloppy, end bearings marginal) and he says the camshafts "don't stand a chance".  The shaft is being flexed badly every time it turns, this is also leading to excessive wear on the gear train (it is likely not the bad positioning of the idler, although that does play a small part).

Now I just have to get all the bits under the same roof and we can get going on this...

[Horsepoor]

Very interesting 102 degrees vs 97 degrees, please keep us posted on your progress. I enjoy reading your analysis.

[vdubnut62]

I am interested in seeing how "6 degrees of separation" affects fuel economy, not only longevity.
Ron