Re: Camshaft bushes
pierodn said:
But if I mount another standard breather on blanking plate where do I send it the vent?
If i join the two vents on the tank of oil does not risk a return in one each of the other?
Thanks for the advice.
When I did this to my race bike back in the early '70s, I closed the breather hole in crankcase with a threaded plug and copper washer, and welded a suitable size tube to the blanking cover. I ran the hose from the blanking cover to the vent return fitting on the oil tank. In my case, I could no longer use the timed breather because I had replaced the camshaft with a later style without the notches to drive the timed breather disc. As MFB mentioned, I also drilled two holes in the timing side crankcase half to allow flow from the crankcase to the timing chest and out the breather tube. The later engines with the timing side breather already had connecting holes drilled in the timing side case wall. This picture of a early timing side shows the holes that Kenny Dreer added when he used it with one of his custom drive side halves.
This is a picture of a later timing side half, also from one of Kenny Dreer's conversions with his drive side half, showing the holes in the case wall.
And this is a picture showing where Kenny put the breather holes when he made his own cases, both drive and timing sides. This particular set of cases is machined for a crankshaft with larger than stock main bearings.
As you can see, the exact location of the holes doesn't seem to be critical.
As a caveat, let me point out that these are all old school breather methods, the way most of us did it in the '70s and '80s, not to be confused with the various breather systems with reed valves now being used. There's a lot of info on these newer systems in the forum threads, if you search for it, and they look like real improvements. I've modified one of my engines for a reed valve breather system, and hope to try it out this year.
Ken
