AGAIN.... so how do you think the timing chajn is lubed in the breather modification where people plug the holes in the timing chest ??? How could that modification have more oil distributed to the timing side than my modification does... being that their modification looks like this
.......... and my modification looks like this
With the lower drain hole, startups would be with a dry timing chain. Not sure how that would work, long-term.
If it works, I guess it's good, but I don't see how the timing chest retains any lube. Seems like you're relying totally on breather mist from the crankcase and any oil would drain out the small hole near the pump, picked up by the sump pickup and pumped back into the tank. BSA racing experiments years ago showed running the primary drive in an oilbath made the drive chain run cooler, last longer and yielded a couple horsepower. I would think the cam drive would work the same, to a lesser degree. Dropping the oil level in the timing chest by drilling a hole level with the drive sprocket center still keeps the chain in a constant bath, but according to Jim, reduces the running temp of the timing drive while maintaining lubrication. I wish he would weigh in and tell me what I'm missing.
