HOME and how to join Forum Open Area General Scott topics Best oil for bottom end Reply To: Best oil for bottom end


I think that you ought to strip your drippers and make sure that they are not gummed up, and at the same time see how your oil flows out of the supply pipes without the drippers being connected up. For reliable flow to drippers you need pipes with a minimum bore size of a quarter of an inch, especially in cold weather. You must be able to achieve around 10 drips per minute in each sightglass for safe running. For many years Scott owners have typically used 40 grade oil in summer, and 30 grade in winter, but of course some folk have other ideas!
Also blow out the pipes between drippers and engine. You will have to turn the engine over slowly by hand to find the point at which the holes in the “timed” sealing glands open, and then air and/or oil should flow freely. The opening point for the oil holes in the glands should be at the point when there is maximum suction in the crankcase, typically as the piston is rising up to compression, but before the transfer ports open. There are different types of gland for drippers and pumped oiling, and they can have one, two, or three holes, and some even have slots instead of holes! Refer to “Technicalities” for more information.
I just hope and pray that your engine has the correct type of glands for drippers, AND that your engine hasn’t been assembled with the glands in the wrong side of the motor as they are handed. Good luck!!