Cylinder Barrel/Oil Pump

[morningside]

I am a newcomer to the Scott world and have a couple of queries. (No doubt there will be many more) Firstly: The engine fitted to my 1948 Flying Squirrel is numbered DPZ 4156. I had assumed this was 500 cc. When sorting out some gaskets for the re-build the bore of the one I selected was smaller than the others. Subsequent measurement of the bores (+/_ 73.68 with +40 pistons) indicated that this was a 600 cc barrel.Do I have a 600 cc barrel or a bored out 500 cc one ? Secondly the oil pump is fitted with a reduction gear with no makers mark. At the top is a modern day grease nipple with the word oil stamped adjacent to it. Was the nipple intended for injecting lubricating by means of a gun and if so how much and how often ?There does not appear to be a relief hole/vent.

Thanks/Ian Moorey

[BRIAN MARSHALL]

Hi, Welcome to Scotts ! There is no difference between a DPZ and a DPY barrel except for the bore size, so there is no way of telling if your barrel has always been a 596 or is a bored out 498.
Several people have made oil pump reduction gears, and the most prolific was Gerry Howard, now retired. He used Sturmey-Archer three-speed push-bike epicyclic hub gears in his units, so they are easy to get spares for. I think that any thick oil will do to lubricate them. When I had mine I replaced the grease nipple with a Flip-flap type oiler cup, and would just put a squirt of oil into it now and again, and there is certainly no need to fill it up completely.
Brian

[morningside]

Brian,
Many thanks for your response. That nicely clears up my two queries.I like the idea of using a flip top style oiler.

Regards/Ian Moorey.

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