engine numbers

[ERIC BAYLISS]

Can any one tell me what zp stands for after the engine number, its in very small letters also on the back of the blind head barrel its got R 5 13
16 thanks Eric

[BRIAN MARSHALL]

Hi Eric,
I have never seen ZP stamped on an engine and have no idea what it could stand for, although Z as a prefix rather than as a suffix, normally means 498cc, and Y as a suffix means 596 cc. Similarly P as a suffix means a ‘Powerplus’ longstroke. The 5 13/16 stamped on an angled flat on the top of a blind-head barrel is just the compression height, in inches.
Brian

[ERIC BAYLISS]

Thanks Brian. talking to other Scott owners some one did suggest that as it is a pz engine uprated to 600 it could have been done for someone special and that the zp is his initials, or even the initials of the person that built or rebuilt it. like Rodger puts on the engines he does. Just another one of lifes mysteries that we shall probably never know.

[Author]

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