HOME and how to join Forum Open Area General Scott topics FL engine number. Re: Re: FL engine number.


Although I’ve never seen one of the FL prefixes I would take a guess as Brian mentioned that they were stationary engine crankcases. With FY and FZ the F meant a 68.25mm stroke but the Y giving a 600cc and the Z a 500cc, letters which ID’s later engines of those capacities too.

However… there were LFY and LFZ numbers issued in the early-mid 1930’s. Just to confuse matters they had a 71.4mm stroke.

So as a guess I would say the FL was a short stroke stationary engine of niether 500cc or 600cc, perhaps less than 500cc. Knowing what Scott was like perhaps a 68.25mm stroke and a 66.6mm bore to give a low revving high torque engine favoured in stationary applications.