I got my newly acquired E3T engine today and am quite excited
I didn't realize it is an all alloy motor. (Currently painted black)
Were all the 490cc engines alloy?
It is supposed to be 1949.
Does it have a year stamped on it ?
The engine number would say for sure what year it is,
E indicates a 1950 manufacture.
1949 ran from approx 18000 to 25000, 1950 to 33000 give or take a few hundred.
The 3T says is a rigid framed Trials Model.
The vast majority of 490cc engines in that era would have had an iron head on an iron cylinder, with steel pushrods. = HEAVY !!
All alloy engines were limited to the trials models - and may even have been optional.
That shape of crankcase only started for 1948, so it can't be any earlier than that, and alloy heads only started for the general run of bikes in I think 1955.
Road bikes (ohv) would never have had alloy cylinders, although the cammy models did in the 1950s.
It does make the engines slightly noisier.
Does it say Wellworthy on it anywhere. ?
Do you have a bike to put it in ?!