Guess there may be a "2" missing, could have been 24 sec?
The late split beetles and early ovals were 1131cc's, (75mm bore). Compression ratio was 5.8:1 to be able to use the poor quality fuel available at the time.
Somewhere around 1954 capacity was increased to 1192cc's, (77mm bore).
Original beetle, (around 1938- 1939), had 986cc's from 70mm bore. In 1939 capacity was increased for use in the Kubelwagen, which had more weight.
Up to 1192cc engines all used 64mm stroke.
Staying Aircooled is so much nicer.
Do'nt assume anything- (While doing fault-finding).