eh,
I found it quite useful I looked in Peter Miller's book" Morgan The Three Wheeler-The Complete Story but couldn't find any BHP figures for the LTOW engine
Funnily enough, my favourite application of the J.A.P engine isn't in the Morgan but in the Brough Superior SS:
http://auto.howstuffworks.com/1938-brough-superior-ss-100.htm 
G
