Model Engine displacement Power output (max.)
1886 781 cc (47.7 cu.in.) 18.0 HP at 3,600 rpm
HT20 880 cc (53.7 cu.in.) 20.0 HP at 3,600 rpm
HT23 946 cc (57.7 cu.in.) 23.0 HP at 3,600 rpm
QS-16 588 cc (35.9 cu.in.) 16.0 HP at 3,600 rpm