Not really off topic, because it was a joke based on the fact Morgans used a bunch of engine suppliers, one of which was "JAP" ...
J.A.P. (J.A.Prestwich and Co. Ltd.) V-twin engines were used by the Morgan Company from 1909 onwards in form of the KT-series (Capacity: 980cc, bore x stroke: 85.7mm x 85mm), JT-series (996cc, 80mm x 99mm) and LT-series (1096cc, 85.7mm x 95mm) and either Air-cooled or Water-cooled, SV or OHV and in different stages of tuning.
J.A.P. KTW
A.C.U. Rating: 9.80hp.
Bore x Stroke: 85.7mm x 85mm.
Capacity: 980cc.
Weight: 90lbs.
Power: 26hp at 2600rpm.
J.A.P. JTOR
8/55 H.P. Racing Engine
A.C.U. Rating: 9.94hp.
Bore x Stroke: 80mm x 99mm.
Capacity: 996cc.
Weight: 133lbs.
Power: 55hp.
J.A.P. LTOW
the "Dog-Eared" Engine.
A.C.U. Rating: 10.96 hp.
Bore x Stroke: 85.7mm x 95mm.
Capacity: 1096cc.
Weight: 128lbs.
Power: 40bhp at 4200rpm.
M.A.G. engines have been used in the form of the 2C9A (Air-cooled, 993cc, 82mm x 94mm), 2C13A (Air-cooled, 1094cc, 82mm x 104mm) and 2C20A (Water-cooled, 1094cc, 82mm x 104mm). All are IOE engines with a cylinder-angle of 45deg.
M.A.G. 2C20A
A.C.U. Rating: 9hp.
Bore x Stroke: 82mm x104mm.
Capacity: 1094cc.
Cylinder-angle: 45deg.
Power: 26hp at 2600rpm.
From Blackburne (Burney Blackburne Ltd.) the engines of the type KMA, KMB (racing engine) and KMC (sports engine) have been used with good success. Many records have been gained with the Blackburne engines between 1923 and 1930 by Norris, Beart and Jackson.
Blackburne KMC
A.C.U. Rating: 10.96hp.
Bore x Stroke: 85mm x 96.8mm.
Capacity: 1098cc.
Cylinder-angle: 60deg.
Compression: 5.5 to 1.
Power: 40hp at 4000rpm.
Precision (1919)
A.C.U. Rating: 10.96hp.
Bore x Stroke: 85mm x 96mm.
Capacity: 1096cc.
Anzani M3
A.C.U. Rating: 10.96hp.
Bore x Stroke: 85mm x 95mm.
Capacity: 1078cc.
Cylinder-angle: 57deg.
Power: 40hp at 3000rpm.
Anzani 8-valve racing engine
A.C.U. Rating: 10.96hp.
Bore x Stroke: 85mm x 95mm.
Capacity: 1078cc.
Blumfield engine
A.C.U. Rating: 8hp.
Bore x Stroke: 85mm x 96mm.
Capacity: 1090cc.
The Matchless engines finally evolved from 1933 onwards. The MX was a SV, Water-cooled, 50deg V-twin with 27.5hp at 4000rpm. It was followed by the MX2, an OHV, Air-cooled engine with 39hp at 4600rpm. The MX4 was the Water-cooled version of the MX2 and claimed 42hp at 4800rpm.
Matchless MX4
A.C.U. Rating: 9.80hp.
Bore x Stroke: 85.5mm x 85.5mm.
Capacity: 990cc.
Cylinder-angle: 50deg.
Compression: 6.2 to 1.
Power: 42hp at 4800rpm.
The Ford E93A is an in-line 4-cylinder SV engine of 933cc (56.6mm x 92.5mm, 22hp at 3500rpm) or 1172cc (63.5mm x 92.5mm) and was used by Morgan only in the "F"-type models from 1933 until 1952, when the production of the three-wheelers came to an end.
Ford E93A
A.C.U. Rating: 10hp.
Bore x Stroke: 63.5mm x 92.5mm.
Capacity: 1172cc.
Max Torque: 36.4lb/ft at 2300rpm.
Power: 32hp at 4300rpm.