Technology

How the components of the Rover Scarab are arranged.
In this sketch, the general lines of the Rover Scarab can be seen, with the arrangement of the engine clearly visible at the rear. The engine unit is mounted on the side frame members, which are quite straight and "unfolded", the whole assembly hanging, as it were, on a cross member, which in turn rests on coil springs next to the wheels. The layout is completed by transverse radius arms.

Arrangement of 7 hp Type ‘V’ Engine
Although closely following motor cycle practice and having rather too generous porting for good low-speed performance, the Scarab engine differed from proprietary vee-twin air-cooled engines in having wet sump lubrication and coil ignition, the distributor being driven from a skew gear on the halt-time shaft.
Source: Autocar

View of the drive unit of the 'Scarab'
The front suspension was of refined sliding king-pin layout, embodying an oil reservoir at the bottom of the king pin carrier; air trapped inside the casting acted as a crude damper.

Note:
Unfortunately, we do not have the legends to the technical illustrations.

Right:
The front suspension was of refined sliding king-pin layout, embodying an oil reservoir at the bottom of the king pin carrier; air trapped inside the casting acted as a crude damper.

The simple two-bladed fan can be seen between the cylinders of the engine. The power unit was designed for the job and was not a proprietary motor-cycle unit.
Source: Autocar

This view of the car clearly shows that the space under the 'bonnet' was not used as a luggage compartment, but for the feet of the driver and passenger - the position of the pedals clearly shows this. Above the support cross, the spare wheel has its place.
Source: Autocar

Finally, another prototype:
Motor plough with SCARAB - engine

Source: Autocar