Technical Specifications; Installation Instructions - Malossi GORILLA ARM Manual De Instrucciones

GORILLA ARM
Racing engine mount, variable pitch,
Patented
One patent, 4 inventions:
• Variable pitch;
• Variable barycentre;
• Rigid engine fulcrum;
• U-box structure, 15,000 newton rolling resistance.

Technical specifications

Variable pitch - Variable barycentre
Gorilla Arm: The engine mount, which has become
an integral part of the frame, is blocked by two
adjustment cams placed within the central tube, and
opposed by two rebound bumpers.
Five diff erent inter-axial distances and five diff erent
drive axles, which determine as many vehicle
barycentre, may be obtained by a simple rotation
acting on the two cams. Three holes made in the
same cams allow obtaining a further three macro
adjustments of the wheel inter-axis according to
the chosen hole, when installing the original tie
rod fixture.
Now there are 15 adjustments.
To be perfectly precise, as there are 2 holes in the
reaction point of the arm where the two bumpers
are fix ed, by moving the latter from one hole to the
other, the number of adjustments doubles.
Rigid engine fulcrum
Unlike the original arm and others which are
elastically mounted, Gorilla Arm was designed as an
extremely solid rigid element, tested for supporting
extreme stress; notwithstanding the infinite number
of adjustments available, it is blocked on the frame
of which it becomes an integral part, leaving the
engine free to oscillate and eliminating a fragile and
unstable double joint which would not allow accurate
and safe driving.
U-box structure
Once the connecting tube of the original arm to
the engine had been eliminated in order to leave
room for the exhaust system, the designer turned to
the "resilience" of the swinging arm, as the original
was obviously designed for an easy-going scooter.
Sums no longer add up; it is necessary to recalculate
everything for an engine five times as powerful and
fast. He therefore introduced a U-box structure with
4 steel arms each 4 mm joined together by two
steel plates each 2 mm which include a ø 45 mm
tube, 2.5 mm thick. Laser-cut, it is all joined by TIG
welding at specific points, the result of structural
calculations and it reaches a 15,000 newton rolling
resistance over 2,000 cycles. This cannot be
compared in any way with the original or with others
commercially available.
It is pickled and painted with a transparent oven-
treated varnish and comes complete with all
particulars, including instructions for installation,
which causes no problems at all as it is totally
interchangeable with the original.
Installation instructions (p.13 - 14)
Follow the diagram.
The engine mount is multi-adjustable and the vehicle
inter-axis and engine swing arm may be varied
according to requirements.
5