Sirio SIR21CL7BSTI .21 Buggy Engine ABC 5+2 Ports "Long Stroke"

Sirio SIR21CL7BSTI .21 Buggy Engine ABC 5+2 Ports "Long Stroke"


This engine is part of Sirio's STI engine linup. STI engines have been given
some added touches that make it comparable to a "Team" engine that are now
attainable by the general public.

These engines feature crankshafts, cases and rods that are serialized for
better quality control. The connecting rods and crank shaft are surface
treated to ensure maximum strength and performance. The piston sleeves
are hand-matched to each case to ensure smooth flow thru all ports. Each
crank is hand-selected and blueprinted for best tolerances. The bearings
are hand-matched to the crankshaft and case.

Features
Front bearing is rubber sealed
ABC sleeve has extra machine work done outside the sleeve to increase flow
thru intake ports
Aerospace coating on the crankshaft decreases wear and increases strength.

Specifications
Displacement: 3.5 cc
Stroke: 16.90mm
Bore: 16.20mm
Ports: 5+2
Piston: CNC
Sleeve: AAC
Exhaust: Rear
Weight: 322 grams
Crankshaft: 14.20mm SG Type
Carburetor: Composite / Slide / Single Adj.
Plug Type: Turbo