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2.1
FUNCTIONS OF THE ROTARY ENGINE
Aixro's XR50 is a 4-cycle rotary piston engine based on the Felix Wankel patents. Like other
racing 2-cycle and 4-cycle rotaries, the XR50 is lubricated by a 40:1 fuel/oil mix.
The XR50's rotor revolves around an eccentric crankshaft, which eliminates oscillating masses
to produce a unique, vibration-free experience. The rotor spins at 1/3 the rotational speed of
the eccentric shaft, igniting one of its three chambers each revolution.
Rotary engines offer many special advantages when compared to conventional piston engines.
These include vibration-free running (due to evenly balanced rotating masses), very compact
construction, outstanding power-to-weight ratios, outstanding low-rpm torque, and very low
emissions.
The primary components of the Aixro XR50 include:
water-cooled casing (called a trochoid, due to the shape of its interior outline)
•
rotor and gaskets (similar, in function, to conventional pistons and rings)
•
eccentric shaft (similar to a conventional crankshaft)
•
water-cooled side plates
•
The XR50 makes use of a carburetor to deliver a 40:1 fuel/oil mix (approx. 2% oil). Due to the
high operating temperatures of the rotary, the oil burns completely without the environmentally
harmful residues normally associated with 2-cycle engines.
At low rpm, fresh air and fuel (pre-mix) passes through a side plate before going through the
rotor and into the opposite side plate, cooling the rotor, bearings, and eccentric shaft. From
there, the air flows into the combustion chamber.
At approx. 5500 rpm, a vacuum-actuated valve opens, and the air/fuel mix is able to flow
directly through the periferal port and into the combustion chamber. This increases efficiency
at high rpm by allowing more oxygen into the chamber, which adds to the enormous
performance of the XR50.
These and other special processes (unique to rotary engine architecture) produce a fraction of
the harmful emissions of comparable 2-stroke engine, and are on par with some of the best
racing 4-strokes.
For even cleaner performance, the XR50's high operating temperatures allow it to be fitted with
a catalytic converter.
PRODUCT DESCRIPTION
RENNTECH
/ AIXRO XR50 ENGINE OPERATOR MANUAL
2
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