Archie wrote:
http://www.nova-racing.com/nova_gb/index.htm
Società ITALSISTEM S.r.l.
. _
ITALSISTEM - Achille Parrilla - is one of the most successful Kart engines and
chassis producer in the world. Plenty of championships were won by products of
Achille Parrilla.
ITALSISTEM has the experience and the equipment to produce and to develope high
performance racing engines for Karts.
In the year 2002 an agreement was made between ITALSISTEM and Woelfle
Engineering GmbH which has experience with rotary engines.
Founded in 1996, Woelfle Engineering GmbH is active in the design and
development of machinery for the Textile and Plastics Industries embracing various
fields of mechanical engineering technology. Additionally, for the past 25 years,
Director Paul A. Woelfle has been personally involved in karting.
Well known drivers such as Ellen Lohr,
Nick Heidfeld and H.H.Frentzen began
their careers with Paul.
Active participation in national and
international karting competition enables
Woelfle Engineering GmbH to be fully
aware of the current and future demands
placed on engines especially in the
area of environmental protection.
The XR8 is a 4-stroke rotary engine working on the Wankel principle and consequently has
no oscillating masses due to an eccentric shaft and rotor turning at 1/3 shaft speed.
During each full rotation of the shaft one of three chambers is ignited.
As all the moving mass is balanced, this type of engine layout is free from vibration,
extremely powerful, compact in size and produces low emissions. (see performance diagram)
Today's rotary engines are capable of highest run performance. Therefore they are
predominantly used in small, sometimes unmanned aircrafts.
The engine's main components are typically the following:
* Water-cooled housing, often called trochoid due to its inner shape.
* Rotor with seals (equivalent to a piston with ring)
* Eccentric shaft (equivalent to the crankshaft)
* End plates, which close the sides of the engine and support the shaft >
The XR-8 is a carburetor engine with mixture lubrication at a ratio of 50:1, but unlike in
2-stroke engines all oil is combusted without residue.
Fresh gases initially flow through one end plate, stream through the rotor, bearings and
shaft cooling and lubricating, before passing into the combustion chamber through the
opposite end plate.
At ~5500rpm a negative-pressure controlled butterfly valve opens a second port feeding
additional gases directly into the combustion chamber.
These cold gases give rise to the enormous power of the XR8. The untypical processes in
the engine result in very long control times that positively influence exhaust gas values,
which are typically under 1% of comparable 2-stroke units and equal to the best 4-stroke
levels.
The engine can also be operated with a catalyzer.
Technical Data
Specification:
Type 4-stroke 1-disc rotary engine
Power:
31 kW [41 HP] ata / 7800 rpm
Weight:
~ 15 kg [33 pounds]
Drehmoment:
47 Nm bei 4500 1/min
Chamber volume:
294 ccm
Max. engine speed:
10,300 1/min [RPM]
Clutch:
2-disc centrifugal
Drive:
1/2 " chain type 428
Ignition:
magnet ignition with variable timing
Housing:
water cooled, partially Nicasil coated
Housing end plates:
water cooled, special alloy
Basic engine units
are supplied with:
Carburetor
Ignition unit
clutch (chain type 428)
Engine mount
Fuel pump
Engine cover
Off switch
Operation manual
Exhaust
Price without water cooler,
water pump, water tubes,
chain and sprocket
EUR 3.886,-
(inkl. 16% VAT)
Price with
water cooler,
water pump, water tubes
EUR 4.095,-
(inkl. 16% VAT)
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