Cylinder -MALOSSI MHR alloy 177 cc 3 Ports, 57mm stroke, double exhaust port- Vespa P125-150

Preview: Cylinder -MALOSSI MHR alloy 177 cc 3 Ports, 57mm stroke, double exhaust port- Vespa P125-150

Description

Malossi has extended its cylinder range for the Vespa largeframe engines with 125-150ccm (Sprint, PX, Cosa, LML) by the three cylinder versions Sport 177ccm, MHR 177ccm and MHR 187ccm.

They are completely new designed and have nothing to do with their predecessor made of grey cast iron and only 166ccm. The aluminium used as cylinder material makes the kit thermally more stable than the 166cc cylinder and now allows a Ø63mm bore. Externally the cylinders are almost identical. All three versions use the same cylinder head and the same piston (but the piston of the sports cylinder has two piston rings). The formerly patented CVF II system has been dispensed with, instead the overflow channels have been significantly enlarged. An adaptation to the engine housing is therefore mandatory for full power/torque.

MALOSSI 177 MHR57
The MHR cylinder range is aimed at the advanced tuner who wants to get the most out of his engine. A corresponding knowledge of the complex thermodynamic and mechanical processes in the engine is tacitly assumed here. A nice feature is the screw-on exhaust flange. This allows a further reworking of the exhaust port which can greatly increase the performance of the cylinder. Malossi states the achievable power at delivery with 21-28PS.

Stroke x bore: 57xØ63mm
Displacement: 177,59cm³
Exhaust angle: 178,2°.
Angle of overcurrent: 119.2°.
Exhaust angle: 29,5°.
Pinch point: 0.7mm (piston is 0.2mm back in the top dead center)
Compression: 1:11,25
Overcurrent channels: 7
Piston rings: 1
Ignition timing: 18° f.o.t.

A major revision of the original rotary valve inlet is recommended, better in terms of maximum performance and driveability is the conversion to a diaphragm controlled inlet. The BGM BigBox Sport or the RR-Box are suitable as exhaust systems. Both support the cylinder very well in the intended speed range and allow the full potential of the cylinder to be exploited.

Also available as version for 60mm stroke.

NOTE: The high bolt heads of the exhaust flange plate can be in the way of the exhaust manifold clamp. It is best to replace them with flat head bolts from the outset (part number: 3333891)

(US211118)

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€449.00 *

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OEM numbers (for comparison purposes only)
Malossi	3117163, M3117163

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