Alfa Romeo RM

The Alfa Romeo RM was produced between 1923 and 1925, based on the RL model. It was introduced for the first time at the 1923 Paris Motor Show and total production was around 500 cars. The RM had a 2.0 L inline-four engine which produced between 40 and 48 PS (29 and 35 kW). As were most of Alfa Romeo's cars, this was also used in motorsports. Three versions were made: Normal, Sport and Unificato. Sport had a raised compression ratio, and Unificato had longer wheelbase and a slightly bigger engine. The RM's top speed was around 90 km/h (56 mph).

Alfa Romeo RM
Alfa Romeo RM Sport with Castagna body
Overview
Manufacturer	Alfa Romeo
Production	1923–1925
Assembly	Portello, Milan, Italy
Body and chassis
Body style	limousine convertible
Layout	FR layout
Powertrain
Engine	1.9 L I4 2.0 L I4
Transmission	4-speed manual
Dimensions
Wheelbase	2,900 mm (114.2 in) (RM Sport)
Length	4,250 mm (167.3 in)
Width	1,680 mm (66.1 in)
Height	1,650 mm (65.0 in)
Curb weight	1,450 kg (3,197 lb)
Chronology
Predecessor	Alfa Romeo RL
Successor	Alfa Romeo 6C

Models

Model	Engine displacement	Max power	Years produced
RM Normal	1944 cc	40 PS (29 kW)	(1923)
RM Sport	1944 cc	44 PS (32 kW)	(1924)
RM Unificato	1996 cc	48 PS (35 kW)	(1925)

Alfa Romeo half-track

A very rare half-track version based on the RM was built in the 1920s. The half-track used the RM's inline-four engine modified to work with dry sump lubrication. The track used was licensed to Citroën Kegresse; only one example is known to survive.

References

Borgeson, Griffith (1990). The Alfa Romeo Tradition. Haynes (Foulis) Publishing Group Ltd. Somerset, UK. ISBN 0-85429-875-4.