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Rolls Royce Phantom 1 (1925 - 1929)


Rolls-Royce Phantom I, 1927, H.J. Mulliner Weymann Saloon

With the launch of the Rolls-Royce New Phantom in May 1925 it became instantly obvious that Rolls-Royce had put to good effect the experience that the company had learned in the eighteen year production period of the R-R Silver Ghost. Though not just a spearhead of innovation the Rolls-Royce New Phantom, later usually listed as Phantom I, featured an all new pushrod-operated overhead valve engine with detachable cylinder heads. From 7,668 cc the engine provided sufficient power to accelerate from walking pace to top speed. Indeed three of the four gears were almost redundant apart from starting from rest or on Alpine passes. - In this respect as well as in every other detail the New Phantom was a worthy successor to the universally acclaimed Silver Ghost. 2269 Rolls-Royce Phantom I cars were made in the UK.

Wheelbase 3658 mm 144 in  
Track front 1473 mm 58 in  
rear 1473 mm 58 in  
Length 5563 mm 219 in  
Width 1829 mm 72 in  
Manufacturer Rolls-Royce
Type S-6
Wet sumped
12 valves total
2 valves per cylinder
Main bearings 7
Bore stroke 108.00mm 140.00mm
4.25 in 5.51 in
Bore/Stroke ratio 0.77
Displacement 7668 cc
(467.93 cu in)
Unitary capacity 1278 cc/cylinder
Fuel system 1 R-R carb
Aspiration Normal
Max. output 96.3 PS (95.0 bhp) (70.8 kW)
@2750 rpm
Coolant Water
Specific output 12.4 bhp/litre
0.2 bhp/cu in
Top speed 145 km/h
Engine location Front
Engine alignment Longitudinal
Steering worm & nut
Suspension Front LA.SE.
Rear LA.Cant.
Wheels F/R 6.75 x 21/6.75 x 21
Tyres F 7.00 x 21
Tyres R 7.00 x 21
Brakes F/R Dr/Dr-S
Transmission 4M
Drive RWD
Top gear ratio 1.00