Technical Specifications

Technical
Specifications

This page is still in course of preparation. More data will be added as time permits!

ENGINE DATA
Model	Cyl.	Bore (in.)	Stroke (in.)	Capacity (cc)	Comp. Ratio	B.H.P.
60 1954-55	4	3.063	4.134	1,997	6.73	60 @ 4,000
60 1956 on	4	3.063	4.134	1,997	6.92	60 @ 4,000
75 1950-54	6	2.567	4.134	2,103	7.25	75 @ 4,200
75 1955	6	2.875	3.500	2,230	6.95	80 @ 4,500
75 1956 on	6	2.875	3.500	2,230	7.20	80 @ 4,500
80	4	3.562	3.500	2,286	7.00	77 @ 4,250
90 1954	6	2.875	4.134	2,638	6.25	90 @ 4,500
90 1955	6	2.875	4.134	2,638	6.73	90 @ 4,500
90 1956 on	6	2.875	4.134	2,638	7.50	93 @ 4,500
95 home	6	3.063	3.625	2,625	8.80	102 @ 4,750
95 export	6	3.063	3.625	2,625	7.80	100 @ 4,750
100	6	3.063	3.625	2,625	7.80	104 @ 4,750
105	6	2.875	4.134	2,638	8.50	108 @ 4,250
110 home	6	3.063	3.625	2,625	8.80	123 @ 5,000
110 export	6	3.063	3.625	2,625	7.80	121 @ 4,000
NOTES: All engines (except that of the 80 which was OHV) were overhead inlet/side exhaust. The 80's engine was derived from that of the 4-cylinder Land Rover. The engines of the 80, 100, 95, and 110 had roller cam followers (tappets). The 2,625 cc engine of the later P4s was a shorter-stroke version of the P5 3-litre engine.

GEARBOX RATIOS (except 105R)
Gear	Ratio	Notes
Bottom	3.376 to 1	All cars had a 4.3 to 1 final drive ratio, except the 1957-59 60 and 75 with overdrive and all 105R, which had a ratio of 4.7 to 1. A final drive ratio of 3.9 to 1 was available as an option on 1956-59 90 models and was standard on all 95 models. When fitted, the Laycock - deNormanville overdrive worked on top gear only and gave an effective top gear ratio of 3.35 to 1 for cars with a 4.3 final drive and 3.66 to 1 for cars with a 4.7 final drive.
Second	2.043 to 1
Third	1.377 to 1
Top	1.0 to 1
Reverse	2.968 to 1