Highest Retirement Ratio

Finishing position:

Pos	Engine Manufacturer	Retirement Ratio	Retirements	Races
1	Milano	100.00%	3	3
	Cummins	100.00%	2	2
	Bugatti	100.00%	1	1
	JAP	100.00%	1	1
	Kuchen	100.00%	1	1
	Simca	100.00%	1	1
	Jaguar	100.00%	1	1
8	ATS (Ita)	84.61%	11	13
9	Motori Moderni	83.75%	67	80
10	Weslake	82.60%	19	23
11	Simca-Gordini	77.77%	14	18
12	Butterworth	75.00%	3	4
13	Lancia	72.72%	8	11
14	Arrows	68.75%	44	64
15	Pratt & Whitney	66.66%	2	3
16	Tecno	64.28%	9	14
17	Francis	61.76%	21	34
18	Veritas	61.53%	8	13
19	Vanwall	60.56%	43	71
20	Novi	60.00%	6	10
20	Scarab	60.00%	6	10
22	Gordini	58.77%	67	114
23	Alfa Romeo	58.39%	299	512
24	Hart	57.36%	218	380
25		57.14%	4	7
26	Alta	56.96%	45	79
27	Supertec	55.10%	54	98
28	Zakspeed	54.80%	57	104
29	ERA	54.54%	6	11
29	Aston Martin	54.54%	6	11
31	Megatron	53.19%	50	94
32	European	50.00%	17	34
32	Speluzzi	50.00%	1	2
34	Peugeot	49.13%	113	230
35	Yamaha	48.46%	126	260
36	Talbot	48.19%	40	83
37	Maserati	48.05%	272	566
38	BRM	47.53%	366	770
39	Ilmor	47.50%	76	160
40	Offenhauser	47.46%	187	394
41	Repco	45.56%	36	79
42	Plate	44.44%	4	9
43	Matra	44.26%	81	183
44	OSCA	43.75%	7	16
44	Osella	43.75%	7	16
46	Asiatech	42.64%	29	68
47	Lamborghini	42.57%	109	256
48	Bristol	42.55%	20	47
49	Judd	40.94%	165	403
50	BMW	40.82%	287	703
51	Castellotti	40.00%	2	5
52	Mugen-Honda	39.79%	117	294
53	Ford	39.78%	2615	6573
54	Climax	39.04%	312	799
55	TAG	36.29%	49	135
56	Fondmetal	35.29%	12	34
57	Acer	32.35%	11	34
58	Petronas	32.02%	98	306
59	Playlife	31.63%	31	98
60	Cosworth	31.55%	219	694
61	Toro Rosso	30.00%	12	40
62	Honda	29.44%	384	1304
63	Renault	26.81%	718	2678
64	Toyota	23.96%	110	459
65	Ferrari	23.69%	1000	4221
66	Mecachrome	21.87%	7	32
67	Porsche	21.73%	20	92
68	TAG-Heuer	20.96%	26	124
69	Red Bull Ford	16.66%	2	12
70	Mercedes	14.92%	444	2974
71	BWT Mercedes	13.15%	10	76
72	Red Bull	11.95%	11	92
73	Honda RBPT	7.77%	23	296

Finishing position: