Race Win Ratio

until 2009 Spanish GP

Ignore Indy 500 races
Ignore non-championship races
Note: records involving non-championship races may be inaccurate due to incomplete data.

Finishing position:

Pos	Engine Manufacturer	Race Win Ratio	Race Wins	Entries
1	EMW	50.00%	5	10
2	Mercury	33.33%	1	3
3	Kollektiv	25.00%	2	8
3	Meteor	25.00%	1	4
5	TAG	18.52%	25	135
6	Vanwall	14.44%	13	90
7	Mercedes	12.37%	72	582
8	Lancia	11.43%	4	35
9	Ferrari	11.18%	290	2594
10	Repco	10.50%	19	181
11	Connaught	10.14%	14	138
12	Cosworth	8.83%	123	1393
13	Renault	8.61%	116	1348
14	Honda	8.03%	72	897
15	Weslake	8.00%	2	25
16	Simca-Gordini	7.19%	12	167
17	Climax	6.19%	130	2100
18	Simca	5.88%	2	34
19	Talbot-Lago	5.60%	19	339
20	ERA	5.29%	12	227
21	Cisitalia	5.13%	6	117
22	Maserati	5.13%	85	1658
23	Alfa Romeo	4.83%	38	786
24	Lea-Francis	4.17%	5	120
25	BMW	3.92%	33	842
26	Gordini	3.45%	8	232
27	BRM	3.34%	38	1139
28	Offenhauser	3.12%	11	352
29	Bristol	2.97%	9	303
30	Porsche	2.70%	5	185
31	Ford	2.65%	183	6904
32	Lotus	2.30%	2	87
33	Frazer-Nash	2.13%	1	47
34	MG	2.04%	1	49
35	Bugatti	1.82%	1	55
36	Alta	1.81%	7	387
37	OSCA	1.79%	1	56
38	Matra	1.62%	3	185
39	Delahaye	1.53%	2	131
40	Mugen-Honda	1.36%	4	294
41	Veritas	1.15%	1	87
42	Chevrolet	1.10%	5	453

Finishing position: