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evosport's T-6061 aluminum, hard anodized pulleys account for a 10- to 20-percent decrease in accessories speeds, reducing the load on the engine. The pulleys were good for 10.7 wheel hp at 6960 rpm and 8.1 lb-ft of torque at 5550 rpm and 6960 rpm.
Project BMW M3 Part 6: Cams, header and pulleys

 evosport's T-6061 aluminum, hard anodized pulleys account for a 10- to 20-percent decrease in accessories speeds, reducing the load on the engine. The pulleys were good for 10.7 wheel hp at 6960 rpm and 8.1 lb-ft of torque at 5550 rpm and 6960 rpm.  View Related Article

 

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