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Unorthodox Racing

Unorthodox Racing

Ultra R Lightened Underdrive Crank Pulley

Unorthodox Racing Ultra R Lightened Underdrive Crank Pulley
  • Lightweight 6061-T6 billet aluminum
  • CNC machined to .001"
  • Real HP & torque gains across entire RPM range
  • Over 6 years of use in "real world" applications from street to road course to rally to dragstrip...
  • Better than OEM belt fitment & alignment
  • Single belt design for race applications
  • High quality polished finish

Unorthodox Racing Ultra Race lightened underdrive crank pulleys are CNC-machined from the same lightweight 6061-T6 aluminum billet that is used for all of the Ultra Series products. Premium 6061-T6 aluminum billet ensures the consistency of the material's strength and balance. Tolerances are held to within .001" and numerous machining steps are taken to ensure they are the lightest possible design.

Unorthodox Racing Ultra Race crank pulleys go even further than the Street versions to provide you with the highest possible power gains. Unorthodox Racing Ultra Race crank pulleys are a single belt design, only driving the alternator, and in some applications the water pump (when not driven off the cam belt). No other accessories are driven by this pulley. This makes for an extremely light piece that will provide you with even higher power gains than the Ultra Street crank pulleys for the same application.

For the current Ultra Race lineup, gains of 6 to 14 HP and 5 to 12 lbs.-ft. on normally aspirated engines and 10 to 18 HP and 7 to 14 lbs.-ft. on forced in duc tion engines can be seen. These are average gains. Higher gains can be realized on any modified engine.

These power gains are obtained in a few ways. First, and most important, is the weight loss. There is an average of 2.7 HP gained from every pound lost off the crank shaft. 85% of the gains are from weight loss.

Second, you are not driving any accessories with the Ultra Race crank pulley except the alternator (and water pump in some applications). The rest of the gains are from the underdriving, which accounts for about 15% of the total gains.

Underdriving in the Ultra Race applications ensures charging systems can supply the required voltage to the computer and ignition systems when running at the track. Ultra Race crank pulleys are also perfectly streetable and can be used in applications where the A/C and P/S have been removed for street use. Ultra Race lightened underdrive pulleys are available in a natural polished aluminum finish.

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