Page 678 - 2017 Racecar Engineering Circle Track Parts and Accessories Catalog

HP RACING ROTORS
ULTRALIGHT 32 VENTED ROTORS FOR OE SPINDLES
Ultralight Rotors are the popular choice for dirt track and Designed exclusively for modifieds, street stocks
lighter duty pavement racing. Premium grade, long grain and other hobby classes, rotors are approved by
carbon iron provides excellent thermal stability, long life, and IMCA, UMP, USCS and USMTS. Cast from a proprietary
resistance to heat checking. UL-32 rotors are available with iron alloy to offer improved strength and durability,
straight or directional vanes for improved cooling. rotors are fitted with bearing races and 5/8" coarse
thread studs on a 5 x 5" bolt circle. Hub installation kits
UL-32 DIRECTIONAL are also available, complete with inner and outer wheel
VANE ROTORS bearings, hub seal, spindle nut, tab washer, cotter pin and dust cap.
Part No. Description
Rotor Rotor No. of Bolt
Part No. Mount Thk. Dia. Mt. Holes Hole Type Circle Weight WIL160-9239 GM Metric Rotor, 1978-Up, 10.50" Dia. x 1.00" Thick
WIL160-2894 RH 1.25" 12.19" 8 .325" 7.00" 10.5 lbs. WIL160-9240 Pinto/Mustang II Rotor, 1974-80, 10.15" Dia. x .810" Thick
WIL160-2895 LH 1.25" 12.19" 8 .325" 7.00" 10.5 lbs. WIL370-9537 Hub Installation Kit For WIL160-9239 Rotor
WIL160-2898 RH 1.25" 11.75" 8 .325" 7.00" 9.6 lbs. WIL370-9545 Hub Installation Kit For WIL160-9240 Rotor
WIL160-2899 LH 1.25" 11.75" 8 .325" 7.00" 9.6 lbs.
WIL160-2900 RH 1.25" 12.19" 8 5/16"-24 7.62" 10.1 lbs.
WIL160-2901 LH 1.25" 12.19" 8 5/16"-24 7.62" 10.1 lbs. ULGT 16 CURVED
VANE ROTORS
Curved vane, ULGT rotors are manufactured from
Spec-37, a proprietary iron alloy that is engineered
to withstand the extreme temperatures and loads
common to racing, withstanding distortion, cracking,
warping and wear.
Rotor Rotor No of Hole Bolt
Part No. Mount Thk. Dia. Mt. Holes Type Circle Weight
UL-32 STRAIGHT WIL160-13980 RH .990" 11.75" 8 .326" 7.00" 7.1 lbs.
VANE ROTORS WIL160-13981 LH .990" 11.75" 8 .326" 7.00" 7.1 lbs.
Rotor No. of Hole Bolt
Part No. Rotor Thk. Dia. Mt. Holes Type Circle Weight
WIL160-0277 .81" 12.19" 8 .325" 7.00" 8.9 lbs.
WIL160-0471 .81" 11.75" 8 .325" 7.00" 8.1 lbs.
WIL160-0483 1.25" 11.75" 8 .325" 7.00" 8.8 lbs.
WIL160-0790 .81" 11.75" 10 .325" 6.81" 9.1 lbs. DRILLED STEEL ROTORS
WIL160-3747 .75" 10.25" 6 .325" 5.50" 6.1 lbs.
WIL160-5840 .81" 11.00" 6 .325" 6.25" 7.9 lbs. High strength steel alloy rotors have greater
WIL160-5844 .81" 12.19" 8 5/16"-24 7.62" 8.8 lbs. strength and resistance to warping and are drilled
to reduce rotating unsprung weight.
Rotor Rotor No. of Hole Bolt
Part No. Thk. Dia. Mt. Holes Type Circle Weight
WIL160-0495 .31" 12.00" 8 5/16"-24 7.62" 4.6 lbs.
WIL160-0525 .35" 12.00" 8 .325" 7.00" 5.4 lbs.

DYNAMIC MOUNT
ULD-32 DRILLED DRILLED STEEL ROTOR
STRAIGHT VANE ROTORS The most effective method of eliminating thermal
Rotor Rotor No. of Hole Bolt stress and distortion, dynamic mounted rotors are
Part No. Thk. Dia. Mt. Holes Type Circle Weight machined to accept special bolts and T-nuts, which
WIL160-5863 .81" 11.75" 8 .325" 7.00" 7.2 lbs. allows the rotor to expand and contract independently
WIL160-5864 1.25" 11.75" 8 .325" 7.00" 7.7 lbs. of the mounting hub or hat.
WIL160-5865 .81" 12.19" 8 .325" 7.00" 8.0 lbs. Rotor Rotor No of Hole Bolt
Part No. Thk. Dia. Mt. Holes Type Circle Weight
WIL160-9772* .350" 11.75" 8 .325" 7.00" 4.1 lbs.
* To mount this rotor on a 5/16"-18 threaded hat or hub, use bolt and
T-nut kit WIL230-5308.
WIL230-5567
ULS-32 SCALLOPED ROTOR BOLT KITS
STRAIGHT VANE ROTORS Bolt kits fasten rotors to hubs or hats. All bolts are lock wire drilled.
Rotor Rotor No. of Hole Bolt
Part No. Thk. Dia. Mt. Holes Type Circle Weight Part No. Description
WIL160-8135 .81" 11.75" 8 .325" 7.00" 5.4 lbs. WIL230-0150 Socket Head, Threaded Rotors, (8) 5/16"-24 x .750"
WIL160-8136 .81" 12.19" 8 .325" 7.00" 5.9 lbs. WIL230-0526 Hex Head, Wide 5/Threaded Hats, (8) 5/16"-18 x 1.00"
WIL160-8343 1.25" 11.75" 8 .325" 7.00" 5.8 lbs. (Not Lock Wire Drilled)
WIL160-8814 1.25" 11.75" 8 .325" 7.00" 6.7 lbs. WIL230-4572 Stainless Steel, GT Hats, (12) 1/4"-20 x 1.00"
WIL160-12041 1.25" 11.75" 8 .325" 7.00" 5.4 lbs. WIL230-5567 Dynamic Mount Kit, Live Axle Rotor Clamp,
WIL160-13373 .810" 11.75" 8 .325" 7.00" 5 lbs. (8) 5/16"-24 x 1.25" Bolts & Crimp Nuts
WIL230-10483 Dynamic Sprint, (8) Bolts With T-Nuts
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