Blower Drive B-1 Section Contents Drive Belts Belt Length Chart Sprockets Sprockets Sprocket Sectional Views 14mm Overdrive Chart 8mm Overdrive Chart 8mm Overdrive Chart 11mm Overdrive Chart Idler Pulleys Idler Plates Idler Plates Blower Snouts Blower Snout Sectional Views Blower Drive Hubs/Sectional Views Page B-2 B-3 B-4 B-5 B-6 B-7 B-8 B-9 B-10 B-11 B-12 B-13 B-14 B-15 B-16
B-2 Drive Belts RCD stocks the largest selection of Gates Power Grip GT2, Poly Chain GT2 Standard HTD and HTD YU II positive drive belts in the racing industry. These belts (in pitch sizes shown below) are available in a variety of widths and lengths. Standard HTD has been the leader in the new generation of high performance curvilinear synchronous belts. First developed in the early 70 s, it has been continuously improved through the years. Its neoprene and fiberglass construction have proven extremely durable for virtually all racing applications (with the exception of alcohol and fuel classes). This belt can be back-bent. Power Grip GT2 is an improvement over the HTD belt. It is a rubber belt with a fiberglass tensile member, neoprene backing and teeth, and a tough nylon facing for low friction and wear resistance. This belt has excellent flex life, high resistance to elongation and good length stability. This belt can be back-bent. 14mm GT2 PolyChain 14mm HTD PolyChain 13.9mm HTD PolyChain 11mm GT2 PolyChain 8mm GT2 PolyChain 8mm HTD Standard 5mm HTD Standard Poly Chain GT2 A second generation Poly Chain product has a patented tooth profile which substantially improves stress distribution. In addition, it incorporated the latest urethane and aramid materials technology for the tensile member, coupled with a completely new manufacturing method. These materials have very high modulus and tensile strength. This unique product has horsepower ratings up to four times that of its rubber counterpart! Its high impact strength withstands extreme shock and surge loading. The result is a product superior to anything in its class - without exception! This belt has been widely accepted in the fuel classes as giving superior performance compared to any other belt. This belt should NOT be back-bent. Poly Chain GT2 (PS Series) The newest generation Poly Chain belt developed exclusively for Top Fuel cars, but may be run in any class for those demanding superior performance. This new generation Poly Chain uses a modified core construction and materials used in the proven Poly Chain predecessor. Tests on championship race teams have shown an increase in reliability and the ability for more runs per belt, reducing overall belt replacement costs. The result is a product superior to anything in its class - without exception! This belt should NOT be back bent. 1/2 inch GT2 PowerGrip
Belt Length Chart B-3 BLOWER TO CRANKSHAFT DISTANCE BELT NUMBER AND PITCH 1400 100T 1440 180T 1543 111T 1568 112T 1595 145T 1600 200T 1610 115T 1694 121T 1705 155T 1750 125T 1778 127T 1792 224T 1890 135T 14mm 8mm 13.9mm 14mm 11mm 8mm 14mm 14mm 11mm 14mm 14mm 8mm 14mm BELT LENGHTH INCHES 55.12 56.69 60.75 61.73 62.79 62.99 63.39 66.69 67.13 68.90 70.00 70.55 74.41 17.00 76 144 97 100 17.25 74 140 95 98 17.50 73 137 93 97 17.75 71 134 92 95 18.00 69 131 90 93 99 18.25 67 128 88 91 97 18.50 65 125 86 89 95 18.75 63 121 84 87 93 19.00 62 118 82 86 92 19.25 60 115 81 84 90 19.50 58 112 79 82 110 88 19.75 56 109 77 80 108 149 86 98 20.00 54 106 75 78 105 146 84 96 20.25 53 102 73 77 103 142 83 95 20.50 51 99 71 75 101 139 81 93 20.75 96 70 73 98 136 79 91 99 21.00 93 68 71 96 133 77 89 97 21.25 90 66 69 94 130 75 87 95 99 21.50 86 64 67 91 126 73 85 111 93 97 21.75 62 66 89 123 72 84 109 92 96 22.00 60 64 87 120 70 82 107 90 94 168 22.25 59 62 84 117 68 80 104 88 92 168 22.50 57 60 82 114 66 78 102 86 90 162 22.75 55 58 80 111 64 76 100 84 88 159 23.00 53 57 78 107 63 75 98 83 87 155 23.25 51 55 75 104 61 73 95 81 85 152 23.50 53 73 101 59 71 93 79 83 149 99 23.75 51 71 98 57 69 91 77 81 146 97 24.00 68 95 55 67 88 75 79 143 95 24.25 66 92 54 66 86 74 78 140 94 24.50 64 88 52 64 84 72 76 136 92 24.75 61 50 62 81 70 74 133 90 25.00 59 60 79 68 72 130 88 25.25 58 77 66 70 127 86 25.50 56 74 64 68 124 84 25.75 55 72 63 67 120 83 26.00 53 70 61 65 117 81 26.25 51 68 59 63 114 79 26.50 65 57 61 111 77 26.75 63 55 59 108 75 27.00 61 54 57 105 74 27.25 58 52 56 101 72 27.50 50 54 98 70 27.75 52 95 68 28.00 50 92 66
B-4 Sprockets ost requirements and is able to produce special sizes hined from solid billet 6061-T6 aluminum bars or solid ultra-sound tested for imperfections prior to machining. available. RCD s aluminum sprockets are hard anodize sprockets are coated to resist corrosion. ET Sprockets ts. All blower drive sprockets come with standard 2.00 iameter circle, and 0.5 drive flange thickness. ote the tooth count. (Example: 000000-54 = 54 tooth) ble in aluminum R 0.75 style only. 14mm 14mm 151401-25 151441-26 151401-46 151441-46 RCD offers the 8mm, 11mm and 14mm GT profile cranksh flange centered in the sprocket. This greatly reduces the ten to distort out of round under high belt loading and also k bending. This is most critical on the large diameter spr blowers. GT 3.5" WIDE CENTER FLANG GT 4.3" WIDE CENTER FLANG 8mm 8mm 11mm 11mm 13.9mm 150807-67 150847-67 151107-49 151147-49 151307-3 150807-80 150847-80 151107-58 151147-58 151307-4 HTD 3.5" WIDE CENTER FLANG 8mm 8mm 11mm 11mm 150817-67 150857-67 151117-49 151157-49 150817-80 150857-80 151117-58 151157-58 3.50 8mm 54T GT ET ET ET ET 14mm 14mm 151403-25 151443-26 151403-34 151443-34 14mm 14mm 151405-25 151445-26 151405-34 151445-34 14mm 14mm 151411-26 151451-26 151411-34 151451-34 14mm 14mm 151413-26 151453-26 151413-34 151453-34 14mm 14mm 151415-26 151455-26 151415-34 151455-34 Special Orders: RCD is able to produce any size sprocket u 14 diameter in magnesium and up to 4.5 wide. Prices request. 3.50 8mm 59T GT RCD blower drive hubs, with easily changeable sprockets supercharged engine for maximum horsepower and your Drive hubs machined 3.50 from 8mm chrome-moly heat trea Drive hubs bored, keyed 50T & GT honed for an accurate Drive hubs have 1.25 register and six 1/4-28 bol Sprockets machined from billet 6061T-T6 alumin Sprockets available in 8mm GT or HTD profiles f Call for availability and stocked sizes. 4.30 14mm 27T GT m 14mm -25 151481-25 -46 151481-46 ET m 14mm -25 151483-25 -34 151483-34 DARD Drive Hubs PN: 152008-0007 Adapter Hub Vortech PN: 152008-0005 Adapter Hub Paxton PN: 152008-0003 Adapter 4.30 Hub 14mm ATI ProCharger 30T GT Sprockets HTD CENTRIFICAL GT CENTRIFICAL 8mm 8mm Aluminum Aluminum 150889-26 150890-26 150889-55 150890-55 3.50 1/2 trapezoidal 33 tooth Aluminum
Center Flange Sprockets Sprockets B-5 aft sprockets with the drive dency of the circumference eeps the drive flange from ockets used to drive screw E 14mm 14mm 6 151407-30 151447-36 6 151407-46 151447-46 E 3.50 8mm 75 tooth GT profile Aluminum E 14mm 14mm 151417-36 151457-36 151417-46 151457-46 14mm 151485-36 151485-46 4.30 14mm 42 tooth GT profile Magnesium p to 24 diameter in aluminum, and delivery are quoted upon Centrifugal Blower Drive, allows you to tune your driving conditions. ted steel. fit on the blower input shaft. ts for solid sprocket mounting. um and hard anodized for wear. rom 26 teeth to 55 teeth.
B-6 Sprocket Sectional Views 2.015.5 3.50 3.00 Aluminum Top & Bottom Sprockets.32 3.50 2.68 Top Sprockets.75 3.50 2.25 Top Sprockets 4.30 3.00 1.12 1.33.80 Top Sprockets Top Sprockets 2.68 Top Sprockets 2.47 4.30 4.30 2.015.5 Magnesium Bottom Sprockets 3.50 3.00 3.50 Bottom Sprockets 1.50 6 places even.380 2.015 Bottom Sprockets 1.391 4.30 1.50.5 2.30
14mm Overdrive Chart B-7 Percentage of Crankshaft Speed Blower Sprocket Tooth Count NOTE: Also used for 1/2 pitch 35 34 33 32 31 30 29 28 27 26 25 24 Crankshaft Sprocket Tooth Count 30 0.0 3.4 7.1 11.1 15.4 20.0 25.0 31 0.0 3.3 6.9 10.7 14.8 19.2 24.0 29.2 32 0.0 3.2 6.7 10.3 14.3 18.5 23.1 28.0 33.3 33 0.0 3.1 6.5 10.0 13.8 17.9 22.2 26.9 32.0 37.5 34 0.0 3.0 6.3 9.7 13.3 17.2 21.4 25.9 30.8 36.0 41.7 35 0.0 2.9 6.1 9.4 12.9 16.7 20.7 25.0 29.6 34.6 40.0 45.8 36 2.9 5.9 9.1 12.5 16.1 20.0 24.1 28.6 33.3 38.5 44.0 50.0 37 5.7 8.8 12.1 15.6 19.4 23.3 27.6 32.1 37.0 42.3 48.0 54.2 38 8.6 11.8 15.2 18.8 22.6 26.7 31.0 35.7 40.7 46.2 52.0 58.3 39 11.4 14.7 18.2 21.9 25.8 30.0 34.5 39.3 44.4 50.0 56.0 62.5 40 14.3 17.6 21.2 25.0 29.0 33.3 37.9 42.9 48.1 53.8 60.0 66.7 41 17.1 20.6 24.2 28.1 32.3 36.7 41.4 46.4 51.9 57.7 64.0 70.8 42 20.0 23.5 27.3 31.3 35.5 40.0 44.8 50.0 55.6 61.5 68.0 75.0 43 22.9 26.5 30.3 34.4 38.7 43.3 48.3 53.6 59.3 65.4 72.0 79.2 44 25.7 29.4 33.3 37.5 41.9 46.7 51.7 57.1 63.0 69.2 76.0 83.3 45 28.6 32.4 36.4 40.6 45.2 50.0 55.2 60.7 66.7 73.1 80.0 87.5 46 31.4 35.3 39.4 43.8 48.4 53.3 58.6 64.3 70.4 76.9 84.0 91.7 47 34.3 38.2 42.4 46.9 51.6 56.7 62.1 67.9 74.1 80.8 88.0 95.8 48 37.1 41.2 45.5 50.0 54.8 60.0 65.5 71.4 77.8 84.6 92.0 100.0 49 40.0 44.1 48.5 53.1 58.1 63.3 69.0 75.0 81.5 88.5 96.0 104.2 50 42.9 47.1 51.5 56.3 61.3 66.7 72.4 78.6 85.2 92.3 100.0 108.3 51 45.7 50.0 54.5 59.4 64.5 70.0 75.9 82.1 88.9 96.2 104.0 112.5 52 48.6 52.9 57.6 62.5 67.7 73.3 79.3 85.7 92.6 100.0 108.0 116.7 53 51.4 55.9 60.6 65.6 71.0 76.7 82.8 89.3 96.3 103.8 112.0 120.8 54 54.3 58.8 63.6 68.8 74.2 80.0 86.2 92.9 100.0 107.7 116.0 125.0 55 57.1 61.8 66.7 71.9 77.4 83.3 89.7 96.4 103.7 111.5 120.0 129.2 56 60.0 64.7 69.7 75.0 80.6 86.7 93.1 100.0 107.4 115.4 124.0 133.3 57 62.9 67.6 72.7 78.1 83.9 90.0 96.6 103.6 111.1 119.2 128.0 137.5 58 65.7 70.6 75.8 81.3 87.1 93.3 100.0 107.1 114.8 123.1 132.0 141.7 59 68.6 73.5 78.8 84.4 90.3 96.7 103.4 110.7 118.5 126.9 136.0 145.8 60 71.4 76.5 81.8 87.5 93.5 100.0 106.9 114.3 122.2 130.8 140.0 150.0
Crankshaft Sprocket Tooth Count B-8 8mm Overdrive Chart Percentage of Crankshaft Speed Blower Sprocket Tooth Count 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 54 0.0 1.9 3.8 5.9 8.0 10.2 12.5 14.9 17.4 20.0 22.7 25.6 28.6 55 0.0 1.9 3.8 5.8 7.8 10.0 12.2 14.6 17.0 19.6 22.2 25.0 27.9 31.0 56 0.0 1.8 3.7 5.7 7.7 9.8 12.0 14.3 16.7 19.1 21.7 24.4 27.3 30.2 33.3 57 0.0 1.8 3.6 5.6 7.5 9.6 11.8 14.0 16.3 18.8 21.3 23.9 26.7 29.5 32.6 35.7 58 0.0 1.8 3.6 5.5 7.4 9.4 11.5 13.7 16.0 18.4 20.8 23.4 26.1 28.9 31.8 34.9 38.1 59 0.0 1.7 3.5 5.4 7.3 9.3 11.3 13.5 15.7 18.0 20.4 22.9 25.5 28.3 31.1 34.1 37.2 40.5 60 0.0 1.7 3.4 5.3 7.1 9.1 11.1 13.2 15.4 17.6 20.0 22.4 25.0 27.7 30.4 33.3 36.4 39.5 42.9 61 1.7 3.4 5.2 7.0 8.9 10.9 13.0 15.1 17.3 19.6 22.0 24.5 27.1 29.8 32.6 35.6 38.6 41.9 45.2 62 3.3 5.1 6.9 8.8 10.7 12.7 14.8 17.0 19.2 21.6 24.0 26.5 29.2 31.9 34.8 37.8 40.9 44.2 47.6 63 5.0 6.8 8.6 10.5 12.5 14.5 16.7 18.9 21.2 23.5 26.0 28.6 31.3 34.0 37.0 40.0 43.2 46.5 50.0 64 6.7 8.5 10.3 12.3 14.3 16.4 18.5 20.8 23.1 25.5 28.0 30.6 33.3 36.2 39.1 42.2 45.5 48.8 52.4 65 8.3 10.2 12.1 14.0 16.1 18.2 20.4 22.6 25.0 27.5 30.0 32.7 35.4 38.3 41.3 44.4 47.7 51.2 54.8 66 10.0 11.9 13.8 15.8 17.9 20.0 22.2 24.5 26.9 29.4 32.0 34.7 37.5 40.4 43.5 46.7 50.0 53.5 57.1 67 11.7 13.6 15.5 17.5 19.6 21.8 24.1 26.4 28.8 31.4 34.0 36.7 39.6 42.6 45.7 48.9 52.3 55.8 59.5 68 13.3 15.3 17.2 19.3 21.4 23.6 25.9 28.3 30.8 33.3 36.0 38.8 41.7 44.7 47.8 51.1 54.5 58.1 61.9 69 15.0 17.0 19.0 21.1 23.2 25.5 27.8 30.2 32.7 35.3 38.0 40.8 43.8 46.8 50.0 53.3 56.8 60.5 64.3 70 16.7 18.6 20.7 22.8 25.0 27.3 29.6 32.1 34.6 37.3 40.0 42.9 45.8 48.9 52.2 55.6 59.1 62.8 66.7 71 18.3 20.3 22.4 24.6 26.8 29.1 31.5 34.0 36.5 39.2 42.0 44.9 47.9 51.1 54.3 57.8 61.4 65.1 69.0 72 20.0 22.0 24.1 26.3 28.6 30.9 33.3 35.9 38.5 41.2 44.0 46.9 50.0 53.2 56.5 60.0 63.6 67.4 71.4 73 21.7 23.7 25.9 28.1 30.4 32.7 35.2 37.7 40.4 43.1 46.0 49.0 52.1 55.3 58.7 62.2 65.9 69.8 73.8 74 23.3 25.4 27.6 29.8 32.1 34.5 37.0 39.6 42.3 45.1 48.0 51.0 54.2 57.4 60.9 64.4 68.2 72.1 76.2 75 25.0 27.1 29.3 31.6 33.9 36.4 38.9 41.5 44.2 47.1 50.0 53.1 56.3 59.6 63.0 66.7 70.5 74.4 78.6 76 26.7 28.8 31.0 33.3 35.7 38.2 40.7 43.4 46.2 49.0 52.0 55.1 58.3 61.7 65.2 68.9 72.7 76.7 81.0 77 28.3 30.5 32.8 35.1 37.5 40.0 42.6 45.3 48.1 51.0 54.0 57.1 60.4 63.8 67.4 71.1 75.0 79.1 83.3 78 30.0 32.2 34.5 36.8 39.3 41.8 44.4 47.2 50.0 52.9 56.0 59.2 62.5 66.0 69.6 73.3 77.3 81.4 85.7 79 31.7 33.9 36.2 38.6 41.1 43.6 46.3 49.1 51.9 54.9 58.0 61.2 64.6 68.1 71.7 75.6 79.5 83.7 88.1 80 33.3 35.6 37.9 40.4 42.9 45.5 48.1 50.9 53.8 56.9 60.0 63.3 66.7 70.2 73.9 77.8 81.8 86.0 90.5 81 35.0 37.3 39.7 42.1 44.6 47.3 50.0 52.8 55.8 58.8 62.0 65.3 68.8 72.3 76.1 80.0 84.1 88.4 92.9 82 36.7 39.0 41.4 43.9 46.4 49.1 51.9 54.7 57.7 60.8 64.0 67.3 70.8 74.5 78.3 82.2 86.4 90.7 95.2 83 38.3 40.7 43.1 45.6 48.2 50.9 53.7 56.6 59.6 62.7 66.0 69.4 72.9 76.6 80.4 84.4 88.6 93.0 97.6 84 40.0 42.4 44.8 47.4 50.0 52.7 55.6 58.5 61.5 64.7 68.0 71.4 75.0 78.7 82.6 86.7 90.9 95.3 100.0 85 41.7 44.1 46.6 49.1 51.8 54.5 57.4 60.4 63.5 66.7 70.0 73.5 77.1 80.9 84.8 88.9 93.2 97.7 102.4 86 43.3 45.8 48.3 50.9 53.6 56.4 59.3 62.3 65.4 68.6 72.0 75.5 79.2 83.0 87.0 91.1 95.5 100.0 104.8
Crankshaft Sprocket Tooth Count 8mm Overdrive Chart B-9 Percentage of Crankshaft Speed Blower Sprocket Tooth Count 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 54 31.7 35.0 38.5 42.1 45.9 50.0 54.3 58.8 63.6 68.8 74.2 80.0 86.2 92.9 100.0 107.7 116.0 125.0 134.8 55 34.1 37.5 41.0 44.7 48.6 52.8 57.1 61.8 66.7 71.9 77.4 83.3 89.7 96.4 103.7 111.5 120.0 129.2 139.1 56 36.6 40.0 43.6 47.4 51.4 55.6 60.0 64.7 69.7 75.0 80.6 86.7 93.1 100.0 107.4 115.4 124.0 133.3 143.5 57 39.0 42.5 46.2 50.0 54.1 58.3 62.9 67.6 72.7 78.1 83.9 90.0 96.6 103.6 111.1 119.2 128.0 137.5 147.8 58 41.5 45.0 48.7 52.6 56.8 61.1 65.7 70.6 75.8 81.3 87.1 93.3 100.0 107.1 114.8 123.1 132.0 141.7 152.2 59 43.9 47.5 51.3 55.3 59.5 63.9 68.6 73.5 78.8 84.4 90.3 96.7 103.4 110.7 118.5 126.9 136.0 145.8 156.5 60 46.3 50.0 53.8 57.9 62.2 66.7 71.4 76.5 81.8 87.5 93.5 100.0 106.9 114.3 122.2 130.8 140.0 150.0 160.9 61 48.8 52.5 56.4 60.5 64.9 69.4 74.3 79.4 84.8 90.6 96.8 103.3 110.3 117.9 125.9 134.6 144.0 154.2 165.2 62 51.2 55.0 59.0 63.2 67.6 72.2 77.1 82.4 87.9 93.8 100.0 106.7 113.8 121.4 129.6 138.5 148.0 158.3 169.6 63 53.7 57.5 61.5 65.8 70.3 75.0 80.0 85.3 90.9 96.9 103.2 110.0 117.2 125.0 133.3 142.3 152.0 162.5 173.9 64 56.1 60.0 64.1 68.4 73.0 77.8 82.9 88.2 93.9 100.0 106.5 113.3 120.7 128.6 137.0 146.2 156.0 166.7 178.3 65 58.5 62.5 66.7 71.1 75.7 80.6 85.7 91.2 97.0 103.1 109.7 116.7 124.1 132.1 140.7 150.0 160.0 170.8 182.6 66 61.0 65.0 69.2 73.7 78.4 83.3 88.6 94.1 100.0 106.3 112.9 120.0 127.6 135.7 144.4 153.8 164.0 175.0 187.0 67 63.4 67.5 71.8 76.3 81.1 86.1 91.4 97.1 103.0 109.4 116.1 123.3 131.0 139.3 148.1 157.7 168.0 179.2 191.3 68 65.9 70.0 74.4 78.9 83.8 88.9 94.3 100.0 106.1 112.5 119.4 126.7 134.5 142.9 151.9 161.5 172.0 183.3 195.7 69 68.3 72.5 76.9 81.6 86.5 91.7 97.1 102.9 109.1 115.6 122.6 130.0 137.9 146.4 155.6 165.4 176.0 187.5 200.0 70 70.7 75.0 79.5 84.2 89.2 94.4 100.0 105.9 112.1 118.8 125.8 133.3 141.4 150.0 159.3 169.2 180.0 191.7 204.3 71 73.2 77.5 82.1 86.8 91.9 97.2 102.9 108.8 115.2 121.9 129.0 136.7 144.8 153.6 163.0 173.1 184.0 195.8 208.7 72 75.6 80.0 84.6 89.5 94.6 100.0 105.7 111.8 118.2 125.0 132.3 140.0 148.3 157.1 166.7 176.9 188.0 200.0 213.0 73 78.0 82.5 87.2 92.1 97.3 102.8 108.6 114.7 121.2 128.1 135.5 143.3 151.7 160.7 170.4 180.8 192.0 204.2 217.4 74 80.5 85.0 89.7 94.7 100.0 105.6 111.4 117.6 124.2 131.3 138.7 146.7 155.2 164.3 174.1 184.6 196.0 208.3 221.7 75 82.9 87.5 92.3 97.4 102.7 108.3 114.3 120.6 127.3 134.4 141.9 150.0 158.6 167.9 177.8 188.5 200.0 212.5 226.1 76 85.4 90.0 94.9 100.0 105.4 111.1 117.1 123.5 130.3 137.5 145.2 153.3 162.1 171.4 181.5 192.3 204.0 216.7 230.4 77 87.8 92.5 97.4 102.6 108.1 113.9 120.0 126.5 133.3 140.6 148.4 156.7 165.5 175.0 185.2 196.2 208.0 220.8 234.8 78 90.2 95.0 100.0 105.3 110.8 116.7 122.9 129.4 136.4 143.8 151.6 160.0 169.0 178.6 188.9 200.0 212.0 225.0 239.1 79 92.7 97.5 102.6 107.9 113.5 119.4 125.7 132.4 139.4 146.9 154.8 163.3 172.4 182.1 192.6 203.8 216.0 229.2 243.5 80 95.1 100.0 105.1 110.5 116.2 122.2 128.6 135.3 142.4 150.0 158.1 166.7 175.9 185.7 196.3 207.7 220.0 233.3 247.8 81 97.6 102.5 107.7 113.2 118.9 125.0 131.4 138.2 145.5 153.1 161.3 170.0 179.3 189.3 200.0 211.5 224.0 237.5 252.2 82 100.0 105.0 110.3 115.8 121.6 127.8 134.3 141.2 148.5 156.3 164.5 173.3 182.8 192.9 203.7 215.4 228.0 241.7 256.5 83 102.4 107.5 112.8 118.4 124.3 130.6 137.1 144.1 151.5 159.4 167.7 176.7 186.2 196.4 207.4 219.2 232.0 245.8 260.9 84 104.9 110.0 115.4 121.1 127.0 133.3 140.0 147.1 154.5 162.5 171.0 180.0 189.7 200.0 211.1 223.1 236.0 250.0 265.2 85 107.3 112.5 117.9 123.7 129.7 136.1 142.9 150.0 157.6 165.6 174.2 183.3 193.1 203.6 214.8 226.9 240.0 254.2 269.6 86 109.8 115.0 120.5 126.3 132.4 138.9 145.7 152.9 160.6 168.8 177.4 186.7 196.6 207.1 218.5 230.8 244.0 258.3 273.9
Crankshaft Sprocket Tooth Count B-10 11mm Overdrive Chart Percentage of Crankshaft Speed Blower Sprocket Tooth Count 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 49 14.0 16.7 19.5 22.5 25.6 28.9 32.4 36.1 40.0 44.1 48.5 53.1 58.1 63.3 69.0 75.0 81.5 88.5 96.0 50 16.3 19.0 22.0 25.0 28.2 31.6 35.1 38.9 42.9 47.1 51.5 56.3 61.3 66.7 72.4 78.6 85.2 92.3 100.0 51 18.6 21.4 24.4 27.5 30.8 34.2 37.8 41.7 45.7 50.0 54.5 59.4 64.5 70.0 75.9 82.1 88.9 96.2 104.0 52 20.9 23.8 26.8 30.0 33.3 36.8 40.5 44.4 48.6 52.9 57.6 62.5 67.7 73.3 79.3 85.7 92.6 100.0 108.0 53 23.3 26.2 29.3 32.5 35.9 39.5 43.2 47.2 51.4 55.9 60.6 65.6 71.0 76.7 82.8 89.3 96.3 103.8 112.0 54 25.6 28.6 31.7 35.0 38.5 42.1 45.9 50.0 54.3 58.8 63.6 68.8 74.2 80.0 86.2 92.9 100.0 107.7 116.0 55 27.9 31.0 34.1 37.5 41.0 44.7 48.6 52.8 57.1 61.8 66.7 71.9 77.4 83.3 89.7 96.4 103.7 111.5 120.0 56 30.2 33.3 36.6 40.0 43.6 47.4 51.4 55.6 60.0 64.7 69.7 75.0 80.6 86.7 93.1 100.0 107.4 115.4 124.0 57 32.6 35.7 39.0 42.5 46.2 50.0 54.1 58.3 62.9 67.6 72.7 78.1 83.9 90.0 96.6 103.6 111.1 119.2 128.0 58 34.9 38.1 41.5 45.0 48.7 52.6 56.8 61.1 65.7 70.6 75.8 81.3 87.1 93.3 100.0 107.1 114.8 123.1 132.0 59 37.2 40.5 43.9 47.5 51.3 55.3 59.5 63.9 68.6 73.5 78.8 84.4 90.3 96.7 103.4 110.7 118.5 126.9 136.0 60 39.5 42.9 46.3 50.0 53.8 57.9 62.2 66.7 71.4 76.5 81.8 87.5 93.5 100.0 106.9 114.3 122.2 130.8 140.0 61 41.9 45.2 48.8 52.5 56.4 60.5 64.9 69.4 74.3 79.4 84.8 90.6 96.8 103.3 110.3 117.9 125.9 134.6 144.0 62 44.2 47.6 51.2 55.0 59.0 63.2 67.6 72.2 77.1 82.4 87.9 93.8 100.0 106.7 113.8 121.4 129.6 138.5 148.0 63 46.5 50.0 53.7 57.5 61.5 65.8 70.3 75.0 80.0 85.3 90.9 96.9 103.2 110.0 117.2 125.0 133.3 142.3 152.0 64 48.8 52.4 56.1 60.0 64.1 68.4 73.0 77.8 82.9 88.2 93.9 100.0 106.5 113.3 120.7 128.6 137.0 146.2 156.0 65 51.2 54.8 58.5 62.5 66.7 71.1 75.7 80.6 85.7 91.2 97.0 103.1 109.7 116.7 124.1 132.1 140.7 150.0 160.0 66 53.5 57.1 61.0 65.0 69.2 73.7 78.4 83.3 88.6 94.1 100.0 106.3 112.9 120.0 127.6 135.7 144.4 153.8 164.0 67 55.8 59.5 63.4 67.5 71.8 76.3 81.1 86.1 91.4 97.1 103.0 109.4 116.1 123.3 131.0 139.3 148.1 157.7 168.0 68 58.1 61.9 65.9 70.0 74.4 78.9 83.8 88.9 94.3 100.0 106.1 112.5 119.4 126.7 134.5 142.9 151.9 161.5 172.0 69 60.5 64.3 68.3 72.5 76.9 81.6 86.5 91.7 97.1 102.9 109.1 115.6 122.6 130.0 137.9 146.4 155.6 165.4 176.0 70 62.8 66.7 70.7 75.0 79.5 84.2 89.2 94.4 100.0 105.9 112.1 118.8 125.8 133.3 141.4 150.0 159.3 169.2 180.0 71 65.1 69.0 73.2 77.5 82.1 86.8 91.9 97.2 102.9 108.8 115.2 121.9 129.0 136.7 144.8 153.6 163.0 173.1 184.0 72 67.4 71.4 75.6 80.0 84.6 89.5 94.6 100.0 105.7 111.8 118.2 125.0 132.3 140.0 148.3 157.1 166.7 176.9 188.0 73 69.8 73.8 78.0 82.5 87.2 92.1 97.3 102.8 108.6 114.7 121.2 128.1 135.5 143.3 151.7 160.7 170.4 180.8 192.0
Idler Pulleys B-11 Drawing 1 Drawing 2 Drawing 3 PULLEY DIM "A" SPINDLE DIM "B" DIM "C" PULLEY DIM "A" SPINDLE DIM "B" DIM "C" DRAWING 1 DRAWING 3 156014-0022 2.175" 156019-0002 0.15" 1.250" 156024-0015 3.10" 156019-0060 0.24" 0.470" 156019-0004 0.53" 1.625" 156024-0022 156019-0062 0.43" 0.655" 156019-0006 0.90" 2.000" 156024-0017 3.40" 156019-0060 0.24" 0.470" 156014-0027 2.65" 156019-0002 0.15" 1.250" *156024-0018 156019-0062 0.43" 0.655" 156019-0004 0.53" 1.625" 156024-0024 156019-0006 0.90" 2.000" *156024-0025 156014-0031 3.05" 156019-0002 0.15" 1.250" 156024-0030 156019-0004 0.53" 1.625" *156024-0031 156019-0006 0.90" 2.000" 156024-0019 4.20" 156019-0060 0.24" 0.470" 156014-0035 3.45" 156019-0002 0.15" 1.250" *156024-0020 156019-0062 0.43" 0.655" 156019-0004 0.53" 1.625" 156024-0026 DRAWING 2 *156024-0027 156009-0015 2.05 156019-0012 0.10" 1.050" *MAGNESIUM 156019-0014 0.50" 1.450" 156019-0016 0.80" 1.850" 156009-0027 2.65 156019-0012 0.10" 1.050" *156009-0028 156019-0014 0.50" 1.450" 156019-0016 0.80" 1.850" 156009-0031 3.05" 156019-0012 0.15" 1.050" *156009-0032 156019-0014 0.53" 1.450" 156019-0016 0.90" 1.850"
B-12 Idler Plates Big Block Chevy Idler Plate Fits all Big Block Chevy, KB, KB Olds, Rodeck and 481X. It is machined from 3/4 thick aluminum or magnesium plate. It has a 7 long slot which provides for adequate adjustment. The assembly includes: studs, spacers, nuts, washers and 1/4 thick water block-off plates. Option: Ported 1 water block-off plates are available. PN: 156206-0018 Big Block Chevy Idler plate with Outboard Support This idler bracket assembly provides the most stable mounting platform for the idler pulley. The back plate is 3/4 thick. The outboard support is 1/2 thick. Accepts either smooth or toothed idler pulleys. Includes 1/4 water block-off plates. All parts machined from 2024-T3 aluminum bar and plate. PN: 156200-0010 w/3.2 Idler Spacing PN: 156200-0012 w/4.4 Idler Spacing Small Block Chevy Idler Plate For all small block Chevys and derivatives such as Rodeck or Donovan. Machined from 3/4 thick aluminum plate for rigidity in full competition applications. The kit includes: studs, spacers, nuts, washers and 1/4 thick water block-off plates. PN: 156206-0006 NOTE: Additional Chevy water block options on page E-8 Ford Idler Plate with Outboard Support This idler bracket assembly provides the most stable mounting platform for the idler pulley. The back plate is 3/4 thick. The outboard support is 1/2 thick. Accepts either smooth or toothed idler pulleys. All parts machined from 2024-T3 aluminum bar and plate. Note: This bracket does not block off the water holes. PN: 156200-0020 w/3.2 Idler Spacing PN: 156200-0022 w/4.4 Idler Spacing
Idler Plates B-13 426 Chrysler angled idler bracket Complete with top brace and dual magneto support. This idler bracket allows the maximum amount of idler pulley adjustment. The adjusting slot starts at the top in the center and moves out and down at a 45 angle to clear under a dual magneto drive. Top brace provides additional outboard support for the idler pulley keeping it parallel with the blower drive sprockets. The additional friction surface also helps prevent slipping. Dual magneto supports are for I.C.E., Enderle, and S.A.E. standard or tall cam location. Brackets and idlers are available in either aluminum or magnesium. The 3/4 diameter idler stud nut, and side stools for toothed idler, are available in titanium. Includes all bolts, nuts, studs and spacers. PN: Multiple configurations are available - Please call to configure your application and for pricing NOTE: Additional photos and options on pages E-2 and E-3 426 Idler Plate This is the most popular idler plate for the 440 or the 426 Chryslers with only one magneto. It can be used with a dual magneto drive but the idler pulley travel is limited by interference with the magneto drive. This 3/4 thick idler plate provides a stable platform for the idler pulley. Assembly includes studs, spacers, nuts and washers. PN: 156206-0003 Short Slot PN: 256206-0004 Long Slot 392 Chrysler or 417 Donovan This 3/4 thick idler plate provides a stable mounting platform for the idler pulley. Spools, studs, nuts and washers for mounting idler plate available. All parts machined from 2024-T3 aluminum bar and plate. Magnesium plate machined from AZ31B-H24 plate. Studs are heat treated chrome-moly steel. Nuts are aircraft quality. PN: 156206-0060 Idler Plate w/long Slot PN: 156206-0062 Idler Plate w/short Slot Magnesium
B-14 Blower Snouts RCD s blower snouts are available in aluminum magnesium coated to resist corrosion. All snout assemblies are complete with shaft, bearings, seal, lock rings, fasteners and O ring. Features: Face O ring seal between housing and blower front cover. Magnesium housings have flanged aluminum bushings around bolt holes. Snout housings are machined from solid billet magnesium or aluminum. Drive shafts are gun drilled and interior dimension profiled for maximum weight reduction. Standard blower drive shaft is machined from heat treated chrome-moly steel with 1.312 major diameter 24 tooth involute spline for best strength and precision slip fit. Sprocket fasteners are Grade 8 socket head bolts or 12 point bolts, with correct grip length for top sprocket and starter jaw. Select snouts have 12 mount holes and 2 bearings in the snout to help carry the bending load the blower drive belt puts on the front of the blower and the rotors. P/N: 157000-0004 Blower Snout 3.125 P/N: 157000-0008 Blower Snout 3.875 P/N: 157000-00012 Blower Snout 5.125 P/N: 157000-00016 Blower Snout 5.125 Double Bearing P/N: 157000-00017 Blower Snout 5.125 Double Bearing w/teflon Seals P/N: 157000-00018 Blower Snout 5.125 Double Bearing Magnesium P/N: 157000-00021 Blower Snout 8.000 Double Bearing w/viton Seals P/N: 157000-00022 Blower Snout 8.000 Double Bearing w/teflon Seals P/N: 157000-00025 Blower Snout 12.00 Double Bearing P/N: 157000-00026 Blower Snout 12.00 Double Bearing Magnesium NOTE: Specify Standard Blower or Retro Hi-Helix when ordering snout. Option: 300M blower drive shaft is machined from heat treated E4340 modified steel with an incredible 280,000 psi tensile strength. Blower Snout Spacer with Center Support Bearing This spacer allows the blower to be moved back 1.50 while retaining the blower sprocket in the same location. The spacer is machined from billet aluminum and is complete with bearing, correct length bolts and two O ring seals. A longer drive hub is required. PN: 157000-0090 NOTE: 1.5 longer coupler must be used. NOTE: If a blower mount starter is used, the stands must be extended.
Blower Snout Sections B-15
B-16 Blower Hubs Sectional View SSI Blower Drive Hubs Machined from heat treated chrome-moly steel billet. RCD blower drive hubs have six 7/16 weight reduction holes and six 5/16 or 3/8 attachment holes that have the correct chamfer and spot face for our NAS 12 point bolts. The finish is black oxide. SSI SSI PN: 157002-18 1.5 Bore 3.865 Long PN: 157002-20 1.5 Bore 5.10 Long PN: 157002-25 1.5 Bore 5.60 Long Roots Roots Roots Roots PN: 157002-09 1.60 Long PN: 157002-10 2.35 Long PN: 157002-11 3.60 Long PN: 157002-12 4.25 Long SSI (No Bolt) SSI (No Bolt) PN: 157002-03 2.06 Long PN: 157002-05 2.56 Long PN: 157002-07 3.80 Long SSI (No Bolt)