Page 1 How to Choose a Racing Alternator 1833 Downs Drive West Chicago, IL 60185 (630) 957-4019 TECH DEPT (630) 849-7754 www.powermasterperformance.com Choosing the correct charging system set up is just as important as having the correct engine set up. Today, most race cars have more electrical demand than ever before. Many applications require a high amp alternator to meet the demands. The charge wire has to be larger to handle higher amps. And the pulley ratio has to be correct to keep the alternator charging at various speeds without over spinning the alternator. Follow the steps on this sheet as a guide to determine the correct set up for your race car. 1. Make a list of the electrical systems components...ignition, fans, lights, cooling fans, etc. Some components may list amp draw. (refer to manufacturer if necessary) Total the maximum amperage requirements. 2. Select the gauge charge wire needed based on the alternator total output. Accessory Headlights/tail lights Halogen bulbs Dash Lights Electric Fans On Board Radio CDI Ignition HEI Ignition Electric Water Pump Electric Fuel Pump Gauges Example Actual Amps Amps 10 10ea 2-4 10-50 4-10 6-36 6-10 12-25 7-15 2-6 Example Actual Accessory Amps Amps Brake Blowers 8-10 Driver Cooling System 10-15 Data Recorder 2-10 Line Lock 4-8 Delay Box 8-12 Trans Brake 12-20 Throttle Stop 5-15 Nitrous Solenoid(each) 5-15 Other Accessories Total Amp Draw Charge Wires Use the chart below to determine charge wire gauge. Using too small of a gauge will result in voltage drop. Wire Length 5'-10' 11'-19' 20'-28' Amps 30-70 10-8 8-6 6-4 70-100 8-6 6-4 4-2 100-150 6-4 4-2 2-0 150-200 4-2 2-0 0-1/0 Wire Size 3. Determine constant electrical load______(amps) Managed electrical load_________(amps) 4. Determine your engine idle rpm_________ Max racing rpm___________ 5. Select Pulleys ! WARNING ! Max Alt RPM 18,000 Pulley Ratios and Selecting Correct Pulley Diameter A B Alternator Pulleys p/n 181, 2.8” O.D. 182, 4.0” O.D. 183, 5.25”O.D. Once you determine the engine versus alternator speed, insure the alternator you’ve selected will perform at low engine rpm’s. Change pulley size if needed to maintain alternator minimum speed to give best output at low engine rpm’s How to Choose a Racing Alternator, Cont Page 2 TECH DEPT (630) 849-7754 6. Now that you know your amperage requirements, it’s time to choose which alternator and mounting bracket you’ll need. It’s vital to your overall performance that you have an alternator big enough to maintain adequate voltage, (no lower than 13 volts on a 12V system). Drag Race or Circle Track Alternators Amps 50/30 50/30 50/30 50/30 60/35 80/70 95/50 95/50 95/50 100/80 100/70 Volts 12 12 16 12/16 12 12 12 16 12/16 12 16 Alt P/N 8172 jumper wire 8162 Denso 8166 Denso 8168 Denso 8102 jumper wire 8003 Delco 8132 Denso 8136 Denso 8138 Denso 8002 Delco 8006 Delco Amps Volts 100/60 100/60 12 16 8062 Delco 8066 Delco 100/60 100/60 100/60 100/60 105/80 105/80 105/80 105/80 120/80 12/16 12 16 12/16 12 16 12/16 12 12 8068 Delco 8072 Delco 8076 Delco 8078 Delco 8012 Delco 8016 Delco 8018 Delco 8022 Delco 8142 Denso 120/80 120/80 160/70 160/70 Alt P/N 16 12/16 12 12/16 8146 Denso 8148 Denso 8152 Denso 8158 Denso Circle Track ONLY Requires HI RPM’s Amps 75/7 75/7 95/30 95/30 Volt 12 12/16 12 12/16 Alt P/N 8182 Denso 8188 Denso 8122 Denso 8128 Denso See Catalog or Visit Web Site for Mounting Brackets and Complete Kits CHEVY LOW MOUNT 50 AMP KIT 8-895 BBC 8-896 SBC CHEVY SNUG MOUNT 50 AMP KIT 8-875 BBC 8-880 SBC 100 AMP KIT 8-897 BBC 8-898 SBC 100 AMP KIT 8-882 BBC 8-881 SBC XS Volt Adj Reg 12-16 Volt System Add #8 to end of p/n CHEVY CIRCLE TRACK Quick Change 50 AMP KIT 8-400 Ford 9” 3rd Member 50 AMP KIT 8-410 50 AMP KIT 8-801 SBC 100 AMP KIT 8-722 SBC We want to Help You Select the Correct Set Up for Your Application Please Call Help Line (630) 849-7754 Powermaster Performance, 1833 Downs Drive, West Chicago, IL 60185 (630) 957-4019
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