HOT ROD CALC™ — 1
Designing and building the Hot Rod Calc™ could not have been done without the support and input from individuals knowledgeable in all aspects of motorsports racing, especially those with deep understanding of the relationship between weather conditions and engine performance. Calculated Industries gratefully acknowledges Patrick Hale (Drag Racing Pro) and Marko Glush (independent engine builder and bracket racer) for their generous time and expertise during the development of this calculator.
HOT ROD CALC™ The Hot Rod Calc™ Road and Strip Performance Calculator is specifically designed for today’s hot rod owner/builders, drag and bracket racers, engine builders, and car and truck enthusiasts. Whether you’re into hot rods, street performance, off-road, or drag racing, the Hot Rod Calc can help with its built-in solutions for carburetor size, volumetric efficiency, tire ratios, gear ratios, engine displacement, compression ratio, HP, torque, and RPM.
TABLE OF CONTENTS GETTING STARTED ......................................................................4 KEY DEFINITIONS .........................................................................4 Basic Function Keys .....................................................................4 Dimensional Function Keys ..........................................................5 Miscellaneous Function Keys .......................................................6 ET Prediction Keys ..................................
ET Prediction and HPc ...............................................................27 ET Prediction and Wind Conditions ............................................30 Estimating Vehicle Weight ..........................................................32 Estimating Rear Wheel Horsepower .........................................33 Calculating Effects of Changing Tire Sizes ................................35 Speed, RPM, Gear Ratios, and Tire Relationships ....................37 Calculating Carburetor Size ..
GETTING STARTED You may want to practice getting a feel for your calculator keys by reading through the key definitions and learning how to enter data, how to store values, etc., before proceeding to the examples. KEY DEFINITIONS Basic Function Keys On/Clear Key – Turns on power. Pressing once clears the last entry and the display. Pressing twice clears all non-permanent values. Off – Turns all power off. Clears all non-permanent values. Arithmetic operation keys.
Dimensional Function Keys Millimeters – Identifies entry as millimeters, with repeated presses toggling between linear, area and volume units. Converts dimensional value to units of millimeters, with repeated presses toggling between millimeters and meters. Meters – Identifies entry as meters, with repeated presses toggling between linear, area and volume units. Converts dimensional value to units of millimeters, with repeated presses toggling between millimeters and meters.
Identifies/Converts to liters (liters). Identifies/Converts to milliliters (mL). Identifies/Converts to pound-force foot (lb-ft). Identifies/Converts to cubic centimeters (cc). Identifies/Converts to Newton-meters (N-m). Identifies/Converts to kilograms (kg). Miscellaneous Function Keys Calculates the square root of the number in the display. (1/x) Reciprocal – Finds the reciprocal of a number (e.g., 8 0.125). Clear All – Returns all stored values to the default settings.
calculates current local water vapor pressure, saturation water vapor pressure, and dew point temperature. Default value is 0% RH. Wind Speed – Enters current local wind speed; calculates corrected ET and speed. Elevation / Air Density Index – Enters current local elevation; calculates air density index and density altitude. Default elevation is 0 feet. Default air density index is 100%. Default density altitude is -0.001 feet (effectively 0 feet).
Drag Coefficient – Enters the vehicle’s drag coefficient when correcting for wind. See Appendix A for typical body styles and associated drag coefficient values. Default value is 35%. Performance Keys Tire Ratio – Calculates tire ratio, effective drive ratio, equivalent drive ratio, drive ratio, actual speed, and indicated (gauge) speed. Old Tire Diameter – Enters the current tire size for solving tire and gear ratio problems.
Piston Speed – Enter or calculate an engine’s Piston Speed. Calculate Piston Speed given values for RPM and Stroke length. Mechanical Efficiency – Enters the engine’s mechanical efficiency, a numeric value representing a percentage of the power available inside the engine’s cylinders that makes its way to the flywheel (e.g. less friction losses from rings, pistons, bearing friction, oil pumps, etc.). Default value is 85%. Enter or calculate a Carburetor size as a flow rate.
Deck Height – Enter and store cylinder Deck Height. Used in calculating Compression Ratio. Torque – Enter or calculate flywheel engine torque in lb-ft. Calculates Torque given RPM and Horsepower. Dome Volume – Enter and store Piston Dome Volume. Used in calculating Compression Ratio.
PREFERENCE SETTINGS Press , then to access the Preferences menu. Continue pressing to toggle through different Preferences. Press or keys to toggle between options of the different Preferences. Press to exit Preferences. Your calculator will keep Preference settings until a Full Reset alters your settings to the default values.
ENTERING DIMENSIONS Distance/Length Dimensions Examples of how linear dimensions are entered (press after each entry): DIMENSIONS 4.
ENTERING CONVERSIONS Distance/Length Conversions Enter and convert 1,320 feet to meters. KEYSTROKES DISPLAY * 0. 1320 F 402.336 M * Repeated presses of will toggle between meters and millimeters. Enter and convert 4.5 inches to millimeters. KEYSTROKES DISPLAY 0. 4.5 IN 114.3 MM * Repeated presses of will toggle between meters and millimeters. Speed Conversions Enter and convert 65 miles per hour to kilometers per hour. KEYSTROKES DISPLAY 0.
Engine Displacement Conversions Enter and convert 450 cubic inches (CID) to liters. KEYSTROKES DISPLAY 0. 450 CU IN LITER 7.3741788 Enter and convert 5.0 liters to CID. KEYSTROKES DISPLAY 0. LITER 5 305.11872 CU IN Torque Conversions Enter and convert 42 lb-ft to Newton-meters. KEYSTROKES DISPLAY 0. LB-FT 42 N-M 56.944354 Enter and convert 25 N-m to lb-ft KEYSTROKES DISPLAY N-M 25 14 — HOT ROD CALC™ 0. LB-FT 18.
Weight Conversions Enter and convert 2700 pounds to kilograms. KEYSTROKES DISPLAY 0. LBS 2700 KG 1224.6994 Volume Conversions Enter and convert 5.5 gallons to liters. KEYSTROKES DISPLAY 0. GAL 5.5 LITER 20.819765 Enter and convert 15.25 liters to gallons. KEYSTROKES DISPLAY 0. LITER 15.25 GAL 4.
USING THE HOT ROD CALC Note: The Hot Rod Calc’s built-in horsepower correction calculations are based on formulas designed for naturally aspirated gasoline burning engines. The Hot Rod Calc helps you get the most out of your bracket racing efforts by assisting you at the dragstrip in two very critical ways: • Calculates the air density index, based on your current local measured weather inputs, to assist you with changing your carburetor jet settings.
slower it will go. More specifically, engine performance is impacted by the ambient air’s density. MSA includes three parameters: absolute pressure (29.92 in Hg), temperature (60° F), and relative humidity (0% RH, or “dry air”). HPc* The Horsepower Correction Factor is calculated and implemented within HP, ET, and MPH estimations on the Hot Rod Calc. The current local weather conditions and/or elevation entered into the calculator are used to calculate HPc. As a guideline, the closer the HPc is to 1.
current, local measured weather conditions entered into the calculator. Once you have established an air/fuel ratio for the current track and weather conditions, calculate and record the current ADI. As a rule, ADI will be less than 100% for elevations above sea level as well as for temperatures above 60° F. Conversely, ADI will be more than 100% for temperatures below 60° F. As a guideline, ADI can be used to tune your engine’s air/fuel requirements when conditions change from your baseline conditions.
Pressure There are two types of commonly referenced pressure, Absolute Pressure and Corrected Pressure. Absolute Pressure is the actual, ambient local pressure. There are several tools available to help you measure Absolute Pressure, such as altimeters, absolute barometers, and motorsports weather stations. You do not need to know your track’s elevation when utilizing Absolute Pressure on your calculator.
Calculating ADI and Density Altitude Using Absolute Pressure For this example, you are at the Los Angeles County Fairplex Auto Club Raceway in Pomona, Calif. The track’s elevation is about 1,025 feet above sea-level. The current local measured weather conditions are 63.2° F, absolute pressure of 28.83 in Hg, and 58% relative humidity at 9 a.m. Note that when you have the current, measured absolute pressure, you do not need to enter the track elevation.
conditions are an unseasonably chilly 33° F, absolute pressure of 28.77 in Hg, and a relative humidity of 64% at 8:30 a.m. Calculate the Air Density Index (ADI) and Density Altitude for this example. KEYSTROKES DISPLAY 0. 1. Enter current local measured weather conditions: (Absolute Pressure) (Moisture/Relative Humidity) TEMP S 33. °F P-ABS S 28.77 INHG RH% S 64. % 2. Calculate ADI and density altitude: ELEV S 0. ADI 101.002 % D-ALT - 341.
Calculate the Air Density Index (ADI) and Density Altitude for this example. First, clear the memory on your calculator, including temporary and semi-permanent entries. KEYSTROKES DISPLAY ALL CLEArEd 1. Enter track elevation: ELEV S 3963. F 2. Enter current local measured weather conditions: TEMP S 51. °F RH% S 5. % 3. Calculate ADI and Density Altitude: ELEV S 3963. F ADI 87.969 % D-ALT 4323.
For this example, the current local measured weather conditions are 80° F, absolute pressure of 29.15 in Hg, and 53.5% relative humidity. Your race car ran best, under these baseline conditions, with #78 jets. Calculate the Air Density Index (ADI). First, clear the memory on your calculator, including temporary and semi-permanent entries. KEYSTROKES DISPLAY ALL CLEArEd 1. Enter current local measured weather conditions: TEMP S 80. °F (Absolute Pressure) P-ABS S 29.
KEYSTROKES DISPLAY 0. 3. Enter current weather conditions: TEMP S 60. °F (Absolute Pressure) P-ABS S 24.72 INHG RH% S 39 % (Moisture/Relative Humidity) 4. Calculate ADI: ELEV S 0. ADI 81.94 % D-ALT 6662.18 F Record the calculated ADI of 81.94% and density altitude of 6,662 feet in your log. 5. Calculate a fuel correction index, which is simply the current ADI of 81.94, divided by the baseline ADI of 92.038, then multiply by 100: 89.
To translate a fuel correction index to a new jet number, recall your baseline was recorded with #78 jets, which according to the Appendix B – Holley Jet Chart and Jet Orifice Area Conversion Chart, have a flow of 645 cubic-centimeters per minute. Recall your fuel correction index is about 89%. 6. Calculate a new flow requirement: 574.
2. Calculate water vapor content by subsequent presses of : (Water Vapor Pressure) (Saturation Water Vapor Pressure) (Dew Point) P-WV 0.115 INHG P-SAT 0.819 INHG DEW 21.071 °F Dew Point is a helpful temperature to know as it tells you approximately at what temperature you can expect to see moisture on the track surface.
1. Enter vehicle weight (including driver): LBS S 3840 2. Enter vehicle’s estimated rear wheel HP: HP S MSA 411. 3. Calculate ET and MPH prediction: 1/4ET 12.269 S 1/4 111.101 MPH 1/8ET 7.864 S 1/8 88.316 MPH HPc 1. P-ABS MSA 29.92 INHG TEMP MSA 60. °F RH% S 0. % ELEV S 0. Repeated presses of will toggle back through the inputs and outputs, starting with the vehicle weight input.
(HPc) and output for current weather conditions as well as MSA conditions. For this example, the track’s elevation is 3,963 feet above sealevel. Recall that our race car weighs in at about 3,840 pounds, including the driver, and produces about 411 HP in ideal or MSA conditions. The current local measured weather conditions are 73° F, absolute pressure of 25.88 in Hg, and 14% relative humidity. KEYSTROKES DISPLAY 1.
Notice within the ET output sequence, the ET predictions are displayed in 1/4 and 1/8 prediction sets based on current track conditions as well as a HPc of 1.202. Each set displays the horsepower corrected predictions (HPc) followed by the MSA adjusted predictions. Repeated presses of will toggle back through the inputs and outputs, starting with vehicle weight. Display the entered MSA HP, corrected HP, and the calculated Horsepower Correction Factor (HPc): KEYSTROKES DISPLAY HP S MSA 411.
HPc 1.211 Notice that by changing the ME% from 85% to 80% (reducing the engine’s mechanical efficiency), the corrected HP was reduced whereas the HPc was increased. ET Prediction and Wind Conditions Now let’s say you ran your 3,840-pound 1970 Ford Mustang Notchback at Top Gun Raceway in Fallon, Nev., where there are often raging winds. You can use your actual ET and determine what your ET would have been without the windy conditions. You will need several new pieces of information.
Enter the estimated Frontal Area value: (Frontal Area) AREA S 19.006944 S F Next, see Appendix A — Body Style and Drag Coefficients, for typical body styles and associated drag coefficient values. The default Drag Coefficient value in the calculator is .35. Using Appendix A for a “Notchback or Sedan” style body, we will select a value of .45. Enter the Drag Coefficient of our 1970 Ford Mustang Notchback: KEYSTROKES DISPLAY (Drag Coefficient) DRAG S 0.45 Your disappointing ET was 13.
1. Next, enter vehicle weight, and your actual ET and MPH, the Wind Speed, and if available, Wind Direction, to calculate how the wind effected your speed and time: KEYSTROKES (Wind speed) (Wind direction) DISPLAY LBS S 3840. ET S 13.85 S SPEED S 102.304 MPH WIND S 30. MPH WIND° S 5. ° 2. Calculate the corrected ET and MPH KEYSTROKES (Corrected ET) (Corrected Speed) DISPLAY WIND S 30. MPH ETc 13.281 S SPDc 105.
Your buddy has a 1978 Ford Mustang II with an estimated horsepower of 575 HP and made an ET run of 9.540 seconds. Calculate the estimated Vehicle Weight. KEYSTROKES DISPLAY 1. Enter the estimated HP: HP MSA S 575. 2. Enter the 1/4 ET: ET S 9.54 S 3. Solve for the vehicle’s weight: LBS 2525.953 In this example, your buddy has a 2005 Ford Mustang GT with an estimated horsepower of 520 HP and ran a 1/4 mile at 121.6 MPH. Calculate the estimated Vehicle Weight. KEYSTROKES DISPLAY 4.
KEYSTROKES DISPLAY 0. 1. Enter the estimated Vehicle Weight: LBS S 4280. 2. Enter the 1/4 ET: ET S 13.656 S 3. Solve for the vehicle’s estimated rear wheel HP: HP MSA 332.17 Building from the prior example, let’s correct the estimated rear wheel HP based on current local measured weather conditions of 73° F, absolute pressure of 25.88 in Hg, and 14% relative humidity, then calculate the estimated Horsepower again. KEYSTROKES DISPLAY 4.
Calculating Effects of Changing Tire Sizes Your daily commuter has four-wheel drive, and you want some extra ground clearance for those occasional off-highway excursions on the way home from work. However, before you make the switch to a taller tire, you want to know what the effects will be to your final-drive ratio and even more importantly, to your speedometer as you don’t want to draw any unnecessary attention while you are cruising down the highway.
outputs, starting with the current final-drive ratio input. The effect to the final-drive (D-EFF) of going from a tire diameter of 28.9 to 33 inches is an estimated ratio of 2.697, which will create a fairly noticeable loss in your four-wheeler’s pickup from a stop or while rolling down the highway. To get back to a similar responsiveness on the new 33 inch diameter tires, you would want to install a set of final-drive gears closer to a 3.5 ratio (D-EQV).
Speed, RPM, Gear Ratios, and Tire Relationships Speed, RPM, gear ratios, and tire sizes are interrelated, and with any three values, the fourth value can be solved on your calculator. Getting these four areas set up properly on your road or drag strip vehicle can have very positive performance effects. For the following examples, we will use a 1990 Ford Mustang 5.0 LX with a 5.0 liter V8 engine and the T-5, 5-speed manual overdrive transmission. The manual transmission ratios are 3.35 for 1st gear, 1.
Repeated presses of will toggle through the inputs and outputs, starting with the gear ratio input. From the above calculation, it is estimated that the mighty 5.0 LX will be going about 70 MPH at 5,500 RPM in 2nd gear. In this example, calculate your RPM at 65 MPH in 5th gear: KEYSTROKES DISPLAY 0. You will need to find the correct multiplier for 5th gear. Recall that the final-drive ratio is 3.08 and 5th gear is 0.68. 4.
gear is direct drive and therefore would be the same as the finaldrive ratio you are solving for. KEYSTROKES DISPLAY 0. 7. Enter your RPM, cruising speed of 65 MPH: RPM S 3000. SPEED S 65. M PH 8. Calculate the final-drive ratio: (Final-drive ratio) (Manual trans final-drive ratio) (Auto trans final-drive ratio) GEAR 3.57 RATIO GR-M 3.529 RATIO GR-A 3.582 RATIO Repeated presses of will toggle through the inputs and outputs, starting with the RPM input.
RPM S 3000. SPEED S 65. M PH GEAR S 3.08 RATIO 10. Calculate the New Tire Size: (New tire diameter) TIREn 22.431 SIZE IN Repeated presses of will toggle through the inputs and outputs, starting with the final-drive ratio input. From the above calculation, it is estimated that in order to reach 3,000 RPM in 4th gear, at 65 MPH, the LX could utilize 22.4 inch diameter tires to achieve roughly the same performance as the previous example where you solved for a new final-drive ratio.
Lastly, while carburetors come in many sizes, they are not available in just any size. It is quite possible you won’t find one that is of the exact size you calculated on your Hot Rod Calc. Carburetor sizes are designated by airflow capacity in cubic-feet per minute (CFM). In this example, you want to upgrade your 1968 Pontiac GTO’s carburetor. With all the engine and accessory modifications you have made, your Ram Air II 400 CID engine makes its peak horsepower RPM at about 5400 RPM.
Calculating Carburetor Size With a Known Volumetric Efficiency Building off of the previous example, you want to calculate your userdefined carburetor size based on a known VE value. Suppose through your experience and knowledge of your 1968 Pontiac GTO’s engine specs and modifications, you know you can reach a VE of 95%. KEYSTROKES DISPLAY 1. Calculate a carburetor size based on a user-specified VE.
you with this if they have an air-flow meter), as well as your engine displacement. In this example, your 1968 Pontiac GTO has a Ram Air II 400 CID engine and you want to calculate the engine’s VE at 7000 RPM which is the RPM at your maximum speed. Your measured airflow capacity at 7000 RPM is said to be 625-cfm. KEYSTROKES DISPLAY 0. 1. Enter your RPM, engine displacement, and actual measured airflow capacity at 7000 RPM : RPM S 7000. ENG S SIZE 400. CU IN USER S CARB SIZE 625.
RPM S 3800. 2. Calculate the HP at 3800 RPM: HP MSA 321.966 At 3800 RPM, when your 400 CID engine is producing 445 pounds-feet of torque, it is also producing about 322 HP at the flywheel. Estimating Flywheel Torque at a Known RPM If you know horsepower output at a specific RPM, you can calculate torque at that same RPM. In this example, your 400 CID engine produces 366 HP at 5400 RPM. Calculate the torque for the same RPM. KEYSTROKES DISPLAY 0. 1.
TDC BDC There are several compression ratio effects to consider when determining the appropriate ratio for your application: • The greater the compression ratio, the greater the amount of air/ fuel mix will be compressed. • The greater amount of air/fuel mix that is compressed, the greater the combustion power will be. • The greater the combustion power is, the hotter the combustion is which can lead to detonation.
Your Hot Rod Calc needs several inputs to calculate a Compression Ratio, but you will need track them down and in some cases, measure manually: • Bore and Stroke – You should be able to find this in your engine repair manual. • Head Gasket Bore and Thickness – You should be able to measure or get Head Gasket Bore and Thickness from the gasket manufacturer. • Deck Height – You should be able to measure this manually.
KEYSTROKES DISPLAY 0. 1. Enter the values from the example: BORE S 4. IN STROK S 3.48 IN G-BOR S 4.1 IN (Gasket Bore) G-THK S 0.038 IN (Gasket Thickness) DECK S 0.015 IN (Deck Height) DOME S 4.5 VOL CC (Dome Volume) CHMBR S 76 VOL CC (Chamber Volume) 2. Calculate the Compression Ratio: COMP 8.805 RATIO Repeated presses of will toggle through the inputs and outputs, starting with the entered Bore. The calculated compression ratio is about 8.81:1.
compression ratio, whereas raising the overall chamber volume will decrease the compression ratio. Piston Dome, Deck Height, and Head Gasket Thickness are several ways to effect your compression ratio. In the next section, you can read about one of the more popular ways to increase compression ratio, which is a process known as milling. Calculating Mill Amount Another method of increasing the compression ratio on your engine is to mill, or remove material from, the heads.
starting with the entered Stroke. To raise your compression from 8.5:1 to 10.5:1, your engine building shop would need to remove 0.098 inches of material from the surface of your heads, thus reducing the overall chamber volume and increasing compression. Notice the answer to your mill amount question is given in inches, 0.098 inches, but it’s a simple press of a key to convert to millimeters if necessary. If you press the key, your calculated mill amount of 0.098 inches is converted to about 2.
1. Enter your Stroke and the RPM for which you want to determine piston speed: STROK S 3.48 IN RPM S 4000. 2. Calculate the Piston Speed at 4000 RPM: FPM 2320. M/MIN 707.136 Repeated presses of [Piston Speed] will toggle through the inputs and outputs, starting with the entered Stroke. At 4000 RPM, that is a piston speed of 2,560 feet per minute or about 707.1 meters per minute. What about at 5000 RPM? 3. Enter the RPM for which you want to determine piston speed: RPM S 5000.
6. Enter the Piston Speed for which you want to determine an RPM limit, along with stroke of 3.48: FPM S 3500. STROK S 3.48 IN 7. Calculate the RPM limit: RPM 6034.483 Calculating Engine Displacement You could simply check the factory specs on the engine displacement of your vehicle, but that number is usually a rounded up or down number.
Repeated presses of will toggle through the inputs and outputs, starting with the entered Bore. While the exact displacement of the 1968 Ram Air II engine is about 399.95 CID, it’s a tough number to market by the factory. To make it simple on the guys in the suits, the displacement was rounded up to a nice even 400 CID. Notice the engine displacement is also displayed in cubic-centimeters and liters, and lastly the cylinder volume is calculated and displayed in cubicinches.
Repeated presses of will toggle through the inputs and outputs, starting with the entered Bore. Calculating Bore and Stroke Building from one of the previous examples, you want to push your cubic inch displacement to a maximum of 405 CID to be competitive at your local club races as well as meet class engine requirements. Recall that the stock bore and stroke on the 1968 Ram Air II engine is 4.12 and 3.75 inches, respectively. Keeping the stock Stroke length, calculate a new Bore size.
4. Calculate the new Stroke length: STROK 3.797 IN Notice you can also meet your goals by keeping the stock bore, and going to a longer stroke of 3.797. In terms of cost, it will be more cost effective to go over bore to reach your goals in this particular example.
APPENDIX A – BODY STYLE AND DRAG COEFFICIENTS* BODY STYLE DRAG COEFFICIENT Open Convertible 0.5 – 0.7 Station Wagon and Van Body 0.5 – 0.6 Notchback or Sedan Fastback Fairings all around, streamlined shape 0.4 – 0.55 0.3 – 0.4 0.2 – 0.25 K-shape Optimum streamliner 0.23 0.15 – 0.2 Motorcycles 0.6 – 0.7 Trucks 0.8 – 1.5 Buses 0.6 – 0.7 * Aerodynamic drag data from Bosch Automotive Handbook .
APPENDIX B – HOLLEY JET CHART AND JET ORIFICE AREA AND CONVERSION CHART Main Jet Number, Drill Size, and Flow JET NO. DRILL SIZE FLOW 40 .040 117 41 .041 122 42 .042 129 43 .043 135 44 .044 142 45 .045 149 46 .046 156 47 .047 163 48 .048 170 49 .049 178 50 .049 185 51 .050 194 52 .052 203 53 .052 212 54 .053 221 55 .054 230 56 .055 240 57 .056 251 58 .057 262 59 .058 273 60 .060 285 61 .060 298 62 .
63 .062 325 64 .064 341 65 .065 357 66 .066 374 67 .068 392 68 .069 411 69 .070 429 70 .073 448 71 .076 470 72 .079 492 73 .079 517 74 .081 542 75 .082 566 76 .084 587 77 .086 615 78 .089 645 79 .091 677 80 .093 703 81 .093 731 82 .093 765 83 .094 795 84 .099 824 85 .100 858 86 .101 890 87 .103 923 88 .104 952 89 .104 987 90 .104 1014 91 .
92 .105 1150 93 .105 1200 94 .108 1260 95 .118 1320 96 .118 1375 97 .125 1440 98 .125 1500 99 .125 1570 100 .128 1640 .
Jet Orifice Area Conversion Jet Size Dia. (") Jet Size Area (sq. ") Jet Size Dia. (") Jet Size Area (sq. ") 0.02 0.00031 0.049 0.00189 Jet Size Dia. (") Jet Size Area (sq. ") Jet Size Dia. (") Jet Size Area (sq. ") Jet Size Dia. (") Jet Size Area (sq. ") Jet Size Dia. (") Jet Size Area (sq. ") 0.078 0.00478 0.107 0.00899 0.136 0.01453 0.164 0.02112 0.079 0.0049 0.108 0.00916 0.137 0.01474 0.165 0.02138 0.022 0.00038 0.051 0.00204 0.08 0.00503 0.109 0.00933 0.138 0.01496 0.
APPENDIX C – Default Settings After a Clear All ( ) your calculator will return to the following settings: STORED VALUES DEFAULT VALUE 60.0 °F Air Temperature Absolute Pressure 29.92 in Hg Moisture 0% RH Elevation 0 FEET 100% ADI Density Altitude – 0.001 FEET Drag Coefficient 0.35 Mechanical Efficiency 85% 8 #Cylinders 100% Volumetric Efficiency If you replace your batteries or perform a Full Reset*, press , hold down , and press .
APPENDIX D – Care Instructions Please follow the guidelines listed in this section for proper care and operation of your calculator. Not following the instructions listed below may result in damage not covered by your warranty. Refer to the Repair and Return section on page 44 for more details. Do not expose calculator to temperatures outside the operating temperature range of 32ºF – 104ºF (0ºC – 40ºC). Do not expose calculator to high moisture such as submersion in water, heavy rain, etc.
APPENDIX E – Accuracy/Errors, Auto Shut-Off, Batteries, Reset ACCURACY/ERRORS Accuracy/Display Capacity — Your calculator has an eightdigit display made up of eight digits. Errors — When an incorrect entry is made, or the answer is beyond the range of the calculator, it will display the word “ERROR.” To clear an error condition you must hit the button once. At this point you must determine what caused the error and re-key the problem.
Replacing Batteries Should your calculator display become very dim or erratic, replace the batteries. Note: Please use caution when disposing of your old battery, as it contains hazardous chemicals. Replacement batteries are available at most discount or electronics stores. You may also call Calculated Industries at 1-775-885-4900.
WARRANTY, REPAIR AND RETURN INFORMATION Return Guidelines 1. Please read the Warranty in this User’s Guide to determine if your Calculated Industries product remains under warranty before calling or returning any device for evaluation or repairs. 2. If your product won’t turn on, check the batteries as outlined in the User’s Guide. 3. If you need more assistance, please go to the website listed below. 4.
DAMAGES RESULTING FROM MISUSE OR ABUSE. To obtain warranty service in the U.S., please go to the website. A repaired or replacement product assumes the remaining warranty of the original product or 90 days, whichever is longer. Non-Warranty Repair Service – U.S.A. Non-warranty repair covers service beyond the warranty period, or service requested due to damage resulting from misuse or abuse. Contact Calculated Industries at the number listed above to obtain current product repair information and charges.
66 — HOT ROD CALC™
FCC Class B This equipment has been certified to comply with the limits for a Class B calculating device, pursuant to Subpart J of Part 15 of FCC rules. Legal Notes Software copyrighted and licensed to Calculated Industries by Specialty Calculator Technologies, LLC, 2009. User’s Guide copyrighted by Calculated Industries, Inc., 2009. Hot Rod Calc™ is trademarked and Calculated Industries® is a registered trademark of Calculated Industries, Inc. ALL RIGHTS RESERVED Designed in the U.S.A.
FCC Class B This equipment has been certified to comply with the limits for a Class B calculating device, pursuant to Subpart J of Part 15 of FCC rules. Legal Notes Software copyrighted and licensed to Calculated Industries by Specialty Calculator Technologies, LLC, 2009. User’s Guide copyrighted by Calculated Industries, Inc., 2009. Hot Rod Calc™ is trademarked and Calculated Industries® is a registered trademark of Calculated Industries, Inc. ALL RIGHTS RESERVED Designed in the U.S.A.
