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Once you are comfortable with the formulas and concepts presented in this book, you can take advantage of more sophisticated tools that let you actually model and test your engine-building ideas on your home computer. Engine-simulation software has been around for more than 20 years, and it has steadily improved. Current programs are very robust and surprisingly affordable. Those presented here represent the cream of the crop and you can expect accurate and instructive results from all of them. We’ll take a brief look at the top engine simulators first and then a number of support programs that allow you to test your engine models on the dragstrip and at Bonneville or any of the other top speed venues such as El Mirage and shorter one-mile tracks. In the end you will undoubtedly end up purchasing some of these programs and you will thoroughly enjoy using them to test your ideas. They give you unparalleled freedom to design and test endless engine combinations while sitting around the house in your underwear and without spending a dime on dyno time.

This Tech Tip is From the Full Book, PERFORMANCE AUTOMOTIVE ENGINE MATH. For a comprehensive guide on this entire subject you can visit this link:

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PC-based engine design and simulation software for home enthusiasts is affordable, surprisingly sophisticated, and capable of delivering accurate and highly instructive results.

Performance Trends’ Engine Analyzer series offers basic, mid-level, and highend engine simulation for all types of engines including turbocharged, supercharged, and nitrous-oxide versions. It provides highly detailed results with graphic overlays for easy comparisons.

Advanced computer skills are not required to operate these programs. They are all compatible with contemporary 32-bit operating systems up to and including Windows Vista and Windows 7. Most current home computers have the memory and processing speed to run them easily, although some advanced simulations may take a few minutes. If you bought your computer within the last decade you should have no trouble running these simulations. They walk you through all the steps, they provide excellent support and documentation and in some cases, online updates. For most applications, you fill in the blanks with the appropriate specs and/or choose components from extensive menus. It’s very easy and surprisingly instructive to the point that most programs will expand your knowledge and your engine planning skills just from using them.

Performance Trends

Performance Trends (www.performancetrends.com) offers three versions: Engine Analyzer, Engine Analyzer Plus, and Engine Analyzer Pro. All of them simulate almost any engine combination you can conceive, including bore and stroke sizes from 1 to 10 inches and up to 16 cylinders with multiple valves (2 to 6) and an RPM range from 500 to 30,000.

Final results in Engine Analyzer are displayed in tabular form and you can also display a cylinder simulation with a functional piston and Valves. You select the speed of the simulation and EA displays relative information such as piston to valve clearance, cylinder pressures and temperatures and corresponding crank angle.

Engine Pro also incorporates intake port flow details relating valve lift to crank angle, piston speed and related flow demand. This screen displays a piston speed summary, shift points, and red line.

Engine Analyzer

The basic version runs simulations for gasoline and alcohol in normally aspirated mode or with turbocharged, supercharged, or nitrous options. It uses wave tuning algorithms for VE prediction and includes spark settings and detonation simulation. Supercharged applications can be modeled with and without intercooling and they include provisions for both centrifugal- and Roots-type superchargers. More than 70 engine specifications can be input to describe your proposed engine to the program. From this the simulation delivers up to 23 data outputs per RPM and 18 special calculations, such as displacement, valve flow areas, dynamic compression ratios, etc. The program estimates a cylinder head flow curve generated from a percentage-based “flow efficiency” that you choose from a table, or you can input up to three flow data points from actual flow bench data.

The program includes utility calculation screens that help you model compression ratios and other auxiliary calculations needed to support the simulator. It plots torque and horsepower per RPM graphically with up to seven overlays for run-to-run comparisons. From input or selected cam data it shows valve lift per crankshaft degree to help you evaluate cam profiles. It uses ASCII (American Standard Code for Information Interchange) text so data can be written to a file with use-defined options for importing to spreadsheets such as Microsoft Excel. An optimize feature automatically chooses best port or runner size and length and can spec for best peak torque and horsepower or average torque and horsepower. You can input any 0.050-inch-lift cam value or a specified value including advertised timing plus lift, lash, rocker ratios, centerlines, ramp ratings, and so on.

Engine Analyzer Plus The mid-level program has ten additional features, including diesel and alternate fuel modeling. Gasoline and alcohol can be modeled at standard and enriched air/fuel ratios for detonation control and you can also simulate with propane gas, propane LPG, or CNG (methane) fuels. The software adjusts spark for best power and predicts knock and retard timing to prevent detonation. This version incorporates 20 additional inputs including the ability to check valve-to-piston clearance and full cylinder head flow data. You can input flow volumes with up to 8 valve-lift increments. Each of the 23 outputs calculated for each RPM can also be graphed with 7 overlays. And you can substitute new engine mods right in the graph screen and immediately see changes to the power curve.

Engine Analyzer Pro

This version incorporates intake and exhaust port pressures based on Finite Difference wave simulation. It specifies net flow over the entire valve event including net trapped fresh mass charge and heat transfer to all chamber components. Simulations take longer in this version because of the greater number of calculations requested of the processor. Precise information calculated includes piston position, valve opening and flow, cylinder pressure, instantaneous torque, and piston thrust in onetenth- degree increments up to 720 degrees to complete a full cycle. Successive cycles are repeated to obtain a constant result based on wave tuning that splits intake and exhaust runners into small sections to precisely calculate pressure, velocity, momentum, friction losses, heat transfer, and other pertinent information that can require up to 60 seconds or more of calculation time, depending on the degree of accuracy you have specified.

The program auto-selects best spark advance or you can input a forced spark curve with 6 break points that you can specify produces best power for the desired burn rate. It also calculates a knock index so you can model with trace detonation. While no program can fully predict conditions that may cause intermittent detonation in one or more cylinders, Engine Analyzer Pro delivers highly accurate predictions based on qualified assumptions.

This advanced version offers up to 50 outputs per RPM including some only applicable to special valvetrain dynamics or turbo/supercharger applications. With up to 42 special calculations, it includes cam specs at 0.200-inch tappet lift and lift at TDC. You can also specify metric inputs and outputs and graph 25 different types if you have cycle data including valve lift, piston thrust, port pressure, valve flow versus crank angle and cylinder volume (pressure/ volume diagrams). In this version you can overlay up to 12 different tests for comparison purposes.

The “Chain Calculation” feature

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