User Guide

Dyno2000 Advanced Engine Simulation—29

in your flowbench test into the Data Points field (click up to increase, down to

decrease). Then enter the test-valve diameters and the pressure drop (in inches of

0) at which the tests were performed. Finally enter flow and valve-lift test data.

Note 1: You may press the Calc Others button at any time to fill in the remaining

lift fields with the same “step” value that was established in the previous fields. The

Calc Others button is smart enough to change step values at higher valve lifts.

Note 2: If you have fewer data points for one of the valves, simply repeat the highest

measured flow value to “flush out” the remaining data points. This technique has

been shown to produce accurate simulations.

You can save the flow data to your hard drive at any time by pressing the Save

As button. Recall previously saved flow data with the Open button.

Pressing OK will load the new test data into the engine database and display the

custom flow Description in the CYLINDER HEAD category.

Valve Diameters

The Valve Diameter menus are located in the lower portion of the CYLINDER

HEAD category. The first selection is Auto Calculate Valve Size. This feature

instructs the simulation software to determine the most likely valve sizes to be used

with the current engine based on an assessment of the current bore diameter and

the Cylinder Head selection. When the Auto Calculate function is activated Auto will

be displayed next to the calculated sizes, and it remains active on the current engine

until turned off (by selecting it a second time). Auto Calculation is turned off by

default when the Dyno2000 is started and whenever Clear Components is chosen

from the Edit menu.

Auto Calculate Valve Size is especially helpful if you are experimenting with

several different bore and stroke combinations or comparing different engine con-

figurations. Auto Calculate will always select valves of appropriate diameter for the

Valve Size Menus

Intake And Exhaust Valve Sizes

Select valve sizes for the intake and

exhaust valves from drop-down menus.

If you choose Auto Calculate Valve Size

from either the intake or the exhaust

menu, the Dyno2000 will size all valves

appropriately, based on the cylinderhead

type and the bore diameter. Deselecting

Auto Calculate Valve Size on either the

intake or the exhaust valve-size menus

will disable this feature on all valves.