Performance Trends, Inc.

Producing Quality Computer Tools for Racers and Engine Builders since 1986

Spring Wiz

Spring Wiz v1.1 for Windows XP/Vista/Windows 7/Windows 8, Windows 10

Computer Program to make Valve Spring Calculations which affect Spring Rate, Bind Height, Natural Frequency, Open Force, Stress, and Much More

This program lets you estimate valve spring performance from several different inputs, and lets you combine springs into 2 and 3 pack springs.  The Plus Version described below allows for more spring details and other features.

Once you have the spring specs entered, the program will calculate critical spring characteristics like bind height, natural frequency, Spring Rate, force at various valve lifts, internal stress, and much more.  You can also do a side-by-side comparison of 2 different spring pack designs.

Then you can combine the valve spring info with cam and valve train data to do dynamics analysis to find potential spring surge problems.  The program is similar to the old, DOS Spring Master program developed by Steve Gruenwald of Integral Cams, which is no longer supported.  

 

The Analysis Screen shows the analysis of the cam profile combined with the spring data and other valve train specs, including such things as:

  • Frequency analysis.   Frequency analysis is done by FFT (fast fourier transformation) and is used to determine the likelihood of spring surge at various RPMs.  
  • Required Force and Safety Margin which determines if you have enough spring to control the valve train mass for the rpm range you want to run.
  • Pointing out if the stress in the spring is very high.
  • Pointing out if the valve's seating velocity is too high.
  • And much more.

 

 

to view a complete report of the analysis.

 

"Find a Spring"

The powerful and easy "Find a Spring" feature lets you find several combinations of valve spring specs to meet your engine's requirements.  You will enter info about your engine's valve train and camshaft, and enter a few simple inputs as shown below, and then the program will find a valve spring to control this valve train at the RPM you have specified.

The results from "Find a Spring" are shown below, and consist of 20 combinations of Seated Force (installed force) and Spring Rate which will control the valve train.  That means it will keep the valve train in contact with the cam profile at the specified RPM.  The Safety Factor is how much more spring force the program suggests over the bare minimum needed.  For example, if 400 lbs is needed, but you have specified a 20% safety factor, the program will suggest a spring combination which produces 480 lbs at the critical valve lift.  The program also suggests a minimum valve spring natural frequency to avoid valve spring surge.

Once you have these suggestions, now you can go back and build your spring pack which produces the performance you require.

 

Plus Version

The Plus version adds additional features to the Spring Wiz program, including:

  • Allowing "Rev Kit" spring to be included in the analysis.  A "Rev Kit" is a spring which only restrains the lifter in push rod engines.
  • Allows for more details about the spring properties, including cross section "Aspect Ratio" of the spring wire (circular or oval), material properties, and non-linearity (coming soon).
  • Allows for reading a "1440" point cam file, recorded at 0.25 cam deg.  (The program still uses data at every 1.0 cam degrees, but you can choose which 360 data points to use of the 1440.)
  • Allows for more details (actual durations at either seat, .040"/.050", and/or .200") for calculating a Ramp Rating.
  • Preference setting of Metric units like millimeters, Newtons or KG, MPa, etc.
  • Preference setting to choose either Newtons or KG for the force units.

Main Screen for Plus Version (Aspect Ratio 'Help' shows example of definition when you hover mouse over an input)

 

What you need:

Computer with Windows XP, Vista, Windows 7, Windows 8, Windows 10.  

 

More Information, Download Demo:

to go to our Demo Downloading page to download a FREE Spring Wiz Demo.

 

To Order:


Spring Wiz: Our DOWNLOAD ONLY option. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. You will not be charged shipping.

$
199.95


 Spring Wiz: If you want a CD shipped to you, click on Add to Cart below. There will be shipping charges added to your order. You can still download the demo and get your unlock code sooner with this option.

$
199.95 plus shipping
 
Spring Wiz Plus: Our DOWNLOAD ONLY option. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. You will not be charged shipping.

$
299.95
 Spring Wiz Plus: If you want a CD shipped to you, click on Add to Cart below. There will be shipping charges added to your order. You can still download the demo and get your unlock code sooner with this option.

$
299.95 plus shipping