Computer Program, Electronics and Sensors to Measure Valve Spring Rates, Seated Force, Open Force, etc.
"At Gray Motorsports, when we implemented The Performance Trends Auto Spring Tester last season, we saw an improved consistency in our engine performance and greater reliability of our valve springs. It has been helpful with our NHRA Mello Yello Fuel Funny Car that Johnny drove last season and our Pro Stock program this season. We even had a situation when we caught a valve spring that would have failed before it got put into service. This tool has proven to Gray Motorsports it is the best way for us to test valve springs for our race teams."
Endorsed by: Gray Motorsports - Johnny Gray, Shane Gray
Our Valve Spring Testers are available either as a Manual tester or Automatic (pneumatic) tester. The automatic tester can be outfitted to provide up to 2500 lbs of force (or higher) to precisely test the huge springs used in today's top drag racing classes, as used by Gray Motorsports. The manual tester can be purchased with either a very easy Basic version of the software, and a full featured Plus version. The automatic testers all come with the Plus version. The screens below show the 2 software versions.
Basic version of Software (very simple)
The Basic version shown above is just this screen. It lets you test springs one at a time and very accurately determine Seated Force and Open Force at spring lifts you enter, Spring Rate, Binding Height, and Bind Height Clearance, and Non-Linearity in percent.
Plus version of Software (all features)
The Plus version lets you record, save, analyze, compare, graph, report and print your results, saving you time and providing accurate and professional results. Results include:
Other screens from the Plus version are shown below.
The Valve Spring Tester can be ordered with either the Basic or Plus software. Basic versions can be easily upgraded to the Plus version for $100.
Other Plus features include:
Here's a printed report from our Automatic Valve Spring Tester, showing its
outstanding repeatability (highlighted in yellow). It also shows where
your company logo can go, in the upper left corner.
to view the PDF file of this report with better detail and quality.
Damping lets you rate the damping effect of dual and triple springs with dampers. The higher the internal damping in the spring (like a shock absorber), the more heat that is generated, but also the better chance of keeping the valve train under control by avoiding spring surge.
Non-Linearity lets you see if the springs are linear or not. Sometimes springs are designed to be non-linear, and now you can actually measure 'how much'.
Manual USB Spring Tester Automatic USB Spring Tester
Spring Tester Specs:
Manual Spring Tester:
Automatic Spring Tester:
* We have a special load cell mount which can provide for springs up to at least 3.30" height, part # SPV-L3+ Depending on the tolerance of the actual press, this could be 3.40 inches or more.
** Higher range 2500 lbs load cell available, part # SPV-LCNS . The Manual Tester needs to be bolted securely to a bench top for testing high rate springs. The Automatic Tester does not need to be bolted down, but does require shop air pressure, 90-150 psi.
*** Special 0-250 lb and 0-500 lb range testers are available (part # SPV-LCNS) for lighter duty springs for the same price. As these are more sensitive instruments, you must be careful not to over-range these testers.
**** SPV11A-HFO High Force Option for the Automatic Spring Tester replaces the standard pneumatic cylinder with a much larger unit, 2500 lb load cell, and other modifications to accommodate this larger cylinder (2500 lbs force can be generated with 130 psi air pressure and measured with optional 2500 lb load cell). This is the tester used by Gray Motorsports and others needing to test huge valve springs.
Power TechPT-200 Software and Electronics Upgrade Kit:
Our software can be added to a Power TechPT-200 spring tester using our USB interface. for details.
Valve Spring Tester, Complete Kit:
We offer a kit where you can build your own spring tester. The Valve Spring Tester, Complete Kit (part # SPV11C-STK) with calibrated Load cell and 3" length sensor. The parts shown below are designed to be fitted to a standard "1 ton" arbor press, with an opening of about 5.25 inches (130 mm). for an example. The press will require some machining, typically drilling of holes and tapping of some holes. This kit includes EVERYTHING except the press. This kit only makes sense if you live overseas and want to avoid the expensive shipping (which can be as high as $400 or more) for the heavy 55 lb (22 Kg) complete test stand. Shipping for just this kit can be as low as $80.
What You Need:
Computer with Windows XP, Vista, Windows 7, Windows 8, Windows 10. The Automatic Valve Spring Tester also requires clean shop air, from 90-150 psi. Less pressure is adequate if you are doing lower rate springs.
What You Get:
Program CD with user manual in PDF format on the CD. Example test files preloaded in the Example library for you to start with. Tester includes tester shown above, cable to connect to computer's USB port (which is what powers the electronics), factory calibration and "quick start" sheets. User manual is on the CD as PDF file.
More Information, Download Demo:
to go to our Demo Downloading page to download a FREE Valve Spring Tester Demo.
Call 248-473-9230. Visa, Mastercard, Am Exp and Discover accepted.