Larson Systems Inc.
Manufacturing Expert Spring Testing Solutions Since 1979
Built to order.
LSI’s Valve Spring Tester will be an indispensable part of your engine maintenance. View force and length test readings on the bright, two-line LED display and have absolute confidence in the accuracy of your tests thanks to built in deflection compensation.
We have high precision valve spring testers that are ideal for valve springs used in go-kart or snowmobile engines all the way up to nitro injected top fuel engines.
This is an inexpensive tester with full features. The tester has a two-line backlit LED display of force and length and has deflection compensation for accurate readings at all times. It has a rugged cast-aluminum and steel frame, precision rack and pinion drive with adjustments for wear and convenient hand operation to apply force and adjust length. It includes standard length lock and mechanical overload stops to protect the tester from damage.
What is length deflection compensation?
All force/lengh testing devices, regardless of manufacturer, have additional deflection by the load cell and tester frame which occurs as the spring is loaded. If you buy/use a tester without deflection compensation, measurements might include significant length errors.
Spring deflection, also known as spring travel or motion, is the action of a compression spring compressing (being pushed), an extension spring extending (being pulled), or a torsion spring winding (being twisted) when a load is applied or released. This is one characteristic (spring deflection) that is measured by a Larson Systems Spring Tester.
Larson Systems has BUILT-IN Length Deflection Compensation so that the user does not have to calculate and apply length corrections. Most competitors do not have length deflection compensation.
With a Larson Systems product, forget about calculating load cell and frame deflection when testing, we’ve got you covered.
Try our software for “Spring Testing Data at Your Fingertips”. With Larson System’s SDC Software, your spring testing data can be accessed, stored and manipulated as it is generated. Store specifications for different parts, load a set of parameters and clearly see which springs are out of spec using the on-screen graphical representation of the testing results. Save and print results or open the results file in Microsoft Excel. You have complete control of your testing data.
| Load Cell Capacity |
Resolution |
| 200 lb | 0.1 lb |
| 91 kg | 0.05 kg |
| 890 N | 0.5 N |
| 750 lb | 0.5 lb |
| 340 kg | 0.2 kg |
| 3,336 N | 2 N |
| 1,500 lb | 1 lb |
| 680 kg | 0.5 kg |
| 6,672 N | 5 N |
| Accuracy = ± Full Scale Resolution x 2 | |
| Description | Part Number | |
|---|---|---|
| V200 - 200 lb Valve Spring Tester | 050-0000-0109-04 | Get a Quote |
| V750 - 750 lb Valve Spring Tester | 050-0000-0109-02 | Get a Quote |
| V1500 - 1,500 lb Valve Spring Tester | 050-0000-0109-03 | Get a Quote |
| Description | Part Number | |
|---|---|---|
| RS232 / USB ouput, DHT Family | 050-1000-0064-00 | Get a Quote |
| Description | Part Number | |
|---|---|---|
Thru-Rod Support Kit (1/16 to 1/8" Ø x 4")
Thru-Rod Support Kit (1/16 to 1/8″ Ø x 4″)Part Number: 025-0000-0225-00 Includes rods: 1/16, 3/32 & 1/8″ Ø x 4″ long, accompanying plates with matching holes, as well as upper and lower plates without holes. | 025-0000-0225-00 | Get a Quote |
4" Ø Platforms / Thru-Rod Support Kit (1/16 to 11/16" Ø ID x 8")4″ Ø Platform / Thru-Rod Support Kit (1/16 to 11/16″ Ø ID x 8″)
Part Number: 025-0000-0485-00 This kit is more flexible than other thru-rod options and can accommodate larger thru-rods. In addition, springs up to 4″ in diameter can be tested with the over-size platforms. Includes rods: 1/16″ to 11/16″ x 8″ long, and accompanying plates with matching holes. 4″ Ø plate can double for testing springs with larger diameter. NOTE: Deflection compensation is calibrated at the center of the platforms. The length error would vary depending on the load and the location of the load. A centered load is always best and will read accurately, to within ± 0.001″ (0.025 mm) of the actual length. A large off-center load near the edge of the extended platform may be off by up to 0.008″ (0.2 mm). Installation & Use 
| 025-0000-0485-00 | Get a Quote |
Platforms - 4" Ø (Pair for 5/16-18 Mount)
Platforms – 4″ ØPart Number: 025-0000-0191-00 For testing larger diameter compression parts. | 025-0000-0191-00 | Get a Quote |
| Set of 2" Spring Platforms (HT Tool Steel, No Hole) | 025-0000-1597-00 | Get a Quote |
Single Stop Rod
Single Stop RodPart Number: 025-0000-0293-00 One compression test stop only. | 025-0000-0293-00 | Get a Quote |
Double Stop Rod
Double Stop RodsPart Number: 025-0000-0333-00 Two compression test stops, or one compression test stop and one extension test stop. | 025-0000-0333-00 | Get a Quote |
NiCad Rechargeable Battery (4-8 hr life)
NiCad Rechargeable BatteryPart Number: 025-0000-0294-00 Add an internal rechargeable battery for easy portability. A fully charged battery lasts approximately 8 hours. | 025-0000-0294-00 | Get a Quote |
Dust Cover - 5" Range Rods
Dust CoverPart Number: 059-1000-0026-00 | 059-1000-0026-00 | Get a Quote |
| Travelling Case | 025-0000-0487-03 | Get a Quote |
| 8 Piece Valve Spring Retainer Set | 025-0000-0783-00 | Get a Quote |
| Rubber Mounting Foot Upgrade | 025-0000-0464-02 | Get a Quote |
| Solid Height (Coil Bind) Protector - 2" Hand Testers | 025-0000-0458-00 | Get a Quote |
| Description | Part Number | |
|---|---|---|
Ink Jet Printer (includes Parallel to 9pin RS 232 Adapter Cable)
Inkjet Printer (Includes Cable / Adapter 025-0000-0458-01)Part Number: 025-0000-0464-02 Inkjet printer prints single feed 8.5×11″ paper. Epson Stylus C88+ inkjet printer. Laser sharp text. If you wish to use your own printer with an RS 232 equipped product, you may choose to purchase only the Parallel to RS 232 Adapter Cable. | 025-0000-0464-02 | Get a Quote |
RS 232 to Parallel Printer Cable / Adapter (DB9)
RS 232 to Parallel Printer Cable / AdapterPart Number: 025-0000-0458-01 Connect any parallel printer to any RS 232 device. These cables are included with our InkJet Printer. | 025-0000-0458-01 | Get a Quote |
| Description | Part Number | |
|---|---|---|
| SSS - Statistical & Spreadsheet Interface Software Total Spring Inspection | 050-0000-0075-00 | Get a Quote |
| Excel Templates for Valve Spring Set Building and Certification | 050-0000-0140-00 | Get a Quote |
| Spring Data Collector Software (for use with DHT family testers) Spring Data Collection With Larson Systems’ SDC Software, your spring testing results can be accessed, stored and manipulated as they are generated, giving you complete control of your spring testing data. Click here to view | 050-1000-0060-00 | Get a Quote |
| Description | Part Number | |
|---|---|---|
| Power Supply, 100-240 VAC 50-60 Hz (USA Plug) | 025-1000-0396-00 | Get a Quote |
| Power Supply, 100-240 VAC 50-60 Hz (International Plugs) | 025-1000-0396-04 | Get a Quote |
| Description | Part Number | |
|---|---|---|
| NIST Traceable Calibration Certificate | 100-1000-003-05 | Get a Quote |
