Neptune Engineering, Inc. is a service company that provides data on motor vehicles.  Currently, Vehicle Crush Stiffness Coefficients, Motor Vehicle Manufacturers (MVM) Specification/Brochure Documents, NHTSA & Transport Canada Crash Test Reports, Vehicle Static Stability Factor Reports and a Sisters & Clones Listing are available.

Crash Test Reports (w/ photographs)
125 Crash Test Reports have been added to our collection.
These new documents, from NHTSA, are for 2010-2012 model year vehicles.

Crush Stiffness Data Update
All of the crush stiffness files have been updated.
The CRASH and SMAC stiffness coefficient values are now displayed rounded
to the nearest 10's digit, e.g. 157 is displayed as 160.

New Crush Stiffness Data
296 crush stiffness files have been created/updated.
These new documents are for 2009-2011 model year vehicles.
Click here to see a list the new data (5/11/2011)

The Vehicle Interchange List (Sisters & Clones List) has been updated for 2011.
Thank you, Gregory C. Anderson of Scalia Safety Engineering.
This document is a FREE download.

Crash Test Reports (w/ photographs)
162 Crash Test Reports have been added to our collection.
These new documents, from NHTSA, are for 2001-2011 model year vehicles.

Motor Vehicle Manufacturers Specifications
249 MVM Spec Documents & Brochures have been added to our collection.
These new documents are for 2011 model year vehicles.
Please visit our MVM Specs Information Page to discover more about this great deal and view example data.

New POLE Crush Stiffness Data
75 crush stiffness files have been created from pole impact tests.
These new documents are for 1986-2011 model year vehicles.
Click here to see a list the new data (1/8/2011)
Click here to see an example Side-Pole data file

The analysis of the test data is based upon concepts and procedures presented in SAE papers 920607, 940913, 950358, 960896, 980024, & 199-01-0105, with changes for geometry and the non-energy absorbing properties of the pole.  The coefficients are calculated using only the direct damage portion of the total damage profile.  You will see in the DDW (Direct Damage Width) column a value usually of 10 inches.

At first glance the coefficients may appear quantitatively high.  This is due to the relative narrow width of the direct damage.  This is also due to the impact damage extending full height from the lower edge of the rocker panel vertically upward to the upper edge of the roof.  In a traditional FMVSS 214 side test, the direct damage extends vertically through a distance of approximately 21 inches.

An additional column, FoBP (Forward of B-Pillar), has been added to the data.  This represents the location of the center of the direct damage relative to the B-Pillar.  The value of this variable will usually be positive since in most cases the line of action of the pole is aimed at the head of the driver dummy.  A negative value indicates the line of action was located rearward of the B-Pillar.

When viewing a list of the data you will notice that there is only Adjusted versions of the data files.  The spacing and location of the reported crush measurements are inadequate to delineate the direct damage.  Thus, a non-adjusted analysis is not performed.

New Crush Stiffness Data
190 crush stiffness files have been created/updated.
These new documents are for 1995-2010 model year vehicles.
Click here to see a list the new data (11/27/2010)

Crash Test Reports (w/ photographs)
23 Crash Test Reports have been added to our collection.
These new documents, from NHTSA, are for 2001-2011 model year vehicles.

Further Explanation of the Update to the Crush Stiffness Analysis Procedure
A document that further explains the updated procedure used to calculate crush stiffness coefficients, that was first announced in May 2005, is now available for your review.

The purpose of the update to the procedure was primarily to further reduce the effect of changes in vehicle structure, and non-uniformity and experimental inaccuracy associated with the measurement of vehicle damage by the crash test facilities.

This update is a refinement of the previous procedure.  Coefficient data produced using the previous procedure remains valid.  It is important that the user of crush stiffness coefficients understands how the coefficients were determined.  It is important that such knowledge be considered when rendering the engineering judgments required during their use.  The coefficients are determined using concepts and procedures presented in Society of Automotive Engineers papers 920607, 940913, 950358, 960896, 980024 & 1999-01-0105.

Please contact us should you have any question after reviewing the document.

Update of the Crush Stiffness Analysis Procedure
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