Approval Details

Valid E.O.

Validity

This Executive Order approved the specified parts on on April 19, 1974.
As of Sunday, May 18th, 2025 this Executive Order has not been overturned or superceeded.

Approved Parts

Models
1974 and older model-year vehicles, EXCEPT: (1) VW (2) Diesel powered vehicles (3) Fuel injected (4) Supercharged vehicles

This Executive Order may be listed as:
  • C.A.R.B.E.O. D-31
  • Executive Order 31 / D31
  • ARB # D-31
  • Executive Order No: D-31
  • C.A.R.B. No. D-31
  • Resolution D-31
For Free CARB Executive Order Status verification, email an image of the device Executive Order label as well as the Year/Make/Model and Test Group # of the vehicle to [email protected]

Download: Executive Order D-31 PDF

D-31 Document:

CARB_D-31

State of California AIR RESOURCES BOARD EXECUTIVE ORDER D—31 Relating to Exemptions under Section 27156 | of the Yehicle Code NC INDUSTRIES "G. R. VALVE" Pursuant to the authority vested in the Air Resources Board by Section 27156 of the Vehicle Code; and Pursuant to the authority vested in the undersigned by Section 39023 of the Health and Safety Code; IT IS ORDERED AMND RESQLVED: That the installation of the "G. R. Vailve" manufactured by NC Industries has been found to not reduce the effectiveness of required motor vehicle pollution control devices and, therefore, is exempt from the prohibitions of Section 27156 of the Vehicle Code for 1974 and older model—year vehicles with the exception of Volkswagen, diesel, fuel injection, or supercharged engine vehicles. The device consists of a relief valve with a filter and can be identified by the "G. R. Valve" stamp. The valve is inserted between the PCV valve and the intake manifold and permits a small amount of additional air to enter the PCV line. This Executive Order is valid provided that insta]]étion instructions for this device will not recommend tuning the vehicle to specifications different than those listed by the vehicle manufacturer. Changes made to the design or operating conditions of the device as originally submitted to the Air Resources Board for evaluation that adversely affect the performance of the vehicle‘s pollution control devices shall invalidate this Executive Order. Marketing of this device using an identification other than that shown in this Executive Order or marketing of this device for an application other than those listed in this Executive Order shall have prior approval of the Air Resources Board. This Executive Order does not cénstitute any opinion as to the effect that the use of this device may have on any warranty efther expressed or . implied by the vehicle manufacturer.

"C. R. Valve" ' Executive Order D—31 a THIS EXECUTIVE ORDER DOES NOT CONSTITUTE A CERTIFICATION, ACCREDITATION, APPROVAL, OR ANY OTHER TYPE OF ENDORSEMENT BY THE AIR RESQURCES BOARD OF ANY CLAIMS OF THE APPLICANT CONCERNING ANTI—POLLUTION BENEFITS OR ANY ALLEGED BENEFITS OF THE "G. R. VALYE" DEVICE. No claim of any kind, such as "Approved by Air Resources Board" may be made with respect to the action taken herein in any advertising or other oral or written communication. Section 17500 of the Business and Professions Code makes unlawful, untrue or misleading advertising and Section 17534 makes violation punishable as a misdemeanor. Sections 39130 and 39184 of the Health and Safety Code provide as follows: "39130. No person shall install, sell, offer for sale, or advertise, or, except in an application to the board for certification of a device, represent, any device as a motor vehicle pollution control device unless that device has been certified by the board. No person shall sell, offer for sale, advertise, or represent any motor vehicle pollution control device as a certified device which, in fact, is not a certified device. Any violation of this section is a misdemeanor." "39184. (a) No person shall install, sell, offer for sale, or adver— tise, or, except in an application to the board for accreditation of a device, represent, any device as a motor vehicle pollution control device for use on any used motor vehicle unless that device has been accredited by the board. fNo person shall sell, offer for sale, adver— tise, or represent any motor vehicle pollution control device as an accredited device which, in fact, is not an accredited device. Any violation of this subdivision is a misdemeanor." Any apparent violation of the conditions of this Executive Order will be sub— mitted to the Attorney General of California for such action as he deems advisable. Executed at Sacramento, California, this [fz day of April, 1974. WILLIAM SIMMONS Executive Officer

State of California — AIR RESOURCES BOARD April 11 , 1974 Staff Report Evaluation of the NC Industries "G.R. Valve" for Exemption from the Prohibitions of Section 27156 of the Motor Vehicle Code Introduction NC Industries of Newbury Park, California, has applied for exemption from the prohibitions of Section 27156 of the Vehicle Code for its "G.R. Valve". This section prohibits the installation of any device which may reduce the effectiveness of the motor vehicle emission control system. The applicant is requesting the exemption be granted for all 1974 model—year vehicles and older with the exception of Volkswagen, diesel, fuel injection, or supercharged engine vehicles. II. System Description and Function The "G.R. Valve" is a T—shaped air bleed type valve installed in the line connecting the positive crankcase ventilation valve and the intake manifold. The check ball is positioned on a spring intalled inside the valve body in a normally open position. At high engine vacuum (deceleration, low cruise, and idle operating modes) the ball compreses the spring and closes the vaive to prevent additional air from entering the intake manifold. At low engine vacuum (wide open throttle or heavy acceleration) the spring fully supports the ball to keep the valve open allowing additional air to enter the intake manifold. The valve is also open when the engine is not operating. w ummegnn on en nmemm miugeg mtemar

G. R. Valve III. System Evaluation \ A. Applicant‘s Data The applicant submitted Olson Laboratories, Inc., report # 8750—5101 on the NC Industries air injection devfce dated February 28, 1974. The report contains exhaust emission data obtained from the following vehicles. 1. 1972 Ford LTD (#167553) 2. 1966 Pontiac Lemans (#23717). The applicant could not provide any specific description of the vehicles such as, engine size, carburetion, transmission, etc. The following table summarizes the data obtained. Federal Hot CVS Exhaust Emissions in gm/mi _ hC CO NOx 1972 Ford Baseline 1.35 27 .86 4.07 (#167553) Device 2.05 26 .65 3.91 % Change 51.9 —4 .4 —4.0 1966 Pontiac _ Baseline 3.29 53.16 5.37 (#23717) Device 3.09 40.11 5.44 % Change —6.1 —24.6 1.3 In addition, a 50 MPH steady state test was performed with another 1966 Pontiac Lemans (#560200). The datavsubmitted from this test were inconclusive.

G. R. Valve The applicant submitted several other reports which were also considered inconclusive by the staff as the California or Federal test procedures were not used or NOx emission test data were not included,. Except for the 51.9% increase in hydrocarbon emissions from the 1972 Ford over the baseling readings, the rest of the data were typical and similar to data previously acquired by the ARB when testing similar devices. These data generally ShOW no adverse effects on the vehicles existing emission control system. ARB Testing 1. Emission Tests The 51.9% increase in hydrocarbons noted in the 1972 Ford LTD tested by.OTson Laboratories required further investigation due to the apparent inconsistency in HC and CO emission values. The applicant agreed to submit the 1972 Ford LTD to the ARB for retesting. The vehicle is identified as; 1972 Ford LTD, 400 CID, 2 bbl. carb., auto. trans., license # 384 GVZ. + Upon inspection it was found that this vehicle was not adjusted to manufacturer settings which could account for the applicants data discrepancy. The vehicle was adjusted and checked before performing a hot CVS test. The hot CVS test was run on the vehicle with the following results:

1972 Ford LTD (384 CVZ) Federal Hot CVS Exhaust Emissions in gm/mi Saseline 1.16 . 7 .02 3. 78 Jevice 1.27 7.1 3.70 % Change 9.5 1.6 —2.2 An evaluation of the above data indicates that the vehicle tested had extremely lean carburetion and hence, is not representative of this particular make of vehicle. ilith this lean carburetion only a small change in hydrocarbon mass emissions occured. Consequently, a more representative vehicle was choosen in order to resolve the effect of the R. valve on hydrocarbon emissions. The vehicle was & o 23 1974 Pinto, 2300 cc, auto. trans., lHicense # 255 KJC. Three not CVS back—to—back tests were performed. The average results were as follows: 1974 Pinto (225 KJC) Federal Hot CVS Exhaust Emissions in gm/mi Baseline 0.73 20.16 1.11 Jevice — .0.73 19.59 1.13 % Change ‘ 0.0 —2.8 1.8

Based upon the available data, 1t is found that the G. R. O vaive does not adversely effect a vehicle‘s existing emission Do The ARS performed a bench flow test with two of the 6. &. value w supplied. These tests measured the air bleed rate by varying the vacuum downstream from the valve with one of the finlet ports losed. The ranges of vacuum usec in the tests are those experienced during normal engine operation. in the he meximum flow rates of 2.6 to 3.3 CF! were observed wher the a vacuum varied between 0 inches to & inches Hg. Under no road load, vehicles operate in this vacuum rarge fo The staff considers the volume of air that . valve into the intake manifold during icant. No flow rates were observed can ~h 23 5 C «s 13 in — w when the vacuum exceeded 4 inches Hg (Refe 1 btained show that the device me 62 ct m @ 0 $ Aai+ 4s ablished by th ARZ for all engine sizes. > Criveria eS c+ o Conclusion and Recommendation The staff recommends that the air bleed valve labeled "G. R. YValve manufactured by NC Inéustrags, Newbury Park, California, should be cranted an exemption from the prohibitions of Section 27156 for 1974 and olider model year vehicles with the exception of Volkswagen, diesel, fuel injection, or supercharged engine vehicles.

Bench Flow Test * "G_R. Yalve" 4 7 3 . B E -g 2 . / Increasing or decreasing vacuum w ____ Increase in vacuum {r j |,__— PDecrease in vacuum . 0.0 . 4 8 12 16 20 24 a . Manifold Yacuum in. of Es .- . Figure I — first G.R. Valve 4 . 3 & &3 i < § 2 TIncressing or decreasing vacuum a Increase in vacuum 1 Becrease in vacuum 0.0: — 8 12 . 16 20 24 Meanifold Vacuum in. of Hg Figure 2 — Second G.R,. Valve se


Document Created: 2005-09-01 12:42:35
Document Modified: 2005-09-01 12:42:35

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