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fG M R E S T R I C T E D

Circulation of this report is restricted to executives and engineering groups of General Motors

STOCK ENGINE

TESTA Pub lication of the Automotive Engine Test Code Subcommittee

1969 CHEVROLET327 CU. IN. V-8

General Motors Engineering Staff

General Motors Technical Center, Warren, Michigan 48090

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Report No. 74.492.38 July 2, 1969

Engineering Staff General Motors Corporation

GM Technical Center Warren, Michigan

STOCK TEST

OF

1969 CHEVROLET

327 CUBIC INCH V-8 ENG INE

Compiled by:

O. M. Smit

Approved by:

in R. Stone Assistant Engineer in Charge Test Department

Approved by:

/ ■/' ; ii( A . ' '/ I. ■ . • : . ,W . P. Ransom -Engineer in Charge Test Department

Report No. 74.492.38

TABLE OF CONTENTS

Page

Foreword - - - - - - - - - - - - - - - - - - - - - - - 1

Conclusions - - - - - - - - - - - - - - - - - - - - - - 2

Descriptions and Methods - - - - - - - - - - - - - - - - - 5

Engine Illustrations - - - - - - - - - - - - - - - - - - - 8

General Information - - - - - - - - - - - - - - - - - - - 10

CURVE SHEETS

Valve Lift Diagram - - - - - - - - - - - - - - - - - - - 11

Motoring Compression - - - - - - - - - - - - - - - - - - 12

Gross Engine Horsepower - - - - - - - - - - - - - - - - - 13

Maximum Power and Detonation - - - - - - - - - - - - - - - 14

Full Throttle as Installed- - - - - - - - - - - - - - - - - - 16

Maximum Power & Spark Timing Sensitivity/Non-Knocking Fuel - - - 18

Volumetric Efficiency - - - - - - - - - - - - - - - - - - 20

Heat Distribution - - - - - - - - - - - - - - - - - - - - 22

Economy at Fractional Loads - - - - - - - - - - - - - - - - 24

Carburetor Flow Curve - - - - - - - - - - - - - - - - - - 34

FOREWORD

As pari- of the Stock Engine Test Program, a 1969 Chevrolet

327 cubic inch, 235 horsepower engine as used in the Impala

four-door sedan with the optional two-speed Powerglide auto

matic transmission, was tested in the Engineering Staff Test

Department at the General Motors Technical Center.

The engine was received from production and given a fifty-hour

break-in. Before running Test 12, 20, and 18, the combustion

chambers were cleaned and the valves lapped.

The procedure outlined in the General Motors Engine Test

Code, 5th Edition, was followed throughout the test.

CONCLUSIONS

Main points of interst of the various tests are noted here: Continued

AS INSTALLED POWER (TEST 1)

Maximum BHP 150.1 @ 4000 RPMMaximum BMEP 121.6 PS I @ 2200 RPMMaximum Brake Torque 263.3 Lb.Ft. @ 2200 RPMMinimum Brake Specific Fuel 0.503 Lbs.BHP/Hr. @ 2800 RPM

MAXIMUM POWER AND DETONATION (TEST 7)

Maximum BHP 201 .4 @ 4800 RPMMaximum BMEP 139.3 PSI @ 2400 RPMMaximum Brake Torque 301 .7 Lb. Ft. @ 2400 RPMMaximum MechanicaI Efficiency 90.9 % @ 1200 RPMMinimum Brake Specific Fuel 0.427 Lbs./BHP-Hr. @ 3000 RPM

MOTORING FRICTION (TEST 11)

Friction HP 4.1 @ 800 RPM26.6 @ 3000 RPM73.7 @ 5200 RPM

Friction MEP 12.5 PSI @ 800 RPM21.5 PSI @ 3000 RPM34.4 PSI @ 5200 RPM

GROSS ENGINE HORSEPOWER (TEST 20)

Maximum BHP 232.9 @ 5000 RPMMaximum Brake Torque 333.0 Lb. Ft. @ 2600 RPM

VOLUMETRIC EFFICIENCY AS INSTALLED (TEST 10)

Maximum Volumetric Efficiency Minimum Brake Specific Dry Air Air Fuel Ratio

79.5 % @ 2400 RPM6.45 Lbs./BHP-Hr. @ 18 & 2000 RPM

13.1 @ 800 RPM11 .9 @ 1400 RPM12.3 @ 2400 RPM13.3 @ 3400 RPM13.0 @ 4400 RPM

_ 2 -

VOLUMETRIC EFFICIENCY, MAXIMUM POWER (TEST 10A)

M ain points of interest of the various tests are noted here: Continued

Maximum Volumetric Efficiency Minimum Brake Specific Dry Air Air Fuel Ratio

82.6 %5.74 Lbs./BHP-Hr.

12.712.713.413.213.1

2400 RPM 2000 RPM 800 RPM

2200 RPM 3200 RPM 4200 RPM 5200 RPM

HEAT DISTRIBUTION (TEST 9)

Maximum Thermal Efficiency Minimum Specific Heat Rejection Percent Heat in Friction HP

Water Circulation Through Engine

26.428.8

3.35.8

11.18 .8

35.9 57.3

%BTU/BHP-Min.

Gal ./Min. Gal ./Min. Gal ./Min.

2800 RPM 2400 RPM 800 RPM

2800 RPM 4400 RPM 800 RPM

2800 RPM 4400 RPM

MOTORING COMPRESSION (TEST 12)

Average Corrected Compression Pressure 237.4 PSI280.0 PSI252.0 PSI

800 RPM 3200 RPM 5000 RPM

- 3 -

Main points of interest of the various tests are noted here: Continued

ECONOMY AT FRACTIONAL LOADS (TEST 18)

Road Load Fuel Economy 20.4 MPG25.4 MPG25.0 MPG22.1 MPG19.2 MPG17.4 MPG14.8 MPG12.1 MPG10.2 MPG8.4 MPG

800 RPM 1200 RPM 1600 RPM 2000 RPM 2400 RPM 2800 RPM 3200 RPM 3600 RPM 4000 RPM 4400 RPM

_ 4 _

DESCRIPTION AND METHODS

ENGINE

The engine was set up with carburetor level, simulating car installation. Engine to dynamometer connection was made by a Spicer universal joint propeller shaft, containing rubber grommets for torsional flexibility.

On Standard Test No. 20 the air cleaner was removed and fuel requirements for maximum power were obtained by controlling the carburetor bowl pressure.

PRESSURES

Water and mercury manometers were used for intake, exhaust, and carburetor pressures. Oil pressure was obtained with a Bourdon type gage. Compression pressures were measured with a balanced diaphragm transducer. Atmospheric pressure was measured at a central location in the Dynamometer Laboratory.Vapor pressures were taken in the test cell by means of a hygrometer.

TEMPERATURES

Carburetor air, fuel-air mixture, o il, water, and fuel temperatures were measured with the thermocouples and a Brown self-balancing potentiometer for all tests except heat rejection. A thermopile calibrated at Research Laboratories was used to measure the temperature rise through the engine for the heat distribution test.

Average mixture temperature was obtained from thermocouples in the eight manifold legs, approximately one inch from the ports. Water-in and water-out temperatures were taken as close as possible to the engine. A Harrison heat exchanger was used to control water temperature.

FUEL

Fuel consumption was measured by a General Motors Research Automatic Burette System. Fleetwing 110/130 was used for Test 6A; Indolene 30 for Test 18; and American Regular was used for all other tests. An analysis of American Regular by the Chemistry Department of General Motors Research Laboratories is as follows:

- 5 -

Paraffins, % 54.0Olefins, % 23.0Aromatics, % 23.0Specific Gravity @ 60°F 0.7465Tetraethyl Lead, cc/Gal. 3.04Reid Vapor Pressure, Lbs. 10.0Gum, mg/100 ml. 10.0 (7.0 heptane wash)Sulphur, % .11Research Octane No. 95.0Motor Octane No. 84.0

Disti I lation, % °FInitial 8910 12220 14530 16740 19150 21460 23670 26080 28790 322End 390

Recovery, % 98Residue, % 0.7

SPARK ADVANCE

Spark advance was measured by a General Instruments and Engineering Company electronic spark protractor.

HEAT DISTRIBUTION

A turbine-type flowmeter and an electronic counter were used in the heat distribution test.

AIR CONSUMPTION

Air flow was obtained with an orifice type flowmeter.

- 6 -

TORQUE

A General Electric dynamometer and Toledo scales were used to measure torque.

FAN

Fan power was obtained by a free air test on a small dynamometer.

COMPRESSION RATIO

A sonic volume measuring unit was used to obtain clearance volume.

COMPUTATIONS

Calculations of test results were done by the 7094 IBM Computer in the Data Processing Department of General Motors Research Laboratories.

)- 7 -

1969 CHEVROLET 327 CU . IN . V-8

- 8 -

1969 CHEVROLET 327 CU„ IN . V-8

- 9 -

O M R 7S-A REV 5-61

LOG SHEET NO.___

d a t e 5/23/69GENERAL M O TO RS CORPORATION

ENGINE TEST LOG SHEET A—GENERAL INFORMATION

REPORT NO. 74.492.38PAGE NO. J_Q__________

OBJECT OF TEST Stock Fngine Test 1 9

e n g in e Chevrolet 1969 VI 202 FC8 4.00 In. STROKE 3.25 in. ,326.6 cu.in •SPECIFIED CR 9.0

ADVERTISED HP 235 @ 4800 RPM ADVERTISED TORQUE 325 lb.ft. @ 2800 RPMw h e r e o b t a in ed (d e s c r ib e c o n d it io n ) The engine wos obtQined from production ond given Q

50 hour break-in.VALVES HEAD DIAM SEAT ANGLE MAX LIFT LASH

HOT COLD

INTAKE 1 .74 in. -iv

Ul o .385 in. Hyd

EXHAUST 1 .52 in. 45° .4093 in. Hyda r r a n g e m e n t a n d d e s c r ip t io n Overhead, one each per cylinder

ROCKER ARM RATIO, INTAKE 1 .50 EXHAUST 1 .51CAMSHAFT (STD. EXP. PT NO.) Standardc y l in d e r head (s t d . e x p . pt n o ., t y p e ) Standard, valve-in-head

CYL NO. 1 2 3 4 5 6 7 8 AVG

COMP RATIO 9.44 9.11 9.27 9.11 9.35 9.06 9.12 9.27 9.22man i fo ld s (s t d . e x p . p t no ., l e g s , t y p e ), ex h a u s t Standa r d, 4 I eg s eac h

in ta k e Standard area le g s 2.042 sq.in. a re a header(L )2 .57,(R)2.64 AREA RISER 2.35 sq. i n.HEAT CONTROL (DESCRIBE)

c a rb u r etion (s t d . e x p . m a k e , m o d e l , t y p e ) Standard/ Rochester, 2 GV, 2 b b l . , mean limit a ir c l e a n e r (m a k e , t y p e ) Standard, pa per e le m e n tru E L p u m p ( m <k e . p t n o .) — ___________________________

p istons (st d . e x p . p t n o ., m t l .) Standard, Cast aluminum alloy_____________________________r in g s (no . t y p e ) 2 compression and 1 oil above pin

EXHAUST SYSTEM. PIPE(S) (OP. LENGTH) Single INTERMED PIPE(S) (OP. LENGTH)

m u f f l e r (s ) (m a k e , t y p e , o p . l e n g t h ) Reverse flow, 20.5 in. long, 9.5 in wide, 5.0 in. higFTRESONATOR(S) (TYPE. OP. LENGTH) --------------- t a il p ip e (s ) (o p . l e n g t h ) 1 .8 in. OD, 62.0 in. long

ELECTRICAL SYSTEM GENERATOR (MAKE. MOD, PT NO-. DRIVE RATIO. NOMINAL VOLTAGE) Del CO ReiTiy

1100834 , 2.46:1: 12 volt _______ COIL (PT NO. ) ________________

VOLTAGE REGULATOR (MAKE. PT NO.. SETTING. MODEL) --------

d is t r ib u t o r (m a k e , m o d , pt n o .) DelcoRemy, 1 1 1 1483 ___ _______ ____SPARK PLUGS (MAKE. MOD. DIAM. REACH. GAP) AC/ 42S, 14MM, 3/8 in., .035 in._____FIRING ORDER IL f BR / 4R # 3L / 6R / 51, 7L , 2R________ BREAKER CLEARANCE .019 in.t v p e s p a r k coNTROL CentrifugQ^Y & vacuum INITIAL AUTO SETTING 2° BTDC @600 RPM

C O O LIN G SYSTEM FAN (DIAM, PITCH. NO. BLADES. DRIVE RATIO) _]_7.6_?n._t 30° blade angle, 4@ 74.5 ° and 105.5 °; .95:1 Z I ~ _______ ________FUEL COMM L NAME American Regular .7465 OCTANE NO. 95 84OIL COMM L NAME Havoline 30TEST WEIGHT 3770 + 600 - 4370 lbs. FRONTAL AREA 24.4 Sq . ft.N/V RATI O 38.65 AXLE RATIO 3.08 ENGINE INSTALLATION ANGLE

ENGINE WEIGHT (AS IN STALLED, D RY. LESS F LYWHEEL) 529 lbs.TYPE TRANSMISSION Powerg I ide

NOTES (GENERAL OPERATION. TEST SETTINGS. ETC.) _______________________________________________________

* Butterfly valve in right exhaust manifold controlled with Eu-metal sprfng and air cleanerinlet temperature controlled by a thermostat and engine vacuum.

** Right branch, 2.0 in. OD, 35.0 in. long, left branch, 2.0 in. OD, 6.0 in. long; main pipe,2.0 in. OD, 81 .0 in. long._______________________________

RECORDED BY. W. Douglas & J . Rennell

CRAN

KSH

AFT

D

EG

REES

ENGINE Chevrolet 327 cubic inch MOD. & SERIAL NO. 1 969 VI-202-FC

CAMSHAFT NO.TEST DATE 4/30/69

VALVE LIFT DIAGRAMS

74.492.38

ENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 12MOD - SERIAL NO 19G9 VI 202 EC TEST DATE 5-5-69

„ REPORT NO 74.492.39

LB-F

T

ENGINE PERFORMANCE RPM GROSS ENGINE HORSEPOWERENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 20MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-20-69

„ REPORT NO 74.492.38

DEGREES

F

ENGINE PERFORMANCE RPM MAXIMUM POWER AND DETONATIONENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 7MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-21-69

REPORT NO 74. 492.38

IN HG

X 10

LB/H

P-HR

X 100

PSI

LB-F

T

ENGINE PERFORMANCE RPM MAXIMUM POWER AND DETONATIONENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 7MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-21-69

1C REPORT NO 7I4.U92.38

PERCENT

LB/H

R

IN-HG

X 10

DEGREES

F

ENGINE PERFORMANCE RPM FULL THROTTLE AS INSTALLEDENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 1MOD - SERIAL NO 1969 VI 202 FC TEST DATE 4-22-69

,, REPORT NO 74.492.38

IN HG

X 10

iftjgjgjcd FBNj ^

800 1600 2400 3200 4000ENGINE PERFORMANCE RPM

ENGINE CHEVROLET 327 Cl MOD - SERIAL NO 1969 VI 202 FC

4800 5600 6400

FULL THROTTLE AS INSTALLED OBJECT-STANDARD TEST 1 TEST DATE 4-22-69

REPORT NO 74.492.38

LB/H

R

DEGREES

F

ENGINE PERFORMANCE RPM MAXIMUM POWER AND SPARK TIMING SENS.ENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 6AMOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-6-69

lfl REPORT NO 74.492.39

IN HG

X 10

LB/H

R

300

280

260

240

220

200

180

160

140

120

100

3 0

50

10

>0

)JENS

3 9

800 1600 2400 3200 4000ENGINE PERFORMANCE RPM

ENGINE CHEVROLET 327 Cl MOD - SERIAL NO 1969 VI 202 FC

- 19-

4800 5600 6400MAXIMUM POWER AND SPARK TIMING S OBJECT-STANOARO TEST 6A TEST DATE 5-6-69

REPORT NO 74.492.

RIR

LB/HP-

HR

X 10

CFM

ENGINE PERF0RMRNCE RPM VOL. EFF. RS INSTALLEDENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 10MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-13-69

, 9n REPORT NO 74.492.38

LB/HR

PERCENT

RATIO

X 10

AIR

LB/H

P-HR

X

10 CF

M

ENGINE PERFORMANCE RPM VOL. EFF. MAX. POWERENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 10AMOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-13-69

REPORT NO 74.492.39

LB/HR

PERCENT

RATIO

X 10

GAL/

MIN

ENGINE PERFORMANCE RPMENGINE CHEVROLET 327 Cl MOD - SERIAL NO 1969 VI 202 FC

- 22-

HEAT DISTRIBUTION OBJECT-STANDARD TEST 9 TEST DATE 5-14-69

REPORT NO 74.492.39

DEGREES

F PE

RCENT

BTU/

HP-M

IN

BTU/

MIN/

100

LB/H

P-HR

X 100

DEGREES

F

600

560

520

1480

14140

400

360

320

300

800 1600 2400 3200 4000

ENGINE PERFORMANCE RPMENGINE CHEVROLET 327 Cl MOD - SERIAL NO 1969 VI 202 FC

- 23-

4800 5600 6400HEAT DISTRIBUTION OBJECT-STANDARD TEST 9 TEST DATE 5-14-69

REPORT NO 74.492.39

LB/H

R

0 10 20 30 40 50 60 70 80 90 100PART LOAD TEST PER CENT ECONOMY AT FRACTIONAL LOADS

ENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 18MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-27-69

.24. REPORT NO 74.492. 38

300

0 10 20 30 40 50 60 70 80 90 100PART LORD TEST PER CENT ECONOMY AT FRACTIONAL LOADS


25. REPORT NO 74.492. 38

300

0 10 20 30 40 50 60 70 80 90 100PART LORD TEST PER CENT ECONOMT RT FRACTIONAL LOADS


REPORT NO 74.492.- 26-

38



-27- REPORT NO 74.492.38

600(90— 300

0 10 20 30 40 50 60 70 80 90 100PART LOAD TEST PER CENT EC0N0MT AT FRACTIONAL LOADS


REPORT NO 74.492. 38

300



29 REPORT NO 74.492. 38

RATIO

X 10

DEGREES

F LB/HP-HR

X 100

IN HG

X 10

CFM

LB FT

MPG

X 10

600 300

1180



30 REPORT NO 74.492. 38



.3,_ REPORT NO 74.492.38

600(90-

PflRT LOAD TEST PER CENT ECONOMY AT FRACTIONAL LOADSENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 18MOO - SERIAL NO 1969 VI 202 FC TEST OATE 5-27-69

REPORT NO 74.492.38

30.1 IN .-HG.R F.XH PRFSS.6 0 0 i 9 f r

I ! MLILF IF! IN HG- I-L13

[-480

PART LOAD TEST PER CENT ECONOMY AT FRACTIONAL LOADSENGINE CHEVROLET 327 Cl OBJECT-STANDARD TEST 18MOD - SERIAL NO 1969 VI 202 FC TEST DATE 5-27-69

33 REPORT NO 74.492.38

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