Page 1 - Combined_57_OCR

INTER COMPANY CORRESPONDENCE

TO - NAME DEPT. DIVISION PLANT/OFFICE
H. P„ Bruns 7590 Engineering Highland Park
FROM NAME DEPT. DIVISION PLANT/OFF1CE
Ge Ma Kaliace 8940 Engineering Highland Park

SUBJECT?
PERFORMANCE OF 1969 DODGE CHARGER 500
AT DAYTONA INTERNATIONAL SPEEDVZAY

Summary;

cn result of the testing of the 1969 Dodge Charger 500 race
car (car #046) at the 'Daytona I nternational Speedway with a limited
amount of instrumentation, a gr eat deal has been learned about the
ctual behavior of a race car a t Daytona. Based on this data the
erformance of the car as tested seems to be in line with what would
be expected for the known eng in e output and aerodynamic drag of the
car* The at Q sheets and the discussion go into the aetde
toched cur
performance or the car in detai 1.
Results:

From September 23 rt 0 26 1968 the Dodge Chargor 500 Engineering
test car (car #046) -vc [ft rr 0 1 ft :t) d at the Daytona International Speedway.
The driver was Buddy B The test program was limited from the
ako
original schedule due to <cons •H c o (0 ble rain * The nichest lap speed
actually obtained was 186 a 18 mob., which wa (ft considerab W lower than
had been expected. Th e speed however is not us slow compared to
Fora seeds as would • . ? ar imti all * Q er #046 .r_ s running with
s i ng1e 4-bb1. c arbur tor * o a wi ncly ay ■ 3nd on worn Firestone 4th
of July type tires, a For J j July race th( 3 fastest qualifier using
th'■ s e Fir- ~ st oir 11 re G ) a) Cale Yarborough , who qualified at 185.75
mbh, with n- w tire two 4-bbl. carburetors and with very little-
wind. The fastest Chryslet product was Charlie Glot-bach in c. 1968
Charg 3 H with Goodyear tir-^s and two 4-bbl. carbure tors. The fastest
quail f i < r at 187*05 mph* was Lee Roy Yarbrough in a Mercury with
C O D a ear tires. The Goodyear tire were about one mph. faster than
H 4C O O £ j ( t f H- K (T 0 [ft O ' tones for qualifying, and new tires are requently worth at
FT*
t much ov
ft
^
will -also slow the or worn tires, The wind during the September test
car down. but no value can be
ssigned to it.
The (ft ingle c a rburetor reduc - the newer of our eng in? by at least
25 HP, zhich is u sneed loss of at least one mph Overall it would
J
a op a O that th Cl_______ 50C is 3 to 4 mob... faster than the 1968
t least ~
Charger, and a to mpha f aster than the 1968 Mercury,
Silowing for a single ce rburetor on the 1963 Ford engine. Such in-
direct comp ar1 sons shoul 1 be used ■p ith considerabl e caution however
rn ince they can H* k/* I rt O Hi Q ! I — • se T sumptions
Discussion:

ests
During the September Daytona t 0 ft wo chann el ush recorder
was mounted in the car for most of the run ■; record ing engine speed
and either manifold vacuum n O ar yaw angl e o The mt. anifold vacuum
tra ce showed that the driv G ) H Q ally did us­ e KOT for the complete’lap
o c he stated« Most of the testing was the ore run with the yaw
met er* The yaw meter mean ures the. yaw angle of the car relative to