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CODIt 9 March
DCFf. fXANT/Ornce
TO • NAM* DIVI3ION ProcLPlannin
P. E. Pclderficld 17A0 ft Development Staff 1i4n pp rk
fllOM • NAM* PCTT, DIVISION ruAMT/utrics
I P. Lindsay A33O ■J5nrJ.nagrJar..Q££lii£ !H,»hlnnd Park
•ua/ccn fecpcsed chassis dynamometer wind tunnel for engine
COOLING SYSTEM DEVELOPMENT ' I t* i •
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Chrysler Corporation opcndo in tho neighborhood of C?5 million
annually for radiators plus tho coot of tho other engino cooling •,'»
system components. Thia amount could be,significantly reduced with 1 •
added facilities for improved test methods. Releases arc baaed
primarily on road testa run at the Proving Grounds. The test *
objectives in determining the release requirements are 1) to assure •
adequate cooling for the models most difficult to cool and 2) to ■■ •• ’’
meet cooling performance standards at minimum cost on models re
quiring loss than maximum capacity ^components. . - '
Tho objectives Just mentioned are not being satisfactorily
attained. Thero is no suitable faddAiry or method available for
properly testing engine cooling on air conditioned cars. This re
sults in high risk of either costly "over design" or serious field . •
complaints. [ »
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For cars where minimum cooling system co3t is the primary
objective, road testing to determine cooling system requirements is
less than adequate. Tho engine hoat rejection in each car tested
should be measured and rated to evaluate tho radiator capacity re
quirement. This cannot bo done presently. Ambiont temperature changes
require the application of correction factors which may be difficult ' . ’
to determine and of questionable accuracy. Other uncontrollable :
weather conditions result in test variations and inaccuracies. V<ith- •
out going into further detail,' releases based on road test must be •
made on a conservative basis at added cost to allow a "margin for
error" relative to cooling standards. It should also be added that
tho development of roalistic cooling standards for maximum cost
savings is dependent upon establishing accurato knowledge of-pro
duction car cooling performance levols.
Importance to tho company of adequate engine cooling development
cannot bo minimized when consideration it given to tho role played I «
in satisfactory car ojxjration,^ warranty <■: xpenso, styling limitations,
car aerodynamic problems, and no in/licatn d, tho economic implications
of high volumo production. .1' r
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