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iir J. S. bintringhaa
Datroit
J. A. Gipolla
Detroit
Engine Deposition
July 14, IMS
File Hi 7G1-RDR6
In Teat 7G1-R0RG of the recent antiknock compound comparison at the Red Star Fleet, one vehicle which operated on G2 Mix "Ethyl" antiknock compound was studied carefully with regard to deposition. The vehicle in question was powered by a 1947 Dodge T-120 engine In heavy-duty truck operation for a total of 58,343 alias. The fuel was Standard Oil
(Indiana) Hod Crown Rouge base stock plus 3.0 rol/gal TEL. The lubricant was Socony-Yaovaaa RD8-197, 3AJ5 30.
The question behind tills brief additional study was the manner in
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which lead scavenging is accomplished in this type of operation. It had been known tlsat the amount of lead, bromine, and chlorine not ex
hausted from an engine and remaining either in combustion chamber or
exhaust vnlva deposits represented a very small amount of the total
input. In 100-hour dynamometer tests under heavy-duty cycling operat
ing conditions in a 1342 Plymouth P-14 engine, lead deposits in the
ooabustion chambera represented about 3.5 percent of total lead input,
Head deposits d>n the exhaust valves represented about 0.5 percent of
total lead input. It was further realised that these percentage values
would decrease after longer periods of engine operation. Lead deposition
beyond the exhaust valve was also an item of concern in more fully under-
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standing the mechanism of lead scavenging.
During 38,343 miles of vehicle operation, 6,366 gallons of fuel were consumed by the engine. This amount of fuel contained}
19,098 ml TEL 20,200 gm Fb
7, BOO gpt Br 6,920 gm Cl
The amount of lead, bromine, and chlorine remaining in deposits in the
;
engine and its exhaust system are shown as percent of input.
tu MULA ri V
lb
Sr
Cl
Jib-
Br cA
Combustion Chamber
'O."6o
onr
EOF o.to 0,1! 0 IS'
Exhaust Valves
0.16
0,00
0.00 o'
0- H o. iC-
Manifold
_ 1.93
0*36
0.13 i.n 0 47 0.17
Exhaust Pipe
....4.16
0.31
0.11
t*-is orn 0-19
Muffler
2.22
1.83
0.54
ZA l ... 0.93
J. S. winfcringhasa
- B&ge 3
July 14> 1343
so deposits are listed in order of the route of exhaust gas exit* The ta ere shown cumulatively on the attached figure. Total deposition Is
1# lead is 9 percent of input, bromine 2 percent, and chlorine 1 psrcent.
Saaveaging appears to deteriorate markedly just beyond the exhaust vslve, ohiorins showing an inferiority relative to bromine greater than that exhibited in the combustion chamber* Both halides tend to continue their exit without extricating lead in their passage through the exhaust manifold end the exhaust pipe* Muffler deposition indicates lead chloride present in an amount comparable to that in the combustion chamber, and lead bromide present in an amount considerably greater than that in the combustion chamber Temperatures encountered certainly affect these observations*
JAC/41
CCt Dr* 3. Calingaert Mr* R Y. Kerley Mr* ft* G. Lovell Mr. J. B* Macauley
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DISTRIBUTION OF LEAD, BROMINE, AND CHLORINE IN EXHAUST SYSTEM DEPOSITS
1947 Dodge T-120 Engine Operated 38,346 miles on Standard Oil (ind.) Red Crown Base plus 3.0 ml/gal TEL as 62 Mix. Lubricant - Socony-Vacuum RD8-197, SAE 30-
DEPOSIT LXATIGN