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Hupmobile 1930s General Specs
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Year Prod
Total		 Model
Designation		 Wheel
base
Inches		 Valve
Location		 Bore
and
Stroke		 Piston
Dis
place
ment
Cubic
Inches		 Com
pres
sion
Ratio
(Stan
dard)		 Maximum
Brake
H.P.
@
R.P.M.		 Spark
Plug
Size		 Spark
Plug
Gap		 Point
Gap		 Dwell
Angle		 Firing
Order		 Ignition
Timing
BTDC
or
Mark		 Grnd
+/-
Volts
1930 22,183 Century Six S 114 In Block 3 1/4 x 4 1/4 211.5 4.85 70 @ 3200 18mm .025-.028 .015-.018 41 153624 DC1 +6
Century Eight L 118 In Block 2 7/8 x 4 5/8 240.2 5.20 90 @ 3400 18mm .028-.030 .020 34.5 14738526 2.25" +6
Standard Eight C 121 In Block 3 x 4 3/4 268.6 5.20 100 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Standard Eight H 125 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Standard Eight U 137 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
1931 17,451 Century Six S 114 In Block 3 1/4 x 4 1/4 211.5 4.85 70 @ 3200 18mm .025-.028 .015-.018 41 153624 DC1 +6
Century Eight L 118 In Block 2 7/8 x 4 5/8 240.2 5.20 90 @ 3400 18mm .028-.030 .020 34.5 14738526 2.25" +6
Standard Eight C 121 In Block 3 x 4 3/4 268.6 5.20 100 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Standard Eight H 125 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Standard Eight U 137 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
1932 10,467 Six 1st Series 214 114 In Block 3 1/4 x 4 1/4 211.5 4.85 70 @ 3200 18mm .025-.028 .015-.018 41 153624 DC1 +6
Six 2nd Series 216 116 In Block 3 3/8 x 4 1/4 228.0 5.00 75 @ 3200 18mm .028-.030 .015-.018 41 153624 DC1 +6
Eight 1st Series 218 118 In Block 2 7/8 x 4 5/8 240.2 5.20 90 @ 3400 18mm .028-.030 .020 34.5 14738526 2.25" +6
Eight 1st Series 221 121 In Block 3 x 4 3/4 268.6 5.20 100 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Eight 2nd Series 222 122 In Block 2 15/16 x 4 5/8 250.7 5.40 93 @ 3500 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Eight 1st Series 225 125 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Eight 2nd Series 226 126 In Block 3 1/16 x 4 3/4 279.9 5.48 103 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
Eight 1st Series 237 137 In Block 3 1/2 x 4 3/4 365.6 5.20 133 @ 3600 18mm .028-.030 .020 34.5 14738526 1-8 Mark +6
1933 7,316 Six 316 116 In Block 3 3/8 x 4 1/4 228.0 5.75 90 @ 3400 18mm .028-.030 .015-.018 41 153624 DC1 +6
Six 321 121 In Block 3 3/8 x 4 1/4 228.0 5.75 90 @ 3400 18mm .026-.030 .015-.018 41 153624 DC1 +6
Six 321A 121 In Block 3 3/8 x 4 1/4 228.0 5.75 90 @ 3400 18mm .026-.030 .015-.018 41 153624 DC1 +6
Eight 322 122 In Block 3 x 4 5/8 261.5 5.47 96 @ 3500 18mm .026-.030 .020 34.5 14738526 1-8 Mark +6
Eight 326 126 In Block 3 3/16 x 4 3/4 303.2 5.34 109 @ 3600 18mm .026-.030 .020 34.5 14738526 1-8 Mark +6
1934 9,420 Six 417W 117 In Block 3 1/2 x 3 7/8 224.0 5.75 80 @ 3400 18mm .026-.030 .015-.018 34 153624 DC1 +6
Six 421A 121 In Block 3 1/2 x 3 7/8 224.0 5.75 90 @ 3400 18mm .026-.030 .015-.018 41 153624 DC1 +6
Six 421 121 In Block 3 3/8 x 4 1/4 228.1 5.75 90 @ 3400 18mm .026-.030 .015-.018 41 153624 DC1 +6
Six 421J 121 In Block 3 1/2 x 4 1/4 245.3 5.75 93 @ 3500 18mm .026-.030 .015-.018 41 153624 DC1 +6
Eight 422 122 In Block 3 x 4 5/8 261.5 5.47 96 @ 3500 18mm .026-.030 .020 34.5 14738526 1-8 Mark +6
Eight 426 126 In Block 3 3/16 x 4 3/4 303.2 5.34 109 @ 3600 18mm .026-.030 .020 34.5 14738526 1-8 Mark +6
Eight 427T 127 In Block 3 3/16 x 4 3/4 303.2 5.80 115 @ 3500 18mm .026-.030 .020 27.5 14738526 25/32" +6
1935 9,346 Six 517W   In Block 3 1/2 x 3 7/8 224.0 5.75 80 @ 3400 18mm .026-.030 .015-.018 34 153624 DC1 +6
Six 518D 118 In Block 3 1/2 x 4 1/4 245.3 5.75 91 @ 3500 18mm .026-.030 .015-.018 34 153624 DC1 +6
Six 521J 121 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .026-.030 .015-.018 41 153624 DC1 +6
Eight 521-O   In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .026-.030 .020 27.5 14738526 25/32" +6
Eight 527T 127 1/2 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .026-.030 .020 27.5 14738526 25/32" +6
1936 74 Six 618D 118 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .026-.030 .015-.018 34 153624 DC1 +6
Six 618G 118 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .026-.030 .015-.018 34 153624 DC1 +6
Eight 621N 121 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .026-.030 .017 27.5 14738526 25/32" +6
Eight 621-O 121 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .026-.030 .017 27.5 14738526 25/32" +6
1937 875 Six 618G 118 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .026-.030 .015-.018 34 153624 DC1 +6
Eight 621N 121 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .026-.030 .017 27.5 14738526 25/32" +6
1938 1,890 Six 822E 122 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .028 .020 40 153624 TDC +6
Eight 825H 125 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3600 18mm .028 .017 27.5 14738526 25/32" +6
1939 1,231 Skylark 6 915R 115 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .028 .020 35 153624 TDC +6
Six 622E 122 In Block 3 1/2 x 4 1/4 245.3 5.75 101 @ 3600 18mm .028 .020 40 153624 TDC +6
Eight 925H 125 In Block 3 3/16 x 4 3/4 303.2 5.80 120 @ 3500 18mm .028 .017 27.5 14738526 25/32" +6

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G. McDowell
carnut@carnut.com
est. 1996