engine conpression

[doughboywoodmike]

hello again

does anyone have an idea of the real conpresion of a 36 dictator 3a 6 cylinder...


thanks mike[8D][8D]

http://i219.photobucket.com/albums/cc115/doughboywoodmike/HPIM0572.jpg

[LarkVIII]

It's a low compression engine,about 6.3 to 1.

63VY4 Leakin' Lena Hagerstown MD

[doughboywoodmike]

what is that in pounds

http://i219.photobucket.com/albums/cc115/doughboywoodmike/HPIM0572.jpg

[DEEPNHOCK]

Here's some slightly later spec's, but most of them should be similar...
source: http://www.secondchancegarage.com/public/445.cfm
ENGINE SPECS

1947 Studebaker 226 Six Engine Specs
GENERAL SPECIFICATIONS
Model Designation: Commander 6: 14A
Wheel base: 119 (on Land Cruisers, 123")
Valve Location: In block
Bore and Stroke: 3-5/16 x 4-3/8
Piston displacement, Cubic Inches: 226.6
Compression ratio: 6.50
Maximum Brake Horsepower: 94 @ 3600 RPM
Maximum Torque Lbs.Ft. @ RPM: 176 @ 1600 RPM
Normal Oil Pressure Pounds: 40
TUNE UP SPECIFICATIONS
Spark Plug Make: Champion J9
Spark Plug Gap, Inch: .025
Firing Order: 153624
Ignition Timing: IGN on Vib. Damp.
Engine Idle Speed, RPM: 500
Cylinder Head Torque Lbs.Ft.: 83
Compression Pressure & Cranking Speed: 105 Min.
Voltage & Polarity: 6 volts, positive ground
PISTON AND RING SPECIFICATIONS
Fitting Pistons with Scale:
Shim Thickness to use: .002 (1 inch wide feeler);
Pounds Pull on Scale:: 15 to 20
Ring End Gap: (Fit rings in tapered bores for clearance shown in tightest portion of ring travel.)
Compression: .009
Oil: .009
Clearance in Groove: Compression: .002-.0025; Oil: .0015-.002
Wristpin Diameter, Inch: .8741-.8745
VALVE SPECIFICATIONS
Operating Clearance:
Intake: .016 Cold Exhaust: .016 Cold
Valve Seat Angle, degrees: 45
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 15 degrees BTDC
Exhaust Closes: 10 ATDC
Valve Spring Pressure Pounds at Inches Length:
Inner Spring: 54 @ 2-3/32
Valve Stem Clearance: Intake: .0015-.0035; Exhaust: .0015-.0035
Clearance for Timing Intake: .020
ENGINE BEARING SPECIFICATIONS
Connecting Rod Bearings:
Journal Diameter, Inches: 2.18675-2.18775
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .005-.009
Rod Bolt Tension: Lbs.Ft.: 50-55
Main Bearings:
Journal Diameter, Inches: 2.4995-2.5000
Bearing clearance: .0005-.0025
Shaft End Play: .003-.006 (Thrust on front bearing)
Main Bolt Tension: Lbs.Ft.: 90-95
CAPACITY DATA
Cooling System:
Without heater: 13 quarts
With heater: 14-1/2 quarts
Fuel Tank: 17 gallons
Engine Oil: 6 quarts
Transmission: w/out overdrive: 2-1/4 pint; with overdrive: 3
Rear Axle: 3 pints
AUTO-LITE DISTRIBUTOR SPECIFICATIONS
Distributor part number: 1GC-4802 (distributor rotates counter-clockwise when viewed from top)
Cam Angle, degrees: 39
Breaker Point opening, Inch: .020 (plus or minus .002)
Condenser Capacity: .20-.25 Mfds.
Breaker Arm Spring Tension: 17-21 Oz.
Centrifugal Advance: (degrees at RPM of distributor)
Advance starts: 1 degrees @ 500
Full Advance: 10 degrees @ 1400
Vacuum Advance Data (degrees @ In. of Mercury):
Advance starts: 1 @ 4
Full Advance: 6 @ 12
AUTO_LITE GENERATOR SPECIFICATIONS
Generator Number: GDZ-4804A, GDZ-4805A (generator rotates clockwise, 6 volts, positive ground)
Generator output: 35 amps @ 2000 RPM
Brush Spring Tension: 35-53 oz.
Field Current: 1.3 - 1.5 at 5 volts
AUTO-LITE REGULATOR SPECIFICATIONS
Regulator Number: VRP-6001A
Cutout Relay:
Voltage to close points: 6.5
Reverse Current to Open Points: 4-6 amps
Armature Air Gap: .031
Voltage Regulator Setting: 7.3 volts
Current Regulator Setting: 35 amps
Current and voltage armature air gap, Inch: .048
AUTO-LITE STARTING MOTOR SPECIFICATIONS
Part number: MZ-4136 (starter rotates clockwise)
Bush Spring Tension, Ounces: 42-53
No Load Test: 68 amps, 5.0 volts @ 4000 RPM
Torque Test: 280 Amps, 2.0 volts, Torque, Lbs.Ft.: 4.4

quote:Originally posted by doughboywoodmike

what is that in pounds

http://i219.photobucket.com/albums/cc115/doughboywoodmike/HPIM0572.jpg

[img]http://i77.photobucket.com/albums/j54/deepnhock/1937CEBearfoot

[LarkVIII]

What exactly are you trying to diagnose? This engine was 90 hp new in a 2910-3120 lb automobile.Do your compression check dry,if the cylinders are all about the same you should be ok,if not add a shot of oil in the low ones and retest,if they come up it's ring time,if not look for burned valves or blown head gasket. Nice pic

63VY4 Leakin' Lena Hagerstown MD

[Roscomacaw]

Ideally, it would come in at 105lbs. or very close. But something less can still provide a respectable performance. What's key is that all the readings are within a 15% range of variance.
Another key point is that the car's cranking system is up to snuff so that the engine spins adequately while doing the compression check.
As has been reviewed here numerous times, these 6volt vehicles often end up with a wrong-sized battery or starter cable thru the years and that (or dirty connections) can make a dramatic effect on the way an engine spins with the starter. Low cranking speed can make a difference in the readings you get while doing a compression test. [^]

Miscreant Studebaker nut in California's central valley.

1957 Transtar 1/2ton
1960 Larkvertible V8
1958 Provincial wagon
1953 Commander coupe
1957 President two door