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Mechanical Specifications


The engines used in the 1941 Buicks were introduced in the 1930s: the larger 320 cubic inch unit having been introduced in 1936 and the 248 cubic inch engine in 1937. Both were in-line eight cylinder designs with Buick's traditional overhead valve arrangement. The smaller engine, used in the Special (40) and Super (50) series, made 115 horsepower with a single carburetor, and 125 with dual carburetion (standard on Super). The larger engine generated 165 horsepower with the standard dual carburetors. This was the most horsepower of any American car that year, and was used in the Century (60), Roadmaster(70) and Limited (90) series.

  Special
(Series 40)
Super
(Series 50)
Century
(Series 60)
Roadmaster
(Series 70)
Limited
(Series 90)
DIMENSIONS          
Type OHV in-line eight cylinder OHV in-line eight cylinder OHV in-line eight cylinder OHV in-line eight cylinder OHV in-line eight cylinder
Bore 3-3/32" 3-3/32" 3-7/16" 3-7/16" 3-7/16"
Stroke 4-1/8" 4-1/8" 4-5/16" 4-5/16" 4-5/16"
Displacement 248 CID 248 CID 320.2 CID 320.2 CID 320.2 CID
Compression Ratio 6.5:1
7.0 to 1
(with dual carbs)
7.0 to 1
(dual carbs standard)
7.0 to 1
(dual carbs standard)
7.0 to 1
(dual carbs standard)
7.0 to 1
(dual carbs standard)
Induction 1x2 bbl Stromberg or Carter carburetor (dual carburetors optional) 2x2 bbl Stromberg or Carter carburetors 2x2 bbl Stromberg or Carter carburetors 2x2 bbl Stromberg or Carter carburetors 2x2 bbl Stromberg or Carter carburetors
Horsepower 115 @ 3500 RPM
125 @ 3800 RPM

(with dual carbs)
125 @ 3800 RPM 165 @ 3800 RPM 165 @ 3800 RPM 165 @ 3800 RPM
Torque 210 @ 2000 RPM
215 @ 2000 RPM
(with dual carbs)
215 @ 2000 RPM 278 @ 2200 RPM 278 @ 2200 RPM 278 @ 2200 RPM
Firing Order 1-6-2-5-8-3-7-4 1-6-2-5-8-3-7-4 1-6-2-5-8-3-7-4 1-6-2-5-8-3-7-4 1-6-2-5-8-3-7-4
Engine Weight 721.5 lbs. 721.5 lbs. 862.3 lbs. 862.3 lbs. 862.3 lbs.
Main Bearings 5 5 5 5 5
Intake Valve Size 1-17/32" 1-17/32" 1-25/32" 1-25/32" 1-23/32"
Exhaust Valve Size 1-11/32" 1-11/32" 1-7/16" 1-7/16" 1-7/16"
Valve Lift (intake) .348" .348" .347" .347" .347"
Valve Lift (exhaust) .348" .348" .342" .342" .342"
Intake Duration 13 BTDC/68 ATDC 13 BTDC/68 ATDC 14 BTDC/71 ATDC 14 BTDC/71 ATDC 14 BTDC/71 ATDC
Exhaust Duration 55 BTDC/22 ATDC 55 BTDC/22 ATDC 56 BTDC/25 ATDC 56 BTDC/25 ATDC 56 BTDC/25 ATDC
Valve Lash (hot) .015" .015" .015" .015" .015"
Distributor Point Opening .015" .015" .015" .015" .015"
Dwell 31 31 31 31 31
Spark Plug Gap .025" to .030" .025" to .030" .025" to .030" .025" to .030" .025" to .030"
Spark Plug Type AC type 104 10mm AC type 104 10mm AC type 104 10mm AC type 104 10mm AC type 104 10mm
           
DRIVELINE          
1st Gear 2.67:1 2.67:1 2.39:1 2.39:1 2.39:1
2nd Gear 1.66:1 1.66:1 1.53:1 1.53:1 1.53:1
3rd Gear 1:1 1:1 1:1 1:1 1:1
Reverse 3.02:1 3.02:1 2.53:1 2.53:1 2.53:1
           
Rear Axle Ratio (std./opt.) 4.4:1 / 3.9:1 4.1:1 / 3.9:1 3.9:1 / 3.6:1 3.9:1 / 3.6:1 4.2:1
           
RECOMMENDED FLUIDS          
Engine Oil SAE 20W SAE 20W SAE 20W SAE 20W SAE 20W
Transmission Oil SAE 90 SAE 90 SAE 90 SAE 90 SAE 90
Differential Oil SAE 90 SAE 90 SAE 90 SAE 90 SAE 90
           
CAPACITIES          
Oil Capacity (quarts) 6 (refill)
8 (dry)
6 (refill)
8 (dry)
8 (refill)
10 (dry)
8 (refill)
10 (dry)
8 (refill)
10 (dry)
Fuel Capacity 18 gallons 18 gallons 18 gallons 18 gallons 21 gallons
Cooling System Capacity 14-1/4 quarts w/ heater
13 quarts w/o heater
14-1/4 quarts w/ heater
13 quarts w/o heater
18 quarts w/ heater
16-3/4 quarts w/o heater
18 quarts w/ heater
16-3/4 quarts w/o heater
18 quarts
(heater standard)
Transmission Capacity 1-3/4 pints 1-3/4 pints 2-1/2 pints 2-1/2 pints 2-1/2 pints
Rear Axle Capacity 3 pints 3 pints 3 pints 3 pints 4 pints
Steering Gear Capacity 15 oz. 15 oz. 18 oz. 18 oz. 18 oz.
           
TORQUE SPECS.          
Head Torque 65-70 lb.-ft. 65-70 lb.-ft. 65-70 lb.-ft. 65-70 lb.-ft. 65-70 lb.-ft.
Main Torque 115-120 lb-ft. 115-120 lb-ft. 115-120 lb-ft. 115-120 lb-ft. 115-120 lb-ft.
Rod Torque 45-50 lb.-ft. 45-50 lb.-ft. 60-65 lb.-ft. 60-65 lb.-ft. 60-65 lb.-ft.
Flywheel Torque 40 lb.-ft 40 lb.-ft 55 lb.-ft 55 lb.-ft 55 lb.-ft
           

E-mail me at toolman8@sbcglobal.net

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Last modified on 02/15/2005

Thanks, Fidget!