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Pelican Technical Article:

BMW Technical Article

BMW E30 3 Series Specification
Jared Fenton

Difficulty Level: 1
Difficulty scale: Adding air to your tires is level one
Rebuilding a BMW Motor is level ten

    

Engine Specification:

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Engine Code M10 M42B18 M20B27 M20B25 S14
Cylinders 4 4 6 6 4
Bore mm (in) 89.0 (3.504) N/A 89.0 (3.504) 89.0 (3.504) 93.4 (3.679)
Stroke mm (in) 71.0 (2.795) N/A 81.0 (3.189) 75.0 (2.953) 84.0 (3.307)
Displacement cc (cu. in.) 1766 (107.8) 1796 (109.5) 2693 (164.0) 2492 (152.0) 2305 (140.6)
Compression Ratio 9.0:1 10.0:1 9.0:1 8.8:1 10.5:1
Horsepower SAE net @rpm 101 @ 5800 136 @ 6000 121 @ 4250 168 @ 5800 192 @ 6750
Torque lbs.-ft. @rpm SAE 103 @ 4500 127 @ 4600 170 @ 3250 164 @ 4300 170 @ 4750
Fuel Delivery Bosch L-Jetronic Bosch Motronic Bosch Motronic Bosch Motronic 1.1 Bosch Motronic
Firing Order 1-3-4-2 1-3-4-2 1-5-3-6-2-4 1-5-3-6-2-4 1-3-4-2 *


Transmission Specifications:

*    Later 4 Cylinder cars equipped with either 4HP 22 or 4HP 22EH

**  Early 4 Cylinder cars were also equipped with the ZF S5-16 Transmission, check driverís side of transmission casing for identification tag.

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Automatic Transmission Type ZF 3 HP 22* N/A 4HP 22 or 4HP 22EH 4HP 22 or 4HP 22EH N/A
Manual Transmission Type Getrag 240** Getrag 260/5 Getrag 260 Getrag 260 Getrag 260/5
Manual Transmission Fluid 1.2 qt. (1.15 L) 1.2 qt. (1.1 L) 1.32 qt. (1.25 L) 1.32 qt. (1.25 L) 1.6 qt. (1.51 L)
Automatic Transmission Fluid 2.1 Qt. (2.0 L) 3.2 qt. (3.0 L) 3.2 qt. (3.0 L) 3.2 qt. (3.0 L) N/A

Model ZF 3HP 22 ZF 4HP 22 ZF 4HP 22EH
1st Gear 2.73 2.48 2.48
2nd Gear 1.56 1.48 1.48
3rd Gear 1 1 1
4th Gear N/A 0.73 0.73
Reverse Gear 2.09 2.09 2.09

Final Drive/ Differential Specifications:

Please keep in mind that several different ratios were available with these cars. These ratios are the stock specifications.

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Final Drive (Auto Trans.) 3.91:1 N/A 2.78:1 2.91:1 N/A
Final Drive (Manual Trans.) 3.91:1 4.10:1 2.78:1 3.73:1 4.10:1
Differential Fluid 0.95 qt. (0.9 L) 1.2 qt. (1.1 L) 1.9 qt. (1.7 L) 1.9 qt. (1.7 L) 1.9 qt. (1.7 L)

Fluids and Lubrication Capacities:

* Indicates oil amount with filter changed.

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Engine Oil 4.26 qt. (3.75 L)* 5.3 qt. (5.0 L)* 4.46 qt. (4.25 L)* 4.46 qt. (4.25 L)* N/A
Differential Fluid 0.95 qt. (0.9 L) 1.2 qt. (1.1 L) 1.9 qt. (1.7 L) 1.9 qt. (1.7 L) 1.9 qt. (1.7 L)
Brake Fluid Top up as Needed Top up as Needed Top up as Needed Top up as Needed Top up as Needed
Power Steering Fluid Top up as Needed Top up as Needed Top up as Needed Top up as Needed Top up as Needed
Engine Coolant 7.4 qt. (7.0 L) 6.9 qt. (6.5 L) 12.7 qt. (12.0 L) 11.0 qt. (10.5 L) N/A

Spark Plug Specifications:

* Gap may have a +/- tolerance of 0.1mm (0.004 in.)

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325 1988 325i/is/iC/iX 1987-92
Spark Plug (Bosch) WR9DS F8 LCR WR9LS WR9LS W8LCR
Spark Plug (NGK) BPR 5 EIX BKR 6 EK ZGR 5 A ZGR 5 A N/A
Electrode Gap 0.8mm (0.032 in.)* 0.8mm (0.032 in.)* 0.7mm (0.027 in)* 0.7mm (0.027 in)* 0.7mm (0.027 in)*
Tightening Torque 17 ft./lbs. 17 ft./lbs. 17 ft./lbs. 17 ft./lbs. 17 ft./lbs.

Valve Clearance Specifications:

*    1/2 turn between cylinders (approx. 180 degrees)

**  1/3 turn between cylinders (approx. 120 degrees)

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Valve Clearance (warm) 0.25mm (0.010in.) Non-adjustable 0.30mm (0.012in.) 0.30mm (0.012in.) 0.30mm (0.012in.)
Valve Clearance (cold) 0.20mm (0.008in.) Non-adjustable 0.25mm (0.010in.) 0.25mm (0.010in.) 0.25mm (0.010in.)
Valve Adjustment Sequence 1-3-4-2 * N/A 1-5-3-6-2-4 ** 1-5-3-6-2-4 ** 1-3-4-2 *

Vehicle Dimensions:

Model 318i 1984-85 318i/is/iC 1990-92 325/e/es 1984-87 325i/is/iC/iX 1987-92 M3 1987-91
Curb Weight (Manual Trans.) 2360 lbs. 2602 lbs. 2654 lbs. 2813 lbs. 2865 lbs.
Curb Weight (Auto Trans.) 2380 lbs. N/A 2698 lbs. 2865 lbs. N/A
Curb Weight (Convertible) N/A 2867 lbs. N/A 3015 lbs. N/A
Curb Weight (4 Door) 2450 lbs. 2657 lbs. 2765 lbs. 2895 lbs. N/A
Wheelbase 101.2 in. 101.2 in. 101.2 in. 101.2 in. 100.9 in.
Weight Distribution front/rear 53/47 54/46 53/47 53/47 53/47
Fuel Capacity 14.5 gal. (54.88 L) 14.5 gal. (54.88 L) 14.5 gal. (54.88 L) 14.5 gal. (54.88 L) 14.5 gal. (54.88 L)

     Well, there you have it - it's really not too difficult at all.  If you would like to see more technical articles like this one, please continue to support Pelican Parts with all your parts needs.  If you like what you see here, then please visit our online BMW catalog and help support the collection and creating of new and informative technical articles like this one.  Your continued support directly affects the expansion and existence of this site and technical articles like this one.  As always, if you have any questions or comments about this helpful article, please drop us a line.

Comments and Suggestions:
Pocofreeride Comments: My girlfriend's 1987 325i with the auto trans also has a 3.73 rear end.
September 12, 2016
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
GigMasterD Comments: My 1987 332is pure stocker had auto and 3.73 posi rear; oppposed to your chart here. Later I bought an untouched parts car, same setup, also 3.73 rear.

By the way, LOVE YOUR SITE.

Don H.
Gig Harbor, WA
August 16, 2009
  Followup from the Pelican Staff: Thanks for the kind comments, help spread the word about the site! - Wayne at Pelican Parts  

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