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E30 BMW - Technical Data
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E30 BMW 320i - Technical Data



This section will predominantly deal with my own car, an E30 M20 1989 320i. It is a 2.0 litre Motronic managed fuel injected inline six. (sorry for the tongue twister). If you want to understand the various 'E' and 'M' numbers click here.

Engine | Brakes | Transmission & Driveline | Suspension & Steering | Electrics | Miscellaneous


Engine (Click to view image)
My E30 M20 320i was built in 1989. It has a 2 litre, 6 cylinder powerplant which generates 129bhp. I currently use a semi-synthetic oil (10W40). Below are some of the specifications for this engine:-

Displacement (bore x stroke) 1990cc (80 x 66mm)
Cylinders 6
Valves 12 (2 per cylinder)
Power 129bhp (95kW) @ 6,000rpm
Torque 174Nm (128lb/ft) @ 4,000rpm
Weight 117kg
Cylinder Firing Order 1-5-3-6-2-4 (No. 1 at timing cover end)
Valve Clearances (Cold) 0.25mm
Valve Clearances (Hot) 0.30mm
Air Filters Various available
Oil Filters Various available
Spark Plugs Bosch W8LCR (generally regarded as best)
Electrode Gap 0.8mm
Spark Plug Torque Setting 30 - 33Nm
Idle Speed 760 +/- 40rpm
CO% @ 3000rpm 0.7 +/- 0.5 (This can vary depending on whether it is Motronic (like this one) or Jetronic or whether it is B20 or B25}
Engine Oil Specification SAE 10W40 - 20W50 (I use semi-synthetic 10W40)
Engine Oil Capacity 4.3 Litres
Oil Pressure (Idle) 0.5 - 2.0 bars
Oil Pressure (running) 4 bars or above
Cylinder Compression 10 - 11 bars
Cylinder Head Warpage 0.10mm
Minimum Cylinder Head Thickness 124.7mm

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Brakes

My car has front discs and rear drums. I am currently driving on Textar pads, shoes & drums. The discs are ATE Powerdiscs which are both grooved & vented. I would recommend the discs for a number of reasons. They fully bed in after about 5 braking efforts (compared to the usual 100 miles I am familiar with). I have also found that they significantly reduced braking times & distances compared to the previous discs on the car. There is also a new ATE brake master cylinder on the car, the previous one suffered from old age and made the car feel like there were no brakes at all.
The following info is based on my car which has rear drums - for info on rear discs email me.

Brake Fluid Hydraulic Brake Fluid to SAE J 1703 or DOT 4
Brake Discs ATE Powerdiscs (grooved and vented discs)
Brake Pads Textar
Brake Shoes Textar
Brake Drums Textar
Ventilated Brake Disc Minimum Thickness 20.0mm (check mark on disc to confirm)
Brake Pad Minimum Thickness 2.0mm
Brake Shoe Minimum Thickness 2.0mm
Handbrake Lever Travel 5 to 8 clicks (self adjusting)
Brake Pedal to Bulkhead Distance RHD 273mm - LHD 235mm (measured horizontally from bottom of pedal)
Handbrake Lever Travel 5 to 8 clicks (self adjusting)
Handbrake Lever Travel 5 to 8 clicks (self adjusting)

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Transmission & Driveline


Transmission Fluid (manual) Gear oil, viscosity SAE 80 to API-GL4, or single grade mineral based engine oil, viscosity SAE 20, 30 or 40 to API-SG
Transmission Fluid (auto) Dexron II Type ATF
Final Drive BMW approved hypoid gear oil, viscosity SAE 90


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Suspension & Steering

My car has M-Tech suspension all round. I don't as yet know the full spec of these - will find out soon!

Tyre Sizes
There should be a guide attached to the driver's door frame of the car.
316 175/70 R14
316i 175/70 R14, 195/65 R14
318i 175/70 R14
320i 195/65 R14, 205/55 R15
I am currently running on Falken 195/65 R15. These are not the recommended size but the seem to provide sufficient holding and stopping capabilities.They were,on the car when I bought it and so far have lasted short of 20,000 miles. Being taller than recommended, they don't seem to rub off the bodywork. The only negative aspect to them isd the fact that this size tyre doesn't fit in the spare wheel well!
325i 195/65 R14, 205/55 R15, 200/60 x 356
Tyre Pressures (measured when cold) - these are guides only. Many people run on higher pressures than these.
316 Front: 1.9 bar (28 psi)
Rear: 2.1 bar (30 psi)
316i Front: 2.0 bar (29 psi)
Rear: 2.1 bar (30 psi)
318i Front: 1.8 bar (26 psi)
Rear: 1.9 bar (28 psi)
320i Front: 1.9 bar (28 psi)
Rear: 2.0 bar (29 psi)
325i Front: 2.2 bar (32 psi)
Rear: 2.3 bar (33 psi)
Wheel Bolt Torque 100 Nm (Double check this as alloys are soft and prone to cracking if over-tightened)
Power Steering Fluid Dexron II Type ATF

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Electrics

Click here for a full list of fuses and relays
I find that it is helpful to carry spare bulbs wherever I go just in case! The following are the main bulbs used in the car and what I believe are the standard codes for them.
Rear Side / Interior / Number Plate Bulb 12v 10w 245S
Rear Side / Interior / Number Plate Bulb 12v 5w 207S
Rear Side / Interior / Number Plate Bulb 12v 5w 501
Rear Side / Interior / Number Plate Bulb 12v 5w 239
Rear Side / Interior / Number Plate Bulb 12v 4w 233
Brake / Rear Side Bulb 12v 21/5w 380
Brake / Reverse / Rear Fog / Indicator Bulb 12v 21w 382
Halogen Hedlamp Bulb 12v 55w 448

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Miscellaneous




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