The gentleman from whom I bought my engine sent me technical specs for
the mysterious and marvelous DJ-code WBX. I know there's been some
interest in the "secrets" (higher compression, different ECU, timing,
maybe others?) behind the higher power output as it would be useful to
apply them to a WBX during rebuild. As promised, I'm posting it here
both for future reference and analysis.

Please keep in mind these apply to DJ-code WBX running the original
DJ-code harness and ECU, which is different from 2.1l MV and 1.9l DH
WBX.

DJ Engine - 2.1l Waterboxer - FI
Technical Specifications

Vehicle Identification

capacity: 2109cc
mumber of cylinders/type: 4/overhead valve
production run: 2/1985 - 10/1992
output: 82kW - 112bhp DIN @4800 RPM
torque: 174Nm - 128 lb-ft @2800 RPM
bore: 94 mm
stroke: 76 mm
compression ratio: 10.5:1
minimum octane: 98 RON - 93 (R+M)/2
ignition type: transistorized hall effect
trigger location: distributor
fuel system: Bosch Digijet Injection
type: multi-point fuel injection - intermittient
air metering: flow

Valve timing at 1mm lift in degrees

inlet open: 10 BTDC
inlet close: 48 ABDC
exhaust open: 50 BBDC
exhaust close: 0 ATDC

Valve dimensions

inlet diameter: 40 mm
exhaust diameter: 34mm

Tuning and Emission

ignition coil supply voltage: 11v
primary resistance: coil green label .5 - .8 ohm - coil grey label: .6 - .8 ohm
secondary ressistance: coil green label 2400 - 3500 ohm - coil grey
label: 6900 - 8500 ohm
firing order: 1 - 4 - 3 - 2
distributor part number: Bosch 0 237 022 054
ignition timing: 10 +/- 1 BTDC @ 800 RPM without vacuum (see note)
ignition advance checks: 0 - 2 @ 1050 RPM w/o vacuum and basic timing
2 - 6 @1300 RPM w/o vacuum and basic timing
12 - 16 @2400 RPM w/o vacumm and basic timing
vacuum advance range: 12 - 16 engine degrees (9-11)
idle speed: 800 +/- 50 RPM
oil temp for CO test: 80C - 176F
CO content @ idle: 2 +/- .5 % volume
HC content @ idle: 300 ppm

Service checks and adjustments

spark plugs: Bosch W5DCO / W7CCO
electrode gap: .7mm
valve clearance: hydraulic
compression: 11 - 14 bar (150 psi - 195 psi)
oil pressure: 2 bar @ 2000 rpm @ 80C/176F

Lubricants and capacities

engine oil: 10w30 (sf)
oil capacity with filter: 4.5 litres
gearbox oil: 80W - 90W
gearbox oil capacity: 3 litres (Syncro 4.5 litres)
autobox oil grade: Dexron (final drive 90W)
autobox oil capacity: 3 litres

Notes

When setting ignition timing on vehicles with DIS (digital idle
stabilisation) the two connectors of the DIS unit must be removed and
plugged together.

Disconnect engine crankcase breather and plug on side of air cleaner.

--
Chris S.
Disclaimer: "Death and serious injury may occur"