I have a second opinion.  An engine builder had a set of DJ pistons
and measured compression ratio at 10.3:1.

On 12/20/08, Kim Springer <kimspringer@astound.net> wrote:
> And no Katto get the 112i! I also still disagree with the Compression Ratio.
> My measured numbers on my DJ were 9.6:1.
>
> Kim
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Chris S
> Sent: Saturday, December 20, 2008 9:37 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: DJ-code WBX technical specs
>
> 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"
>
>

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