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Powertrain rebuild on the 1995 Saab 900 turbo convertible.

A few notes regarding the 2.3 engine swap. It has to be of the same generation, e.g. for NG900 you need a 2.3 turbo engine from a 1994-1998 9000 (B234E, B234L or B234R).

The head and the block are exactly the same. The timing and balancing gear is also the same. The end plate is identical. The only internal difference is the crankshaft with pistons (longer stroke), so you can either find a good 9000 engine and drop it straight in or rebuild your 2.0 with a crankshaft/rod/piston combo from a 2.3 turbo. The 2.3 N/A has the same crankshaft, but weaker pistons.

Further differences: the 9000 uses a different oil pan, timing cover, pumps, manifolds, mounts and other accessories. You will have to reuse all those parts from your original engine. The block will have the provisions for all configurations, but because the accessories are mounted differently, some bolt holes might be exposed to rust and need their threads refreshed.

The 9000 ECU is reported not to work correctly in NG900. A stock NG900 ECU will start and run with a 2.3, but it's certainly better if you can source a custom tune.

 

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12.05.2006: Headlights and grille
The headlights and the grille go first. The broom is retired as a hood prop rod, and replaced with an old 9-5 sway bar.

 

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12.05.2006: Bumper and airbox
The lower protective shields and the bumper come off to allow the access to the intercooler. The airbox is now in the open, so that gets removed too.

 

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12.05.2006: Intercooler and pipes
Next, the old intercooler and pipes. Since all of this will go to another car (which then gets sold), I've removed the turbo silencer while it's exposed. The new owner should thank me for it ;].

 

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13.05.2006: Exhaust system
The stock exhaust system: downpipe with catalitic converter, flex pipe, middle section with resonator, and rear muffler.

 

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15.05.2006: Engine support
Engine support installed. Time to disconnect the rear engine mount, detach the shifter linkage, unbolt and lower the front subframe.

 

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15.05.2006: Transmission
The transmission is drained of oil and removed from the car. [more...]

 

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20.05.2006: Engine out
The engine being removed out of the car. [more...]

 

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20.05.2006: On the stand
Engine out, secured on a stand.

 

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21.05.2006: Throttle body inlet pipe
A ported throttle body inlet pipe: before and after.

 

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22.05.2006: B234R
A replacement 2.3L turbo engine from a 1996 Saab 9000 Aero.

 

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25.05.2006: Engine stripped
The old engine is stripped of all accessories, oil pan cracked open.

 

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28.05.2006: Timing cover off
The 2.0 with timing cover and end plate removed. On its way into storage.

 

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28.05.2006: Out of the trunk
The 2.3 is out of the trunk, the accessories will come off shortly.

 

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28.05.2006: Ready for disassembly
The replacement engine is stripped and mounted on a stand. Ready for final disassembly.

 

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01.06.2006: Camshafts
Valve cover off, no sludge, everything looks nice and clean.

 

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01.06.2006: Crankshaft
Crankshaft and piston removal. The paper towel pieces are wrapped around the bolts on the piston rod to prevent them from scratching the crankshaft.

 

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02.06.2006: Out to rebuilder
The engine on the way to the rebuilder to have everything cleaned and polished.

 

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07.06.2006: Engine parts rebuilt
Back from the rebuilder. Parts cleaned, cylinders honed, head polished.

 

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08.06.2006: Manifold cleaning
Abrasive Dremel buffing wheels make it easy to clean manifold flanges. Unfortunately, they wear out too fast.

 

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08.06.2006: Firewall cut
Another use for your favourite rotary tool: cutting a hole in the firewall for the hydraulic clutch.

 

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16.06.2006: Parts
A big parts order from eEuroparts just landed at my door in two large boxes.

 

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18.06.2006: Cylinder head
The head is assembled with new seals and refreshed valves. [more...]

 

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21.06.2006: Engine block
Crankshaft and pistons are in with new rings and bearings. [more...]

 

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04.07.2006: Engine
This starts to look like an engine again now. [more...]

 

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09.07.2006: Engine assembled
The engine is assembled and ready to go in. [more...]

 

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10.07.2006: Installation
Engine installation in progress. [more...]

 

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10.07.2006: Transmission
A low mileage gearbox from a 1999 Saab 9-3 -- stronger, smoother, easier to shift.

 

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10.07.2006: SPEC clutch
A kevlar stage2 clutch from SPEC and a Viggen pressure plate to hold the power.

 

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15.07.2006: Engine in
Installed and running.

 

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18.07.2006: Delivery pipe
One of MP Performance leftover delivery pipes. The fit was problematic, but all worked out in the end.

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