1973.5 Porsche 911T Type 911/91 Engine – Original 2.4L Flat-Six with Bosch CIS Injection
A highly desirable Type 911/91 2.4-liter flat-six originally built for a US-market 1973.5 Porsche 911T. This numbers-correct magnesium-case engine retains its Bosch CIS fuel injection, ignition setup, alternator, cooling system, heat exchangers, and muffler. According to the seller, the engine was running when removed approximately twelve years ago and has been stored indoors since—a strong foundation for restoration, rebuild, or a period-correct concours installation.
Factory Specification & Technical Details
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Engine Type: 911/91
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Displacement: 2,341cc
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Bore x Stroke: 84mm × 70.4mm
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Application: US-spec 1973.5 Porsche 911T (CIS introduction year)
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Case Material: Magnesium
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Case Stamping: ☆6133837☆ (correct for 1973.5 911T engines)
Included Components
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Bosch CIS Fuel Injection System
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Fuel distributor
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Stainless-steel CIS airbox by Webb Machine Design
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Ignition System
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Distributor
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Spark plug wires
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Coil
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Cooling System
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Eleven-blade fan
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Alternator
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Engine tin finished in black
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Fan shroud
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Exhaust System
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Heat exchangers
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Muffler
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Driveline Components
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Flywheel
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Clutch
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Condition & Suitability
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Engine was running when removed ~12 years ago
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Stored indoors since removal
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Ideal candidate for:
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Period-correct 1973.5 911T restoration
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CIS-specific vintage Porsche projects
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Engine builders seeking an untouched 2.4L core
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Collectors sourcing a matching-era drivetrain
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The 1973.5 911T marked Porsche’s transition to Bosch CIS fuel injection, making the 911/91 engine unique in the 2.4L lineup. Its combination of a magnesium case, mechanical refinement, and CIS reliability makes it a sought-after powerplant among early G-body enthusiasts.
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Bought a rear differential and it runs silently after installation.Mechanic confirmed the unit was in very good condition.Delivery tracking was accurate throughout shipping.I would definitely buy again.
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Purchased LED tail lights and visibility improved instantly.They look modern and clean on the car.No coding required after installation.Very satisfied customer.
Ivan Dimitrov (verified owner) –
Bought a water pump and cooling system works perfectly again.No leaks after installation.Part looked high quality.Very pleased with the purchase.
Raissa Ivanova (verified owner) –
Engine wiring harness solved multiple electrical faults instantly.All connectors were intact and clean.Part looked professionally inspected before shipping.Very impressed with the quality control.
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Ordered ignition coils and engine misfires disappeared.Idle became smooth immediately.Shipping was quick and secure.Great value for money.
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Bought wheel bearings and noise disappeared completely.Driving feels smooth and quiet now.Parts appeared brand new condition.Very satisfied with the outcome.
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Adama Traore (verified owner) –
Ordered engine mounts and vibrations disappeared completely.Driving feels comfortable again.Packaging was excellent.Reliable purchase.
Beatrice Moreau (verified owner) –
Bought a rear differential and it runs silently after installation.Mechanic confirmed the unit was in very good condition.Delivery tracking was accurate throughout shipping.I would definitely buy again.
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Ordered rear suspension arms and handling improved.Car feels stable at high speeds now.Everything arrived complete.Very satisfied with quality.
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Bought rear subframe and alignment was perfect.Mechanic had no complaints installing it.Condition exceeded expectations.Highly satisfied buyer.
Daniel Petrescu (verified owner) –
Ordered engine mounts and vibrations disappeared completely.Driving feels comfortable again.Packaging was excellent.Reliable purchase.