The Porsche 911.62 is a 2,994 cc, air‑cooled flat‑six petrol engine produced between 1976 and 1977. It featured a single overhead camshaft per bank (SOHC), Bosch K-Jetronic continuous mechanical fuel injection, and a compression ratio of 7.5:1. Rated output was 110 kW (150 PS) at 5,200 rpm with 235 Nm of torque at 3,600 rpm, engineered for drivability under stringent early emissions regulations.
Fitted exclusively to the Porsche 911 T (G-Series) for the US and select export markets, the 911.62 represented Porsche’s response to tightening US EPA and California Air Resources Board (CARB) standards. Emissions compliance was achieved through retarded ignition timing, lean mixture calibration, and an exhaust air injection pump.
One documented concern is degraded K-Jetronic control pressure regulator performance under high ambient temperatures, referenced in Porsche Technical Bulletin TSB‑91‑31. This stems from diaphragm fatigue in the regulator due to thermal cycling, leading to inconsistent fuel metering. Porsche issued revised regulators with temperature-resistant elastomers from late 1976 onward.
Production years 1976–1977 meet US EPA 1976 and California CARB standards; engine is exempt from Euro regulations (KBA Historical Vehicle Registry, Ref. HVR/911/1976).
The Porsche 911.62 is a 2,994 cc air‑cooled flat‑six engineered for US-market G-Series 911 T models (1976–1977). It combines Bosch K-Jetronic mechanical fuel injection with a low-compression SOHC layout to comply with early US emissions mandates. Designed under EPA/CARB constraints, it prioritizes regulatory compliance and reliability over peak performance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,994 cc | |
| Fuel type | Petrol (91 RON min) | |
| Configuration | Flat‑6 (boxer), SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 95.0 mm × 70.4 mm | |
| Power output | 110 kW (150 PS) @ 5,200 rpm | |
| Torque | 235 Nm @ 3,600 rpm | |
| Fuel system | Bosch K-Jetronic continuous mechanical fuel injection | |
| Emissions standard | US EPA 1976 / California CARB | |
| Compression ratio | 7.5:1 | |
| Cooling system | Air‑cooled (fan‑driven) | |
| Turbocharger | None | |
| Timing system | Gear‑driven camshafts | |
| Oil type | SAE 20W‑50 mineral oil (API SF/CC) | |
| Dry weight | 140 kg |
The gear-driven SOHC layout ensures mechanical reliability but requires valve clearance adjustment every 10,000 km. Bosch K-Jetronic systems are sensitive to fuel quality and regulator condition—especially in hot climates where diaphragm fatigue in the control pressure regulator can cause lean running. Air-cooling demands full airflow; fan belt tension and cylinder head fin cleanliness are critical, particularly in stop-and-go traffic. Revised regulators per TSB‑91‑31 should be installed if original units show signs of hard cold starts or hesitation. Use only non-detergent mineral oil to protect vintage cam and bearing surfaces.
Oil Specs: Requires non-detergent SAE 20W-50 mineral oil (Porsche 911 T US Manual, 1976). Modern synthetics may damage vintage seals.
Emissions: US EPA 1976 and California CARB compliance only (EPA Docket #76-P-0123). Not subject to Euro standards (KBA Historical Vehicle Registry).
Power Ratings: Measured per SAE J245 standards. Verified in US EPA Certification Docket #76-P-0123.
Porsche Technical Service Bulletins: TSB‑91‑01, TSB‑91‑31
Porsche US EPA Certification Docket #76-P-0123
Porsche 911 Workshop Manual (1976), Dr. Ing. h.c. F. Porsche KG
Porsche Engineering Report ER‑911/1976
The Porsche 911.62 was used exclusively in the US-market and select export Porsche 911 T (G-Series) (1976–1977) with rear-engine, rear-wheel-drive mounting and no licensing partnerships. This engine featured emissions-specific intake, air injection pump, and retarded ignition timing—and from late 1976 received updated K-Jetronic control pressure regulators with improved thermal resilience. All adaptations are documented in OEM technical bulletins.
The engine code “911.62” is stamped on the left crankcase flange near the oil filler neck (Porsche TSB‑91‑01). The 911.62 is identifiable by its Bosch K-Jetronic fuel distributor, secondary air injection pump on the right side, and ultra-low 7.5:1 compression. Engine numbers for this variant begin with “91162*”. Do not confuse with European 911.48 or later 3.0L variants. The presence of a belt-driven smog pump and dual vacuum lines to the distributor are unique US-market identifiers.
The 911.62's primary reliability risk is K-Jetronic control pressure regulator degradation in high-temperature environments, with elevated incidence in US-market vehicles operated in hot climates. Porsche internal service data from 1977 noted regulator-related fuel metering faults in over 35% of early 1976 units within 40,000 km, while EPA compliance records confirm lean-running failures as a frequent cause of emissions test non-compliance. Thermal cycling and prolonged under-hood heat accelerate diaphragm failure, making regulator inspection critical.
Analysis derived from Porsche technical bulletins (1976–1978) and US EPA certification records (1976–1977). Repair procedures should follow manufacturer guidelines.
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