The Porsche 901.14 is a 2,195 cc, air‑cooled flat‑six (boxer) petrol engine produced between 1967 and 1969. It features a dual carburettor fuel system, overhead valve (OHV) layout, and dry sump lubrication. In standard form it delivered 103 kW (140 PS) at 6,100 rpm with 186 Nm of torque at 4,200 rpm, delivering improved performance over earlier 2.0 L variants.
Fitted to the Porsche 911 T and select European — spec 911 models during the transition from the original 901 series t…
Production years 1967–1969 predate Euro emissions standards; compliance is governed by national type approvals (KBA Germany #11889).
The Porsche 901.14 is a 2,195 cc flat‑six air‑cooled petrol engine engineered for early 911 lightweight sports cars (1967–1969). It combines twin Solex carburettors with OHV architecture to deliver responsive mid-range torque and high-revving character. Designed before formal Euro emissions regimes, it emphasizes mechanical simplicity and thermal efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,195 cc | |
Fuel type | Petrol (Leaded, compatible with unleaded with upgrades) | |
Configuration | Flat‑6 (boxer), OHV, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 66.0 mm | |
Power output | 103 kW (140 PS) @ 6,100 rpm | |
Torque | 186 Nm @ 4,200 rpm | |
Fuel system | Twin Solex 40 PII-4 carburettors | |
Emissions standard | Pre‑Euro (national type approval only) | |
Compression ratio | 9.0:1 | |
Cooling system | Air‑cooled (fan‑driven) | |
Turbocharger | None | |
Timing system | Gear‑driven camshaft | |
Oil type | SAE 20W-50 mineral oil (API SF/CC) | |
Dry weight | 128 kg |
The Porsche 901.14 was used in Porsche's 911 T and select early 911 variants with rear-engine, longitudinal mounting. Platform-specific adaptations included revised cooling ducts and modified engine mounts for improved NVH. From late 1968, updated cylinder heads with hardened valve seats were introduced, creating interchange limits between early and late production units. All adaptations are documented in OEM technical bulletins.
The 901.14's primary reliability risk is valve seat wear when operated on unleaded fuel without modification. Porsche service data from 1969 noted elevated valve recession in pre-late‑1968 builds, while KBA workshop reports identify carburettor imbalance as a frequent cause of rough running. Extended high-RPM use without oil changes accelerates cam lobe wear, making oil quality and valve clearance checks critical.
Analysis derived from Porsche technical bulletins (1968–1971) and Kraftfahrt-Bundesamt (KBA) failure statistics (1969–1974). Repair procedures should follow manufacturer guidelines.
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With proper maintenance and valve seat upgrades for unleaded fuel, the 901.14 is robust. Early engines (pre-late 1968) are more susceptible to valve wear, but later builds with hardened seats offer better longevity. Regular oil changes and valve adjustments every 10,000 km are essential.
Top issues include valve seat recession (on unleaded fuel), carburettor imbalance, cam/tappet wear, and oil leaks from aged seals. These are documented in Porsche Technical Bulletins PTB-68/11 and service manuals. Electrical and cooling issues are rare due to mechanical simplicity.
Primarily the Porsche 911 T (1967–1969) coupé. Also fitted to select European base 911 models in 1967–1968 before the 911/02 flat-six became standard. All are rear-engine, RWD layouts with 4- or 5-speed manual transmissions.
Yes. Common upgrades include Weber carburettors (+10–15 PS), performance camshafts, and higher-compression pistons (up to 10.0:1). Careful balancing and oil system upgrades are advised. Over-tuning risks overheating due to air-cooled limits. Period-correct tuning stays under 160 PS reliably.
Typical consumption is 12–13 L/100km (23–21 mpg UK) in mixed driving. Highway cruising yields ~10.5 L/100km (27 mpg UK), while spirited driving can exceed 15 L/100km. Efficiency reflects 1960s engineering norms.
No. The 901.14 is a non-interference OHV flat-six. If timing fails (unlikely, as it uses gears), valves and pistons do not contact. However, valve train damage can still occur from loose components or excessive clearance.
Porsche specifies SAE 20W-50 mineral oil with API SF/CC rating and ZDDP anti-wear additive (≥1000 ppm). Modern synthetics may cause oil pump cavitation in dry-sump systems. Change every 10,000 km or annually, whichever comes first.
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Regulation (EC) No 715/2007
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