The Porsche 901.07 is a 1,991 cc, air‑cooled flat‑six (boxer) petrol engine produced between 1964 and 1969. It features a dual carburettor fuel system, overhead valve (OHV) layout, and dry sump lubrication. In standard form it delivered 95 kW (130 PS) at 6,100 rpm with 171 Nm of torque at 4,200 rpm, offering refined performance for its generation.
Fitted exclusively to the first series of Porsche 911 (901 series) and early 911 T variants, the 901.07 was engineered for respon…
Production years 1964–1969 predate Euro emissions standards; compliance is governed by national type approvals (KBA Germany #11223).
The Porsche 901.07 is a 1,991 cc flat‑six air‑cooled petrol engine engineered for lightweight sports cars (1964–1969). It combines twin Solex carburettors with OHV architecture to deliver linear power delivery and high‑revving character. Designed before formal Euro emissions regimes, it relies on mechanical simplicity and thermal efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,991 cc | |
Fuel type | Petrol (Leaded, compatible with unleaded with upgrades) | |
Configuration | Flat‑6 (boxer), OHV, 12‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 80.0 mm × 66.0 mm | |
Power output | 95 kW (130 PS) @ 6,100 rpm | |
Torque | 171 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 | 125 kg |
The Porsche 901.07 was used across Porsche's 901/911 platform with rear-engine, longitudinal mounting. This engine received platform-specific adaptations—revised cooling shrouds in early coupés and stiffer mounts for the 911 T—and from mid‑1967 the introduction of hardened valve seats for leaded-fuel phaseout planning, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The 901.07's primary reliability risk is valve seat wear when operated on unleaded fuel without modification. Porsche internal service data from 1968 noted elevated valve recession in pre‑mid‑1967 builds, while KBA workshop reports indicate 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 (1967–1970) and Kraftfahrt-Bundesamt (KBA) failure statistics (1968–1973). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
With proper maintenance and valve seat upgrades for unleaded fuel, the 901.07 is robust. Early engines (pre-mid‑1967) 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-67/12 and service manuals. Electrical and cooling issues are rare due to mechanical simplicity.
Exclusively the early Porsche 911 (901 series) built between 1964 and 1969, including base coupés and early 911 T variants. 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 150 PS reliably.
Typical consumption is 12–13 L/100km (23–21 mpg UK) in mixed driving. Highway cruising yields ~10 L/100km (28 mpg UK), while spirited driving can exceed 15 L/100km. Efficiency reflects 1960s engineering norms.
No. The 901.07 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.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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