Lancia Lambda

Lancia Lambda: which version to buy and why

There is only one generation of the Lancia Lambda (1922–1931, Coupe), so the buying choice is not “which year of body” but which of three petrol manuals to live with: 2.1 MT, 2.4 MT, or 2.6 MT. All three are Gasoline, 4-cylinder V-shaped, 2 valves per cylinder, No boost, Front, longitudinal, Carburetor, Manual with 3 gears, RWD, with Dependent, leaf spring front suspension and Drum front brakes.

There is only one generation of the Lancia Lambda (1922–1931, Coupe), so the buying choice is not “which year of body” but which of three petrol manuals to live with: 2.1 MT, 2.4 MT, or 2.6 MT. All three are Gasoline, 4-cylinder V-shaped, 2 valves per cylinder, No boost, Front, longitudinal, Carburetor, Manual with 3 gears, RWD, with Dependent, leaf spring front suspension and Drum front brakes. Years overlap completely (each version is listed 1922–1931). What you actually buy, then, is displacement and power: 2121 / 2375 / 2569 cm³ and 49 / 59 / 69 hp (37 / 44 / 52 kW). Torque, 0–100, top speed, mpg, kerb weight, gross weight, tank, ground clearance, and wheel sizes are not measured in this catalogue for any version — so “which is faster” and “which is lighter per horse” cannot be scored from those fields. What can be scored is how much extra engine you get for each step, and how efficiently that extra volume is used.

Specs that actually differ (and what does not)

The 2.4 MT is not a different drivetrain or a later generation: it is +254 cm³ and +10 hp / +7 kW versus 2.1 MT, still peaking at 3250 rpm. The 2.6 MT is +194 cm³ and another +10 hp / +8 kW versus 2.4 MT, and it is the only one that peaks higher — 3500 rpm instead of 3250. From the smallest to the largest you add 448 cm³ and 20 hp / 15 kW: 2.6 MT has 40.8% more horsepower than 2.1 MT (69 ÷ 49) and 40.5% more kilowatts (52 ÷ 37).

Power per litre (hp ÷ displacement in litres) is the cleanest comparison when weight is not measured:

• 2.1 MT: 49 ÷ 2.121 ≈ 23.1 hp/L (37 ÷ 2.121 ≈ 17.4 kW/L)
• 2.4 MT: 59 ÷ 2.375 ≈ 24.8 hp/L (44 ÷ 2.375 ≈ 18.5 kW/L)
• 2.6 MT: 69 ÷ 2.569 ≈ 26.9 hp/L (52 ÷ 2.569 ≈ 20.2 kW/L)

Each step up is not only bigger; it is denser. 2.4 MT extracts about 1.8 hp more per litre than 2.1 MT. 2.6 MT extracts about 2.0 hp more per litre than 2.4 MT, and about 3.8 hp/L more than 2.1 MT. In relative terms, specific output of 2.6 MT is about 16% above 2.1 MT (26.9 ÷ 23.1). That is why “just buy the small one, they are the same car” is the wrong reading of this table: the largest engine is both the most powerful and the most power-dense of the three.

The extra displacement is not linear with the extra power in the same way at each step. 2.1 MT → 2.4 MT adds 254 cm³ for 10 hp, or about 25.4 cm³ per extra horsepower. 2.4 MT → 2.6 MT adds 194 cm³ for 10 hp, or about 19.4 cm³ per extra horsepower. The second jump is the cheaper one in engine size: you pay less extra volume for the same +10 hp. If the question is “what does the next engine buy?”, the 2.6 MT is the more efficient upgrade from the middle car than the 2.4 MT is from the base.

Generations: there is nothing to pick between

People searching “Lancia Lambda generations” or “which year Lambda” still hit a one-generation model. 1 generation ran 1922–1931, body Coupe, 3 versions. There is no second generation in the data, and no restyling listed as a separate generation. Production start and stop for 2.1 MT, 2.4 MT, and 2.6 MT are the same dates. You cannot use “later generation, better chassis” as a buying rule here: chassis fields that exist are identical (front: Dependent, leaf spring; front brakes: Drum), and rear suspension, rear brakes, wheels, clearance, and both weights are not measured on all three.

That also means “the extra money buys a newer platform” is not a claim this catalogue can support. The extra you buy is engine size, peak power, and — only on 2.6 MT — a 250 rpm higher power peak.

Engine choice: 2.1 MT vs 2.4 MT vs 2.6 MT

2.1 MT is the smallest Gasoline V-shaped 4: 2121 cm³, 49 hp / 37 kW at 3250 rpm, No boost, Carburetor, Manual 3, RWD. It is the version to choose if the goal is the least displacement in this model, not the least complexity — complexity (layout, gearbox type, drive, boost, fuel system) is the same as the others. Relative to 2.6 MT you give up 20 hp and 15 kW and about 3.8 hp/L of specific output. Relative to 2.4 MT you give up 10 hp and 7 kW. Use 2.1 MT when you want the Lambda as the smallest of the three listed engines, knowing 0–100, top speed, and mpg for this version are not measured.

2.4 MT sits in the middle: 2375 cm³, 59 hp / 44 kW at 3250 rpm. It is 12.0% larger in displacement than 2.1 MT (2375 ÷ 2121) but 20.4% more powerful (59 ÷ 49). That gap — power rising faster than capacity — is why specific output moves from 23.1 to 24.8 hp/L. Versus 2.6 MT it is 194 cm³ and 10 hp / 8 kW behind, and it still peaks at 3250 rpm rather than 3500. Choose 2.4 MT if you want the middle step without going to the largest bore-and-stroke package, and you accept that torque is not measured so you cannot claim it has more pull at low rpm than 2.1 MT from this data.

2.6 MT is the version the numbers point to if the brief is “most power in this catalogue row”: 2569 cm³, 69 hp / 52 kW at 3500 rpm. It is 21.1% larger than 2.1 MT in displacement (2569 ÷ 2121) but 40.8% stronger in hp. Versus 2.4 MT it is 8.2% larger (2569 ÷ 2375) and 16.9% more powerful (69 ÷ 59). Kilowatts tell the same story: 52 versus 44 is +18.2% for an +8.2% size increase. The 3500 rpm peak is the only rpm difference in the model; both smaller versions are listed at 3250. If you are choosing on listed peak power and on power per litre, 2.6 MT wins both. What it does not automatically win is economy or weight: fuel use, tank, kerb weight, and power-to-weight are not measured.

None of the three is a different gearbox or drive story. Searching “Lambda automatic” or “Lambda AWD” against this data is a dead end: every row is Manual, 3 gears, RWD. There is no Automatic, no extra ratio, no AWD/FWD alternative. “Which gearbox” is not a Lambda question in this generation.

Performance, mpg, and why you cannot pick on 0–100

For 2.1 MT, 2.4 MT, and 2.6 MT: 0–100 is not measured; top speed is not measured; city, highway, and combined consumption are not measured; CO2 and eco class are not measured. A buyer who needs a documented sprint time or an mpg figure cannot rank these versions from this catalogue. The only performance-related numbers that exist are peak hp, peak kW, the rpm of that peak, and displacement.

What you may infer without inventing missing tests: 2.6 MT has 40.8% more listed horsepower than 2.1 MT on the same listed gearbox and drive. That is a large gap in peak output for a three-speed Manual RWD Coupe of one generation. It is still not a 0–100 ranking. Weight is not measured, so horsepower per tonne cannot be calculated. Torque is not measured, so you cannot say which engine is “torquier.” Boost is No on all three, so nobody is buying a supercharged or turbo row.

If the search is “Lambda mpg” or “Lambda fuel consumption,” the honest answer for every version is not measured — not “the small engine must sip less.” Displacement is smaller on 2.1 MT, but without a consumption figure that is not a measured economy win.

Dimensions, weight, tank, wheels: nothing to split on

Kerb weight: not measured (all three). Gross weight: not measured. Ground clearance: not measured. Fuel tank: not measured. Wheel sizes: not measured. Rear suspension: not measured. Rear brakes: not measured. Compression ratio and bore × stroke: not measured.

You cannot choose “the light one,” “the one with more ground clearance,” or “the one with a bigger tank.” Those fields are empty on 2.1 MT, 2.4 MT, and 2.6 MT alike. Front suspension (Dependent, leaf spring) and front brakes (Drum) match. Body type is Coupe for the generation as a whole. The buying decision does not live in the dimensions section; it lives in the engine table.

Power-to-weight would be the usual tie-breaker between 49 / 59 / 69 hp. Without kerb mass it is not measured. Do not treat the larger engine as “heavier” either: mass is not in the data.

Which version to choose

Choose 2.6 MT if the criterion is maximum listed output and maximum specific output in this model: 69 hp / 52 kW, 2569 cm³, ~26.9 hp/L, peak at 3500 rpm. You gain 20 hp over 2.1 MT and 10 hp over 2.4 MT. The last 10 hp costs the least extra capacity (194 cm³ versus 254 cm³ for the previous 10 hp). Same Manual 3, same RWD, same Gasoline Carburetor, same No boost, same Coupe generation years.

Choose 2.4 MT if you want the middle arithmetic: 59 hp / 44 kW, 2375 cm³, ~24.8 hp/L, still 3250 rpm like 2.1 MT. You get +10 hp and +254 cm³ versus the base, and you stay 10 hp and 194 cm³ short of 2.6 MT. It is the only way to split the 20 hp gap in half with a listed version name.

Choose 2.1 MT if you want the smallest listed engine: 49 hp / 37 kW, 2121 cm³, ~23.1 hp/L, 3250 rpm. You are not choosing a simpler transmission, a different drive, or a different generation. You are choosing 20 hp and 448 cm³ less than 2.6 MT. Economy, weight, and 0–100 remain not measured, so this is not a documented “efficient” pick — only a smaller-displacement pick.

Do not choose between generations: there is one (1922–1931, Coupe, 3 versions). Do not choose on gearbox, fuel type, boost, or drive: they do not vary. Do not choose on 0–100, top speed, mpg, kg, tank, or wheels: all not measured.

Practical ranking from the numbers that exist: 2.6 MT first for power and hp/L; 2.4 MT if you want the midpoint; 2.1 MT only if smallest displacement is the actual requirement. Version names to keep exact when you look up a modification page: 2.1 MT, 2.4 MT, 2.6 MT.