Car Collector International
Classic · 1920s–1930s

Voisin C14 / C28

Gabriel Voisin's aero-engineered cars — sleeve-valve engines, aluminium construction and Art Deco coachwork unlike anything else.

SaloonCoupeAérosport
Car Collector International Editorial
Voisin C14 / C28
Overview

Why this car matters

Gabriel Voisin's automobiles were the work of an aviation engineer applying aircraft thinking to cars. Sleeve-valve engines (eliminating valve gear noise), light aluminium bodywork and bold Art Deco interior design defined the marque. The C14 (1928) and C28 (1936) Aérosport coupes are widely regarded as the marque's most beautiful achievements. Production was always tiny — a few hundred of any given model — and Voisin ceased car production in 1939.

Among the most original engineering and design of the pre-war French era; a Voisin in good order has no real comparison.

Variants

Range and production

VariantYearsProductionNotes
C14 Chartre / Lumineuse1928–1932Sleeve-valve six-cylinder.
C28 Aérosport1936Most celebrated coupe of the marque.
Buyer's Guide

What to look for

Provenance and originality

For pre-war and vintage cars such as the Voisin C14 / C28, provenance is paramount. Chassis and engine number matching, period coachbuilder records, factory build sheets where available, continuous ownership documentation, original handbooks and any competition or concours history are the foundation of value. Aérosport or Lumineuse coachwork, original sleeve-valve engine, continuous history.

Mechanical inspection priorities

Sleeve-valve engines are virtually silent in service but require specialist understanding of sleeve clearance and lubrication. A pre-purchase inspection by a recognised marque specialist should include compression and leak-down testing, magneto and ignition checks, chassis straightness and frame survey, axle and steering wear assessment, brake system review (mechanical or hydraulic per period), and an extended road test on varied terrain to expose carburation, cooling and gearbox issues that only emerge under sustained running.

Body, chassis and originality of coachwork

Pre-war coachwork is rarely truly original after a century of use. Establish whether the body is original to the chassis (period photographs, build records, coachbuilder plates), whether it has been re-bodied at any point, and the standard of any restoration. Quality of timber framing, ash health, panel beating and paint depth are all critical. Concealed structural rot, re-bodies presented as original, and 'tribute' cars built on later or unrelated chassis must be priced accordingly.

Specification and event eligibility

Aérosport coupes and the most theatrical Art Deco coachwork are the leaders; saloons offer the engineering at materially more accessible prices. For vintage cars, event eligibility — Mille Miglia, Goodwood Revival, Pebble Beach, VSCC events, Le Mans Classic — can underwrite a substantial proportion of market value. Verify FIA/FIVA papers, period race history where claimed, and the car's standing with the relevant marque registry before purchase.

Pricing

What to pay

Concours C28 Aérosport
USD$1,800,000 – $3,500,000
GBP£1,330,000 – £2,580,000
EUR€1,500,000 – €2,920,000
Only a few survive; top of the Voisin market.
Excellent C14 / Lumineuse
USD$300,000 – $600,000
GBP£220,000 – £440,000
EUR€250,000 – €500,000
Restored period coachwork.
Standard Voisin saloon
USD$120,000 – $250,000
GBP£90,000 – £185,000
EUR€100,000 – €210,000
Mainstream sleeve-valve cars.

Regional ranges authored independently — each reflects its local market, not an FX conversion

Ownership

Living with it

Typical mileage
300–2,000 miles typical for vintage use; rally cars higher
Service interval
Annual full service; pre-event check before any rally or tour
Annual running cost
$8,000 – $35,000 depending on use, storage and event programme
Fuel economy
10–18 mpg typical; heavy carburetted engines run rich
Insurance
Use a specialist agreed-value vintage policy with declared value reviewed annually. Premiums reflect declared value, storage, event use and driver experience with pre-war machinery.

Maintenance planning

Vintage cars require disciplined preventive maintenance: lubrication regimes, magneto service, carburettor synchronisation, brake adjustment, and timber and trim conservation. A car used regularly and serviced annually by a specialist will outlast a stored example neglected for decades.

Specialist access and parts

Tiny global community of Voisin specialists; parts fabricated as required. Confirm the availability of marque specialists, period-correct fasteners, coachwork trim, instruments and tyres before committing. A car requiring fabricated one-off parts will absorb time and cost that a similar example with active specialist support will not.

Common Problems

Known issues by system

Engine

Knight-licensed sleeve-valve engine smoke and sleeve wear

Major$25,000 – $60,000 (sleeve rebuild)
Symptoms — Heavy blue smoke at idle and on overrun (characteristic of sleeve-valve), reducing compression.
Inspection — Compression test; understand that some smoke is normal; verify sleeve condition with specialist.
Lubrication

High oil consumption inherent to sleeve-valve design

ModerateOperational consideration
Symptoms — Significant oil use; not a fault unless excessive (>1 litre per 100 miles).
Inspection — Establish baseline consumption; verify oil pressure remains correct.
Coachwork

Voisin aerodynamic / aluminium body originality

CriticalValue impact: 40–60%
Symptoms — Voisin bodies are distinctive and frequently replicated.
Inspection — Verify with Voisin marque archives and period photographs.
Parts

Sleeve-valve specialists almost non-existent

MajorVariable
Symptoms — Engine rebuilds require unique expertise.
Inspection — Identify specialist before purchase; budget for long lead times.
Valuation

Current value bands by region

Concours
USD
$2,500,000
GBP
£1,850,000
EUR
€2,100,000
+1% 12-mo
Excellent
USD
$420,000
GBP
£310,000
EUR
€350,000
0% 12-mo
Good
USD
$170,000
GBP
£125,000
EUR
€140,000
0% 12-mo

Each region quoted in its local currency — independent market readings, not FX conversions

A connoisseur's market; the engineering and aesthetic of the cars increasingly recognised at top-tier concours.

Auctions

Recent results

DateAuctionCarMileageResult
2024-08-16
Gooding & Co.
Pebble Beach
1936 C28 Aérosport
$2,150,000
Sold
Investment

Long-term outlook

Strong HoldHorizon: 10+ years

Genuinely original engineering; finite production. Top examples increasingly demanded by sophisticated collectors.

Recommended

The trusted network

Specialists

  • Voisin marque specialist
    View →
    UK / Europe
    Voisin C14 / C28 restoration, mechanical service and originality reviews.
  • Pre-war coachwork specialist
    View →
    International
    Timber framing, ash conservation, panel beating and period-correct paint for pre-war coachwork.
  • Concours preparation studio
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    International
    Concours preparation, detailing and event support for pre-war and vintage cars.
  • Hagerty
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    USA / UK / EU
    Agreed-value collector insurance specialising in pre-war and vintage cars.
  • Lockton Performance
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    UK / EU
    Specialist agreed-value cover for significant pre-war and competition cars.

Storage

  • Windrush Car Storage
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    Cotswolds, UK
    Climate-controlled storage and collection management for pre-war and classic cars.
  • Autovault
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    Bicester, UK
    Secure climate-controlled storage at Bicester Heritage with inspection programmes.
  • Classic Car Club Manhattan
    View →
    New York, NY
    Secure urban storage for collector and pre-war cars.

Transport

  • CARS UK
    View →
    UK & Europe
    Enclosed concours and event transport for pre-war and vintage machinery.
  • Reliable Carriers
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    USA (national)
    Enclosed coast-to-coast transport for pre-war American and European cars.
  • FERRLOG
    View →
    Italy / Europe
    Air-ride enclosed transport for Italian and European collector cars.

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The valuation figures in this guide are for research purposes only and do not constitute financial or investment advice. See our full disclaimer.