S800

Honda built the S800 (AS800) from 1966–1970. The S800 carried Honda’s high-revving engineering into one of its first internationally sold sports cars. Its two-seat roadster form and lightweight sports car purpose locate it within a specific chapter of the marque’s performance history.

The focus here is the production S800 roadster at its Japanese specification, excluding S500, S600, coupé-body detail and competition modifications. That scope is important: familiar badges can cover several engines, markets and model years, while road cars and competition derivatives may share a name without sharing a usable technical specification.

The mechanical centre is the AS800E, a 791 cc naturally aspirated inline-4. The period specification represented here is 51 kW (70 PS) and 66 Nm. Those figures stay attached to this configuration rather than blending regional tunes or later revisions.

The compact DOHC four-cylinder uses four carburettors and motorcycle-informed high-speed engineering in a lightweight rear-drive chassis. The installation is longitudinal front engine, rear-wheel drive, working through a 4-speed manual. That combination determines throttle response, traction and the path by which induction, combustion and transmission sound reach the cabin and roadside.

Useful listening markers include high-revving 791 cc DOHC four-cylinder, four carburettors, four-speed manual, open lightweight body. A genuine cold start records cranking, first combustion and the transition to a settled idle; a warm restart is a different event and should be labelled as such.

Under acceleration, microphone position and engine load reveal different layers. An engine-bay or cabin recording can expose induction and valvetrain detail, while an exterior pass gives more weight to exhaust, tyres, turbocharger or supercharger behaviour and the acoustic effect of speed.

The AS800 identity also makes comparisons within the S series family meaningful. Closely related editions may differ in intake hardware, boost control, gearing, catalysts, silencers or mass, so their recordings should not be treated as interchangeable merely because the body shell looks similar.

Surviving examples frequently carry replacement exhausts, wheels, suspension or engine parts. Those cars can still make valuable contributions when the changes are documented; the archive simply needs to distinguish a modified survivor from an evidenced factory-stock reference.

The 1966–1970 production period supplies another boundary for research. Manufacturers revised emissions calibrations, equipment and market availability during model runs, and historic output may appear in PS, kilowatts or regional horsepower standards. Keeping units and market context visible prevents false precision.

Body layout matters to sound as much as specification sheets suggest. The two-seat roadster changes cabin volume, resonance and the listener’s distance from the powertrain. Engine position, driveline and body openings can therefore make related engines feel substantially different in use.

Period photographs establish design and historical context, but appearance alone cannot prove untouched mechanical condition. Originality should be described component by component, especially for intake, forced induction, catalysts, silencers, transmission and final-drive hardware that can alter performance and sound. Service records and dated photographs can make those distinctions clearer without asking readers to accept appearance as proof.

The S800 is therefore best understood as a connected mechanical identity: AS800E, 4-speed manual, rear-wheel drive and the AS800 boundary. Preserving those elements gives readers a useful story now and gives future community recordings an exact historical home.