ACCURACY BEFORE VOLUME
A clearer picture of the data
Useful specifications need context: where they came from, what they measure and which variant they describe.
Preserved, with its gaps visible.
JEngines currently contains 565 named Honda and Toyota records. They are legacy reference data, with original sources and rating standards still under review. They are not 565 independently verified engine designs.
Unknown values are displayed as “Not recorded.” Original year strings and manufacturer-specific fields are retained. Repeated codes are kept separate when their records differ.
A source for each specification.
Future additions will identify the source, publication or version, units, market and vehicle application. Conflicting values will remain separate until reviewed.
Vehicle trim variants and combined hybrid or EV system power will not be presented as distinct engine or individual motor specifications.
Sources and review status.
Records can come from manufacturer references or official government datasets. Imported EPA/NHTSA records are clearly labelled as not independently verified. Conflicting figures and unresolved identities are held or shown explicitly; manufacturer checking is not required for every imported record.
Original units and explicit unknowns are preserved. A heritage vehicle’s specification is not generalized to every engine with that code.
Power in kW and horsepower.
Where the source identifies the power unit, we show the original rating and an approximate converted value, marked ≈. Here hp means mechanical horsepower: 1 hp = 0.745699872 kW. Metric horsepower (PS) is a different unit: 1 PS = 0.73549875 kW. These conversions preserve the original motor or vehicle-system scope and do not change the source’s rating standard.
Legacy horsepower labels have not yet been established as mechanical hp or metric PS, so they are retained without a converted estimate. Conversion factors follow NIST’s power-unit reference.