The chassis dossier
Factory-record details, original options and a clear boundary between documentary evidence and the car as it stands.
Download PDFTHE TECHNICAL ARCHIVE
The details make the difference.
Beyond the photographs: five original research dossiers, rare primary records and a working laboratory for the 1968 912 Targa.
Read. Compare. Verify.
05 PDFS / 24 PAGES / ENGLISH
Transmission notebook
A-F-M-S-X tooth counts, gear-speed calculations, shift drops and a comparison of conflicting primary sources.
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The Targa patent
Read the original roof mechanism and locate the chassis-specific change point for roof-frame position 60.
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FIA 580 engineering atlas
Cylinder geometry, valve timing, brake references and a page-by-page route through the original 12-page form.
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Fillable inspection record
Twenty-nine editable fields to document identifiers, fitted equipment, photographs and unresolved questions.
Download PDFINTERACTIVE / TRANSMISSION
Move the revs. Watch the ratios.
Change engine speed, tyre circumference, final drive and fifth-gear reference. Recalculate every gear, compare rpm at a target road speed and export your inputs with the results.
Enter the technical laboratory ↗The original sources.
EXTERNAL ARCHIVESUS 3,476,437
Porsche roof patent. Three drawing sheets and the original description; German priority 11 August 1965.
Open the original PDF ↗FIA / CSI 580
The original 912 Targa homologation scan. Twelve pages. Consultation copy, not valid as event documentation.
Open the original PDF ↗PORSCHE PET / KAT 073
Manufacturer parts catalogue covering 1965-1969. The 2017 edition used for the engine, gearing and roof-frame research.
Open the original PDF ↗The five downloadable dossiers are new explanatory works. The archival scans remain on the source websites and are linked, not repackaged as new documents.