1961 Austin Mini Competition Saloon to 'Cooper S' Specification Registration no. 126 BHO Chassis no. AA2S7 94335
Originally a Mini 850, the Cooper S replica offered here has been built to comply with FIA Appendix 'K' regulations. The car's full mechanical specification is far too lengthy to list here but is available for inspection (highly recommended). Highlights include a seam-welded bodyshell; Roll Centre bolt-in roll cage; strengthened sub-frames; up-rated and adjustable dampers; rear anti-roll bar; twin-circuit brake master cylinder; Aeroquip brake lines; and new brake front callipers, discs, Carbon Metallic race pads and Cooper S rear drums.
The engine has been built by Tony Pattison, who has assembled race-winning engines for numerous historic competition cars. It incorporates a non-tappet chest, 1275cc pre-A-Plus block, as allowed by the Appendix K regulations, which is over-bored for a capacity of 1,293cc. A four-bolt centre main bearing cap is fitted together with an Arrow EN40 crankshaft, Arrow 'H'-beam con-rods and Omega forged pistons. Compression ratio is 12.5:1. The camshaft is a Kent 510 cross-drilled to 649 profile with Vernier timing chain set. The cylinder head is a 12G940 casting currently being prepared with Cooper S specification valves, and porting and combustion chambers to FIA specification. Twin 1.5" SU carburettors are mounted on a modified standard Cooper S manifold, while the complete race exhaust system is by Maniflow. The Jack Knight 'dog box' incorporates straight-cut drop gears, a 3.9:1 final drive and new Tran-X limited-slip differential. The remote gear change features a modified KAD quick-shift and reverse lock out mechanism. '126 BHO' rolls on 'Rose Petal' wheels shod with CR65 tyres, and comes with two spares.
The interior is equipped with a Tillit race seat and Willans seat belts, the former mounted on strengthened mounting plinths. Rear seat, door cards and roof lining are installed to give the correct period look, while the rear screen and side windows are Perspex. Switch panels are fitted to the steering column to allow easy reach. The wiring loom is a lightweight bespoke item with circuit breakers mounted in the original switch panel position. A plumbed-in Willans electrical fire extinguishing system is fitted also.
FIA HTP inspection was completed and passed in November 2014 (FIA HTP barcode decal now applied) and the car is described as in generally excellent condition.