100-6 1956-59

Classics Monthly - - Marque Guide -

The 100- 6 was in­tro­duced for the 1956 model year, the big­gest change be­ing the in­stal­la­tion of a new Mor­ris Mo­tors six-cylin­der en­gine. Al­though the 2639cc six-cylin­der en­gine promised a 12 per cent rise in power out­put, it ac­tu­ally de­liv­ered less torque – 142 lbf.ft at 2400rpm – against the four pot’s 150 lbf.ft at 2000rpm. Des­ig­nated the BN4 series, the 100- 6’s cabin was re­designed to in­clude two-plus-two seat­ing in the rear. Other changes in­cluded a bon­net that was now hinged at the scut­tle, while restyled bumpers and head­lamp rims en­sured the 100- 6 looked ex­ter­nally dif­fer­ent from the pre­vi­ous model.

In­stalling two small leather­clad rear seats re­sulted in the two six-volt bat­ter­ies lo­cated un­der the rear deck be­ing ditched in favour of a sin­gle 12volt bat­tery re­lo­cated to the right hand side of the boot. Coker’s in­tri­cately de­signed fold­ing/slid­ing wind­screen now gave way to a fixed al­loy framed screen and re­mov­able Per­spex side screens re­placed the pre­vi­ous hinged items.

The 100- 4’s gear­box and rear axle (a higher ra­tio for nonover­drive cars) had been car­ried over to the BD4 and in a bid to in­crease power larger SU 1¾in H6 car­bu­ret­tors and a new 12-port cylin­der head com­plete with sep­a­rate ex­ter­nal in­let man­i­fold re­placed the orig­i­nal six-cylin­der en­gine’s Si­amese ported head. Power out­put went up to 117bhp at 4750 rpm and torque was in­creased to a very use­ful 149lb/ft at 3000rpm and in the autumn of 1957, a small batch of BN4’s were fit­ted with all-round disc brakes. The BN6 two-seat road­ster 100- 6 broke cover in March 1958 and this was pro­duced along­side the two-plus-two BN4 un­til 1959.

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