Jensen Healey Engine-Bay
The quest for originality can be demanding, particularly when correct detail is important. One feature of a Jensen which takes time and expertise to get just right, is the engine-bay. Many decades have elapsed since the cars were first built, and in that time all manner of detail may have been changed. The engine-bay of the Jensen-Healey hardly changed over the period the car was in production, which does simplify things for the restorer. The Museum looks at the detail of a Jensen-Healey engine-bay.
Overview of the Jensen-Healey engine-bay
The Jensen-Healey is fitted with the 1973 cc Lotus 907 dual overhead cam, 16-valve all-alloy engine. This multi-valve engine is the first modern dual overhead cam 4 valve per cylinder engine to be mass-produced on an assembly line. This setup puts out approximately 144 bhp (107 kW), topping out at 119 mph (192 km/h) and accelerating from zero to 60 mph in 7.8 seconds (8.1 seconds for the emission controlled U.S. version). The engine is canted over to one side, which allows a lower bonnet line. The twin cam covers are made in cast aluminium with the Jensen-Healey name to the top. The top fins are in exposed aluminium, along with the name, the rest of the casting is finished in black crackle finish. The same style of cam cover was also used by Lotus with their name to the tops. The Lotus cam covers were never installed to engines fitted in a Jensen-Healey, although some owners have changed the Jensen-Healey covers in favour of the Lotus-branded covers.
Cars destined for UK and European distribution contained dual side-draft twin-throat Dell’Orto DHLA carburetors (similar to Weber DCOE carburetors but with improved progression circuits); those exported to the United States had dual side-draft single-throat CD175 Zenith Strombergs in order to meet emissions requirements. Brakes were Girling, with a 7″ Girling servo unit, and Girling master cylinder with brake reservoir bowl fitted to the top.
JENSEN-HEALEY ENGINE-BAY MK.I (First 200 cars)
Engine-bay of Jensen-Healey chassis number ‘10004’ (car built in 1972).
Model expert, and former Jensen-Healey Registrar, Jensen Owners’ Club, Dr David Booth, believes the first 200 cars had the bracket holding the air-can to the body with a welded centre section.
Engine-bay of Jensen-Healey chassis number ‘10042’ (car built in 1972).
Jensen-Healey, chassis number ‘10042’ has been restored by model expert, Dr David Booth. His remit in regard to the car, has been one of originality.
JENSEN-HEALEY ENGINE-BAY MK.I
Engine-bay of Jensen-Healey chassis number ‘10619’ (car built in November 1972).
JENSEN-HEALEY ENGINE-BAY MK.II
The Jensen-Healey engine-bay remained largely unaltered throughout the model’s life. Just into MK.II production a revised cam-belt cover was fitted. The new cam-belt cover was of two-piece construction. Jensen historian, Richard Calver, states this change ocurred from engine number ‘4110’. This being the case, the change to the two-piece cam-belt cover took place in October 1973.
There had been many complaints (particularly from the motoring press) about the length of time required to take the earlier cover off. Motoring journalist, Michael Scarlett, stated the best option was to the leave the cover off. Jensen Motors took the complaints on board, and designed a new two-piece cover. The top part of this new cover could be quickly unbolted, allowing for a cam-belt change. Other minor changes came during late MK.II production, with a viscuous coupling being fitted to the radiator fan, and a revised heater valve assembly, which was fitted between the rocker covers.
Engine-bay of Jensen-Healey chassis number ‘13568’ (car built August 1973). This is typical of early MK.II generation engine-bays.
Engine-bay of Jensen-Healey chassis number ‘15346’ (car built January 1974). This is typical of MK.II generation engine-bays.
Engine-bay of a LHD US Specification Jensen-Healey.This is typical of early to middle generation MK.II engine-bays
Engine-bay of Jensen-Healey chassis number ‘19109’ (car built November 1974). This is typical of late generation MK.II engine-bays
Jensen Healey Engine-Bay
ACKNOWLEDGEMENTS: Dr David Booth, former Jensen-Healey Registrar, Jensen Owners’ Club | Richard Calver | Jason & Paul Lawrence of marque specialists, Rejen. | Helen Newby, Jensen Healey Registrar, Jensen Owners’ Club.
COPYRIGHTS: The Jensen Museum | Helen Newby | Rejen
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