Mark 8 - NAGARI

The Bolwell Mk8 was different to previous models in several significant ways:

Graeme Bolwell had come back from a working holiday at Lotus in the UK in late 1966 with plenty of ideas about what could be done with fibreglass and the need to design for the material you are using. Graeme basically became Bolwell’s R&D department and spent two years in a walled off area of the Bolwell factory with a Mk7 developing the new Bolwell Nagari. Graeme effectively threw away the book on making steel cars and designed the Nagari for fibreglass. The biggest single production change was in the manufacture of the whole Nagari body in one piece, instead of making all the pieces, removing them from the moulds and then glassing them all together. The other significant advance was in the use of bobbins (aluminium plugs set in fibreglass) for mounting body parts and body/chassis attaching points

The Nagari doors, with an outer skin and an inner stressed door frame/skin were Lotus Europa inspired but went further and added a unique top section that intruded into the roof area giving better cockpit access. Another of the unique features of the Nagari was the bulging door-line, with the curve of the windscreen continuing into the doors and then sweeping in again as you move toward the back of the car, leaving the rear end narrower than the cabin. The huge curve in the windows didn’t matter because they were to be fixed in place with ventilation via ducts through the dashboard. This again was an idea borrowed from the Europa, but it didn’t take long for Bolwell to conclude that it wouldn’t really work in an Australian summer. The use of a proprietary dash top was another Lotus trick and along with the moulded console trims, made the whole interior look much more professional than the previous models.

Chassis design for the Bolwell Nagari was also influenced by but not directly derived from Lotus, even though it is very similar to the Lotus Elan among others. Basically Bolwell liked the idea of the backbone chassis – the Mk7 had a type of a backbone but in the Nagari they made the chassis a lot stronger as they now had the big Ford V8 engine

New supply arrangements were negotiated with Ford and Ford would take a motor and gearbox fully assembled off the production line for Bolwell. The engines were supplied with Autolite carbies on them but Bolwell replaced them with a 2 barrel Holley 500 carbie. Bolwell had to modify the chassis, headers and so on when Ford later changed from the Windsor V8 to the Cleveland engines. Although the Nagari was designed with Ford V8s as the power plant of choice, a handful of cars were built with Holden 6s and one constructed with a 1500 cc Cortina 4. Many of these variants have received V8 transplants; it now would be highly unusual to find a Nagari without a V8.

One of the other changes for the Nagari was the introduction of special Bolwell mag wheels. The first two piece version had Bolwell centres, which were basically a copy of a Lamborghini Muira and they were bolted onto a steel rim. They looked good but they weren’t very strong, so eventually Bolwell changed to a fully cast one piece wheel.

Nagari production began in 1970 and continued through to 1974, when a number of factors came into play to affect its demise: specifically rising prices and impending stricter ADRs (Australian Design Rules).

Bolwell introduced the soft top Nagari Sports in 1972; not only because it looked so good but also because it was hoped that it would sell a few more cars. Many folk are surprised to learn that the Sports came about quite early in the Nagari lifecycle, at chassis number 47. Bolwell had to make some new moulds but could keep the bonnet and front and rear bumper but still had to make a whole new main body mould, with the roof chopped off. They also had to make a new inner guard and come up with some seat belt mounting points inside the back mudguards. The chassis was strengthened in a few key areas, and a steel tube was incorporated into the rear body section to provide extra strength as well. The doors also had to be modified to remove the window frame, although the small quarter window and upright was retained to add some strength. Space behind the seats in the Sports was increased by moving the rear bulkhead back slightly. This meant that the seat could slide back further for better legroom, and meant that additional space was available behind the seats for coats or small bags or potentially for small passengers. The downside was that the boot space was reduced somewhat. Interior trim and all mechanical specifications were identical to the Nagari coupe.

Many improvements were phased in over the Nagari’s production life, notably: chassis revision for the larger (physically) Cleveland V8s (ie from the original Windsor); adoption of MGB front parking lamp/indicators in place of earlier Cortina units; use of an energy absorbing steering column and flat steering wheel; and adopting a larger bonnet bulge specifically for the larger engines.

Unfortunately Bolwell’s production records for the Nagari have gone missing so there is no real way to quantify the actual numbers of Nagaris, both Coupe and Sports, actually produced by Bolwell. Latest best estimates by Nagari aficionados is that 18 Sports were produced along with 100 Coupes (or GTs) making the total production of Nagaris from 1970 to 1974 a grand total of 118 units.

Bolwell Mk 8 – Dimensions and Specifications
(Sourced from Bolwell promotional materials and Sports Car World Road Test)

DIMENSIONS:
Wheelbase90” (2286mm)
Track Front57” (1448mm)
Track Rear59” (1499mm)
Overall Length158” (4013mm)
Overall Width66” (1676mm)
Overall Height44” (1118mm)
Ground Clearance6” (152mm)

SPECIFICATIONS:
ChassisBackbone type steel chassis
EngineFord 302 ci (4958cc) (351 ci optional). Compression 10.0:1. Holley 2 barrel 500 cfm carburettor.
TransmissionFord “top loader” four speed all synchromesh, remote control mechanism
SuspensionFront – Independent with unequal wishbones, coil spring damper units.
Rear – Live rear axle located with 2 oblique torque arms and 2 trailing arms
Fully adjustable coil spring damper units
SteeringModified Austin 1800 rack & pinion, 3.3 turns lock to lock, turning circle 34 ft
BrakesHydraulic vented 11 1/4” disc front, power assisted. 10” drum rear. Separate circuits.
WheelsBolwell alloy wheels 14” x 6”
Tyres184 x 14 radial ply

PERFORMANCE:
Horsepower220 bhp @ 4600 rpm (Windsor engine)
Torque300 ft/lb @ 2600 rpm
Standing Quarter Mile14.8 seconds
Top Speed 130 mph (209kmh)
Fuel ConsumptionCruising – 24 mpg
Overall – 22 mpg