Assetto Corsa RHK Behind the Wheel of the BRM P83 Monza 1966 Full Course 1 Lap Race 4K.(C)

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The BRM P83:
The BRM P83 was a Formula One racing car designed by Tony Rudd and built by British Racing Motors for the new engine regulations of 1966. It used a highly unorthodox H16 engine which caused problems throughout the car's racing life, and despite the best efforts of Graham Hill and Jackie Stewart took BRM from championship contenders to also-rans, leading it to be regarded alongside the BRM Type 15 as another embarrassing failure for the British marque caused by overcomplicated engineering.

After winning the 1962 Drivers' and Constructors' championships BRM had finished second each year, coming close to the championship in 1964 and having a promising 1965 season with the excellent P261. In 1966 the Formula One regulations with regards to engines were changed from a maximum 1.5 litres normally aspirated to either 3 litres normally aspirated or 1.5 litres supercharged following complaints that the smaller engines used from 1961 to 1965 weren't powerful enough for the premier category of motorsport. As a result, many teams were left looking for a new engine supply while BRM, who built their own very successful V8 engines, had to decide on what manner of new engine to develop to meet the new formula.

The P83 Chassis:
Like contemporary designs such as the Lotus 33 and Cooper T81, the P83 chassis was a riveted monocoque made of Duralumin with integral fuel tanks running down the chassis on either side of the driver. Unlike these cars though, the engine was designed to be a stressed member of the chassis in the same configuration that the much more successful Cosworth DFV would later establish as the norm, and was mated to a 6-speed gearbox, with the gear lever unusually situated to the left of the driver. The front suspension was conventionally arranged, with unequal length double wishbones and inboard coil springs and dampers. The rear suspension consisted of twin radius arms, reversed lower wishbones, single top links and outboard springs and dampers, attached to the gearbox and engine.
The size of the engine gave the car a centre of gravity that was not just rearward but higher than other cars, due to the height of the upper crankshaft above the ground and the need to have the entire engine raised slightly to make room for the lower set of exhausts which left the engine from underneath the car.

1966 Championship Season:
The first outing for the P83 came at the first race of 1966 in Monaco, Stewart trying out the car in practice before driving a P261 to victory in the race. In Belgium both Hill and Stewart practiced with the P83, both opting to use the P261 in the race, Stewart having his infamous crash at Masta which put him out of the next race in France. Two P83s were now available and around the fast Reims circuit Hill set a time which would have been good enough for fourth on the grid, but started eighth in the P261 instead after having gearbox problems.

The P83 was left behind for the next three races while work was done to try to cure the H16's various issues, but for the last three races both cars finally reached the start line, with a third P83 and a P261 taken as spares. At Monza the team had problems all weekend, with even the P261's engine failing at one stage, and in the race Hill's H16 blew on lap one while Stewart had to retire when a leaking fuel tank left him soaked in petrol.

Two cars were entered for the 1966 International Gold Cup at Oulton Park where Stewart qualified third with Hill fourth, but after a promising display with first Stewart and then Hill each leading the race ahead of eventual winner Brabham both cars retired with engine problems.
The 1966 United States Grand Prix offered the largest prize of the year, and Hill and Stewart lined up fifth and sixth on the grid. Hill suffered gearbox problems early on in the race but managed to carry on, while with other cars retiring Stewart found himself in third place by lap 35, a fair way behind Clark's Lotus in second. Hill finally retired with a broken differential on lap 53, and a lap later Stewart also had to retire when a cylinder liner broke. On the following lap the leader Brabham broke a camshaft, allowing Clark to nurse his car home for an incredible first (and it turned out, only) win for the BRM H16 engine.

Hill and Stewart lined up seventh and tenth for the final race of the year in Mexico, both cars leaking oil in practice caused by a leaking oil pressure relief valve that was easily fixed. In the race Hill's engine was misfiring from the start and lasted 18 laps, while Stewart moved up to third trailing smoke as another leak slowly drained all the oil from the engine, retiring after 26 laps. After being second and fifth in the Championship after six rounds in the P261, Hill and Stewart ended the season without adding to their points in fifth and seventh place.

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RHK