Saturday 14 March 2009

Rootes 1966 Hillman Imp by Fraser Racing


The flag of Scotland,named the Saltaire


What a nice and rather original picture,note the widened steel rims used before Minilights became the only choice for race and rally teams,they have probably been fitted with Dunlops R7 race tires?note also the external door hinges,indicating that they had taken the heavy (28kgs each) steel door sets off and moved to GRP (glass reinforced plastic)this was a large weight saving when all the window glass,excepting the front screen was replaced by clear plastic sheet.With the doors and the glass weight saving,it will have been around 75 kgs,that is around 12% of the road cars weight,which is a massive amount of power to weight saving on a race car.The front bonnet vents also indicate a move to the front mounted water radiator,this increased the cooling water but also moved weight forward,which helped balance the car.This car will have been fitted with a 998cc Hillman Imp block that Rootes Competitions developed,with a full race inlet and exhaust manifold,twin Weber dcoe 40 carburetors,an R20 or R23 camshaft,power available went from 38 hp to a massive 105hp,which is an increase of 275 percent!

Technical stuff:

The Group 5 regulations permit extensive mechanical modifications, but insist upon the body remaining standard - no lightening or changing of the shape.
Fraser Imp
Group 5, 1967
Engine size
Bore x stroke (mm)
Max. power
Rpm
Compression ratio
Carburetion
Gearbox ratios
Synchromesh on
Anti roll bars at
Brakes
Road wheels 998
72.5 x 60.3
115
9.000
11.0
2 Webers
5 gears
none
F & R
Front disc
7J x 13in.
Engine will not run smoothly below 4,000rpm, useful torque range starts at 5,000. They kept it between 7,000 and 9,300

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