1973 Porsche 911 RS (RennSport)
Country of Manufacture: Germany Vin
Model Type: 2 Door Coupe
Body Designer: Ferdinand Alexander “Butzi”
Engine: 2.7 liter (2687cc) developed from the 2.4 liter
“S” engine but with low friction Nikasil coated
aluminum cylinders-unique at the time to the RS and developed
from the 917 racing program. Bosch mechanical fuel injection.
Horsepower: 210 bhp at 6300 rpm
Torque: 255 lb at 5100 rpm
Transmission: Porsche Type 915/08 H pattern 5-Sp. unique
to RS with oil pump recessed into trans cover.
FRONT- MacPherson struts with telescopic Bilstein dampers
and torsion bars. For weight reduction and additional strength
genuine RS’s should also have a forged aluminum front
REAR- Trailing arms with telescopic Bilstein dampers and transverse
torsion bars with a rear axle reinforcing plate welded to
the frame tunnel.
FRONT- Fuchs forged 6”x 15” rims.
REAR- Fuchs forged 7” x 15” rims
FRONT- 282mm discs with aluminum calipers.
REAR- 290mm discs with cast iron calipers.
Top Speed: 152 mph (0-62 mph (100kph) =5.8 secs)
History: The world premiere for the 911 RS was at the
Paris Auto Show in October 1972. The 911 RS is a high performance
derivative of the series production 911. Apart from superficial
differences such as the large side mounted Carrera script
decals, RS’s can be identified by their lower ground
clearance, bigger front apron, unique “ducktail”
rear deck lid spoiler, and most significantly, by their rear
deck lid badging indicating an increased engine capacity from
the stock 2.4 liter to a very potent 2.7 liter unit.
Production: An initial production run 500 was planned
but demand was so great that a second batch of 500 was added
and finally a third batch of 580 to bring the overall total
to 1580. The first 1035 cars built had minimal undercoating
and used lightweight steel panels (roof, doors, front trunk
lid, trunk floor, door sills, rear seat panel, upper and lower
dash board sections, front fenders, rear fenders/side panels).
Genuine RS’s also have lighter Bilstein shock absorbers
(series production cars have Konis), 15mm front and rear stabilizer
bars and a forged aluminum front axle auxiliary sub frame.
Gusset plates provided additional support to the wheel bearing
case on the control arm and a reinforcing plate was also fitted
for further support to the rear axle tube and welded into
place in the vicinity of the frame tunnel in the chassis center.
The last 544 cars were built on the same production line
as the series production 911 and came with regular steel bodies
and full undercoating. RS production should be broken out
into 4 sub categories:
RSH: 17 examples-development/homologation model, extreme
lightweight with narrow wheels and tires (no fender flares)
and no “ducktail” spoiler.
RS Sport (M 471 package): 200 examples (aka “lightweight”model)
with fender flares, front and rear fiberglass bumpers, “ducktail”
spoiler, thinner lightweight glass (with sealed rear side
windows), rubber mats, door panels without pockets and armrests
and with simple Fiat 600 strap door pulls, Recaro lightweight
sport seats, rear seat delete, and minimal undercoating and
RSL (M 472 package) 1308 examples (aka “Touring”
model) with fender flares, steel rear bumper instead of fiberglass,
sport seats and regular series production glass (with opening
rear side windows), rear seats, insulation, carpets and door
panels. Within this group are the both lightweight (up to
chassis # 1035) and regular steel bodies (beginning with chassis
# 1036 through #1580).
RSR (M 491 package) 55 examples. Full blown race car with
engine increased to 2.8 liters (2806.53cc). Multiple changes
were also made to the transmission, suspension and brakes
(from Porsche 917). The body shell was further widened to
accommodate larger wheels and tires (9” & 11”
vs. 6” & 7” on RS and RSL models).
This particular car is an early lightweight steel bodied
(#662 ) RSL “Touring” model. It was exported from
the factory directly to Italy (code JV) and as an export model
has the horizontal side impact door beams introduced on production
series export models in August 1972. With correct chassis,
engine and transmission #’s, the car also features other
genuine RS items including a forged aluminum front axle auxiliary
sub-frame, 15 mm front and rear stabilizer bars and gusset
and reinforcing plates providing additional support to the
wheel bearing case and rear axle tube. The rear “ducktail”
deck-lid also has the correct aluminum sub-frame. Unlike most
RSL “Touring” models this car was built with the
lighter, simpler windup door windows. The original plastic
fuel tank is installed.
The car is still totally original inside and out. The original
paint (color code 131312 Bahia Red) shows considerable patina
with minor “rub through” on front fender tops
to factory “body in white” base primer. The black
interior: dash, seats, door panels, headlining and carpet
are in perfect to near perfect condition.
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