Porsche 911 RSR Prototype group 5 (1973)
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Chassis numbers here and here
RSR = Rennsport Racing (Race Sport Racing)

Specifications

8 units built
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Type Porsche Type 911/72, boxer 6 cyl (180o), 4 stroke, petrol engine located longitudinally behind rear axle
Capacity 2808cc
Bore x Stroke (mm) 92.0 x 70.4 mm
Compression ratio 10.3:1
Output power - torgue 308 bhp / 230 KW @ 8000 rpm 290 Nm / 214 ft lbs @ 6300 rpm
Main bearings forged steel crankshaft with 8 plain main bearings 57mm diameter, 52mm big end journal diameter titanium connecting rods, 127.8mm distance center to center, 56mm big end bearing diameter
Materials block: magnesium alloy, 124.5mm bore spacing, Nikasil cylinder lining cylinderhead: aluminium alloy
Cams/valves 2 x 1 overhead camshafts (SOHC), chain driven 2 valves/cyl. - 12 valves total. 49mm inlet valve diameter, 41.5mm exhaust valve diameter.
Aspiration natural with Bosch "pulsed injection" D-Jetronic mechanical Fuel Injection system using Kugelfischer PL Injection pump. Click here and here
Ignition electronic, twin spark, firing order 1-6-2-4-3-5
Cooling system aircooled
Lubrication system dry sump with 1 oil cooler 11 lt
Transmission
Type rear wheel drive Porsche 915 (Tutorial 1, Tutorial 2), 5 speed gearbox
Gearbox ratios 1st: 3.182/1 (35/11)
2nd: 1.778/1 (32/18)
3rd: 1.125/1 (27/24)
4th: 0.821/1 (23/28)
R: 3.325/1
1st: 3.182/1 (35/11)
2nd: 1.834/1 (33/18)
3rd: 1.261/1 (29/23)
4th: 0.962/1 (25/26)
5th: 0.759/1 (22/29)
R: 3.325/1
Diffrential ratio 4.428/1 (31/7), 3.857/1 (27/7), 5.286/1 (37/7) spiral bevel gears limited slip rear differential
Clutch dry single disk 225mm diameter
Chassis-body
Type steel monocoque 911 Type F/G chassis. 2 door coupe steel bodyshell with steel bumpers
Front suspension mc pherson strut with lower L wishbone, coil springs, Bilstein telescopic gas shock absorber and anti-roll bar 15mm diameter
Rear suspension trailing arm with torsion bars, Bilstein telescopic gas shock absorber and anti-roll bar 15mm diameter
Steering system rack and pinion
Brakes ventilated disks all around. Ventilated calipers front and rear dual circuit with servo
Dimensions
length: 4,128 mm (162.5 in) width: 1,896 mm (74.6 in) height: 1,321 mm (52 in)
wheelbase: 2,272 mm (89.4 in) front track: 1,467 mm (57.8 in) rear track: 1,545 mm (60.8 in)
Rims - tires
Weight 820kg
Fuel tank 120 lt

Results in WSCC

Season
911/72 engine
Car entry, chassis number Car number/ result
Dayt Vallel Dijon Monza Spa Targa Florio Nurb Le Man Zeltweg Watkins Glen
Team 24h 6h 1000km 1000km 1000km 1000km 24h 1000km 6h
Martini Racing Team/ Porsche Stuttgart, 911S/T:911 230 0841 -> 911 360 0002 (911/83R) #107T, 6th #48, in entry list
Martini Racing Team/ Porsche Stuttgart, 911 360 0020 R2 (911/83R) #9, 3rd
Porsche Stuttgart/ Sonauto BP Racing, 911 360 0020 R2 Group 4 #48, 14th (8th)
Martini Racing Team/ Porsche Stuttgart, 911 360 0576 R5 (911/83R) Group 4 #40, 10th (3rd)
Martini Racing Team/ Porsche Stuttgart, 911 360 0576 R5 Group 4 #8, 8th (2nd) #26, 9th (1st) #66, acci dent
Martini Racing Team/ Porsche Stuttgart, 911 360 0588 R6 #9, 7th (1st)* #81, eng ine* #41, 5th Penske Racing
Martini Racing Team/ Porsche Stuttgart, 911 360 0588 R6 (911/83R) #8, 1st Penske Racing
Martini Racing Team/ Porsche Stuttgart, 911 360 0588 R6 (911/74) #47, fuel system #7, 8th Penske Racing
Martini Racing Team/ Porsche Stuttgart, 911 360 0686 R7 (911/83R) #107, acci dent in practice #6, 5th Brumos Porsche
Martini Racing Team/ Porsche Stuttgart, 911 360 0686 R7 (911/74) #46, 4th #8, 9th Brumos Porsche
Martini Racing Team/ Porsche Stuttgart, 911 360 0974 R8 #82, eng ine
Penske Racing, 911 360 0588 R6 (911/74) Martini Racing Team/ Porsche Stuttgart #6, 6th (1st)
Brumos Porsche, 911 360 0686 R7 (911/74) Martini Racing Team/ Porsche Stuttgart #59, 7th (2nd)
Brumos Porsche, 911 360 0328 R4 #59, 1st #58, in entry list
Total points
76
10 7 2 7 23 6 7 5 9
Statistics
Works Starts/finishes 21/16 1/1 2/2 1/1 2/0 2/2 4/3 2/1 3/2 2/2 2/2
Driver Team entries and car number
Martini Racing Team/ Porsche Stuttgart
Gijs van Lennep 8 26 81 41 8, T 6 45 7
Herbert Müller 8 26 81 41 8, T 6 45 7
George Follmer 9 82 40 66 9
Willy Kauhsen 9 66 82
Manfred Schurti 82 8
Reinhold Jöst 40 47
Leo Kinnunen 9
Claude Haldi 53 9 47, 48, 76
Günter Steckkönig 107, 108 54, 58
Giulio Pucci 107, 108
Helmuth Koinigg 48 8
Arthur Blank 76
Penske Racing
Mark Donohue 6
George Follmer 6
Brumos Porsche
Peter Gregg 59 59
Hurley Haywood 59 59
Hector Rebaque 58
Guillermo Rojas 58
Porsche Sonauto BP Racing
Peter Gregg 48
Guy Chasseuil 48

*Group 4


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Chassis 911 360 0686 R7
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Chassis 911 360 0686 R7
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Chassis 911 360 0020 R2 in Targa Florio '73
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