Porsche 911 RSR Prototype group 5 (1973)
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SourceChassis 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 |
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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
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) | #107, 6th | #48, in entry list | |||||||||
Martini Racing Team/ Porsche Stuttgart, 911 360 0020 R2 (911/83R) | #9, 3rd | ||||||||||
Martini Racing Team/ Porsche Stuttgart, 911 360 0588 R6 | #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) | #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 0307 R3 | #6, eng ine | ||||||||||
Penske Racing, 911 360 0588 R6 (911/74) | Martini Racing Team/ Porsche Stuttgart | #6, 6th | |||||||||
Brumos Porsche, 911 360 0686 R7 (911/74) | Martini Racing Team/ Porsche Stuttgart | #59, 7th | |||||||||
Brumos Porsche, 911 360 0328 R4 | #59, 1st | #58, in entry list | |||||||||
Total points 66 |
10 | 6 | 23 | 6 | 7 | 5 | 9 | ||||
Statistics | |||||||||||
Works Starts/finishes 16/12 | 2/1 | 2/0 | 2/2 | 3/3 | 1/1 | 2/1 | 2/2 | 2/2 | |||
Driver | Team entries and car number | ||||||||||
Martini Racing Team/ Porsche Stuttgart | |||||||||||
Gijs van Lennep | 81 | 41 | 8 | 6 | 46 | 7 | |||||
Herbert Müller | 81 | 41 | 8 | 6 | 46 | 7 | |||||
George Follmer | 82 | ||||||||||
Manfred Schurti | 82 | 8 | |||||||||
Reinhold Jöst | 47 | ||||||||||
Leo Kinnunen | 9 | ||||||||||
Claude Haldi | 9 | 47, 48 | |||||||||
Günter Steckkönig | 107 | ||||||||||
Giulio Pucci | 107 | ||||||||||
Helmuth Koinigg | 48 | 8 | |||||||||
Penske Racing | |||||||||||
Mark Donohue | 6 | 6 | |||||||||
George Follmer | 6 | 6 | |||||||||
Brumos Porsche | |||||||||||
Peter Gregg | 59 | 59 | |||||||||
Hurley Haywood | 59 | 59 | |||||||||
Hector Rebaque | 58 | ||||||||||
Guillermo Rojas | 58 |
Source
R6 Targa Florio '73 papers
Source
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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Chassis 911 360 0020 R2 in Targa Florio '73
page revision: 50, last edited: 23 Mar 2018 19:23