Porsche 908 group 6 (1968)

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Source

Chassis numbers here and here and here

Specifications

31 units built
Click here and here and here and here
Click here and here for 908K Coupe
Click here for 908 LH Coupe

Type 908, Boxer 8 (180^o) cyl, 4 stroke, petrol engine
2997cc, 85.0 x 66.0 mm
10.4:1
350 bhp / 261 KW @ 8400 rpm
325 Nm / 232 ft lbs @ 6600 rpm
cast aluminium block and aluminium alloy head
9 main bearings
2 valves / cylinder, DOHC chain driven
aspiration: natural with Bosch Kugelfischer mechanical Fuel Injection
firing order 1-8-2-6-4-5-3-7 (since 1969)
aircooled
dry sump
Type 916 6 or 5 speed gearbox
steel or aluminium tubular space frame with plastic body
length, 4839 mm (Lang Heck)
width 1830 mm
height 938 mm
wheelbase: 2300 mm
track f/r: 1486 / 1454 mm
front wheels: 4.25/10.20-15
rear wheels: 5.50/12.20-15
650kg

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Results in WSCC

1968Season

Car entry, chassis number	Car number/ result
	Dayt	Sebring	Brands Hatch	Monza	Targa Florio	Nurb	Spa	Watkins Glen	Zeltweg	Le Man
Team	24h	12h	6h	1000km		1000km	1000km	6h	500km	24h
Porsche System Engineering, 908-003 (LH, 90o crank)				#4, 19th			#T, spare car
Porsche System Engineering, 908-004 (LH, 90o crank)				#5, 11th
Porsche System Engineering, 908-005								#3, wheel bearing	#1, 1st
Porsche System Engineering, 908-006									#2, 8th
Porsche System Engineering, 908-008						#2, 1st		#2, 6th
Porsche System Engineering, 908-009						#1, chassis			#3, 2nd
Porsche System Engineering, 908-010							#6, acci dent
Porsche System Engineering, 908-011							#5, 3rd	#4, over revved	#4, thro ttle
Porsche System Engineering, 908-012 (aluminium)								#1, wheel bearing
Porsche System Engineering, 908-013 (LH aluminium)										#33, 3rd
Porsche System Engineering, 908-014 (LH aluminium)										#34, alter nator
Porsche System Engineering, 908-015 (LH aluminium)										#31, clutch
Porsche System Engineering, 908-016 (LH aluminium)										#32, disqua lified
Total points 54						10	9	5	22	8
Statistics
Starts/finishes 18/9				2/2		2/1	2/1	4/1	4/3	4/1
Driver	Team entries and car number
Porsche System Engineering
Jo Siffert				4		2		1, 2	1	31
Hans Herrmann				4			5	2	3	31
Ludovico Scarfiotti				5		1
Gerhard Mitter				5		1				32
Vic Elford						2	6, T	1	2	32
Rolf Stommelen							5			33
Jochen Neerpasch							6		4	33
Tetsu Ikuzawa								2
Joe Buzzetta								3, 4		34
Richard Attwood								3
Scooter Patrick								3		34
George Follmer								4
Rudi Lins									4

1969

Season

All engines were with new flat plane crankshaft and 1-8-2-6-4-5-3-7 firing order

Car entry, chassis number	Car number/ result
	Dayt	Sebring	Brands Hatch	Monza	Targa Florio	Spa	Nurb	Le Man	Watkins Glen	Zeltweg
Team	24h	12h	6h	1000km		1000km	1000km	24h	6h	1000km
Porsche System Engineering, 908-005						#24T, spare car
Porsche System Engineering, 908-022 (LH aluminium)	#54, cam drive									#3, 7th*
Porsche System Engineering, 908-023 (LH aluminium)	#52, oil pressure
Porsche System Engineering, 908-024 (LH aluminium)	#53, 24th			#T, spare car
Porsche System Engineering, 908-025 (LH aluminium)	#50, cam drive			#7, 2nd		#25, 1st
Porsche System Engineering, 908-026 (LH aluminium)	#51, eng ine			#4, 1st		#10, 3rd
Porsche System Engineering, 908-027 (LH aluminium)				#5, eng ine		#24, dns
Porsche System Engineering, 908-028 (LH aluminium)				#6, 16th		#11, 4th
Porsche System Engineering, 908-029 (LH aluminium)								#22, gear box
Porsche System Engineering, 908-030 (LH aluminium)								#23, acci dent
Porsche System Engineering, 908-031 (LH aluminium)								#64, 2nd
Escuderia Nacional CS	#58, in entry list
Brian Sherwood								#16, in entry list
Total points 47				19		25		9		4
Statistics
Starts/finishes 17/9	5/1			4/3		4/3		3/1		1/1
Driver	Team entries and car number
Porsche System Engineering
Jo Siffert	50			4		25
Hans Herrmann	50			7		11		64
Richard Attwood	51			6
Joe Buzzetta	51
Vic Elford	52			6		10
Brian Redman	52			4, T		25
Udo Schütz	53					24, 24T		23
Gerhard Mitter	53					24, 24T		23
Rolf Stommelen	54					11
Kurt Ahrens, Jr	54			7		10
Gérard Larrousse								64
Rudi Lins								22
Willy Kauhsen								22
Escuderia Nacional CS
Alex Soler-Roig	58
Rudi Lins	58
Pauli Toivonen	58
Racing Team Gesipa
Jürgen Neuhaus										3
Dieter Fröhlich										3

*Racing Team Gesipa entry

1971Season

Car entry	Car number/ result
	Buenos Ayres	Dayt	Sebring	Brands Hatch	Monza	Spa	Targa Florio	Nurb	Le Man	Zeltweg	Watkins Glen
Team	1000km	24h	12h	1000km	1000km	1000km		1000km	24h	1000km	6h
Alexander Nolte								#19, in entry list
Escuderia Montjuich									#24, in entry list
Sepp Greger									#59, in entry list
Peter Wiechert/ Barney Barnes									#60, in entry list
Statistics
Works Starts/finishes 0/0
Driver	Team entries and car number
Escuderia Montjuich
José Ma Palomo									24
Sepp Greger
Ernst Kraus									59
Dieter Basche									59

1972Season
Group 5

Car entry, chassis number	Car number/ result
	Buenos Ayres	Dayt	Sebring	Brands Hatch	Monza	Spa	Targa Florio	Nurb	Le Man	Zeltweg	Watkins Glen
Team	1000km	6h	12h	1000km	1000km	1000km		1000km	24h	1000km	6h
Siffert ATE Racing, 908-013 (LH aluminium)									#60, 3rd
Hollywood Team, 908-021										#12, acci dent
Sepp Greger/ Albert Pfuhl										#10, in entry list
Total points 8									8
Statistics
Works Starts/finishes 2/1									1/1	1/0
Driver	Team entries and car number
Siffert ATE Racing
Reinhold Jöst									60
Michel Weber									60
Mario Casoni									60
Hollywood Team
Luís Pereira Bueno										12
José Renato Catapani										12

1973Season
Group 5

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
Paul Blancpain Racing, 908-018								#2, in entry list
Gelo Racing Team								#63, in entry list
Statistics
Works Starts/finishes 0/0
Driver	Team entries and car number
Paul Blancpain Racing
Reinhold Jöst								2
Mario Casoni								2
Paul Blancpain								2
Gelo Racing Team
Georg Loos								63
Jürgen Barth								63

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Source
908K Coupe
Source
908 LH
Source
Chassis 908-19
Source
908 LH at Le Mans '72
Source
"In the 908s the first 2 cranks tried were 90^o, combined with a 180^o V this makes for an even fire engine, again with a relatively simple exhaust, the last and final iteration was a 180^o(flat or plane) crank and odd fire pattern( where 5 follows 8 and 1 follows 4). This last was chose as the secondary inertial forces for this configuration all cancel. The 90^o crank also has to be heavier due to the necessary counter weights, a flat crank doesn't need the counter weights, it is thus lighter and revs more quickly. Note that the drivers hated the final config even though lap times were as good or better. The first appearance of the 908 was at LeMans practice in April '68, engine vibration above 7k rpm was an issue. 1st race appearance was April '68 at Moza, 3 cars were entered, best(only) finish was 19th. 1st win was at the ADAC-1000 km-Rennen auf der Nürburgring in May '68. Vibration was still an issue hence the experiments with firing order but keeping the crank and cams the same(middle above) and finally the crank change. The change to the 180^o crank was made for Sebring '69 preliminary practice "¹
Click also here

Drawings

Source

Engine

Source
Source

Bosch Kugelfischer fuel injection system

Source

Footnotes

1. Pelican parts forum