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Porsche flat-twelve engine

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had on the series. The further evolution of the 917, the 917/30 with revised aerodynamics, a longer wheelbase and an even stronger 5.4-liter engine with around 1,100 horsepower (820 kW) in race trim, won the 1973 edition winning all races but two when Charlie Kemp won the Mosport race and George
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wood, some methods were not simple, such as using the tubular frame itself as oil piping to the front oil cooler. By 1971, the original 4.5-liter engine, which had produced around 520 hp in 1969, had been enlarged through 4.9-liters (600 hp) to 5-liters and produced a maximum of
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had bought a used 512S chassis that was dismantled and rebuilt beyond M specification. The car was specially tuned for long races, receiving many unique features among which were a larger rear wing and an aviation-inspired quick refueling system. The engine was tuned by
580:'s in Zandvoort pushed the SCCA to introduce a 3 miles per U.S. gallon maximum fuel consumption rule for 1974. Due to this change, the Penske 917/30 competed in only one race in 1974, and some customers retrofitted their 917/10K with naturally aspirated engines. 583:
The 917/30 was the most powerful sports car racer ever built and raced. The 5.374-litre 12 cylinder (90.0 x 70.4 mm) twin-turbocharged engine could produce around 1,100 bhp (820 kW) at 7,800 rpm in race trim. The 917/30 dominated the
525:, Porsche decided against developing a new high power engine that could keep up with the F1-based engine designs of the competition — at least in naturally aspirated form. In 1976 they would return to sport-prototype racing with the turbocharged 540:
Challenge. For that series, larger and more powerful engines were needed. Although a 16-cylinder engine with about 750 hp (560 kW) was tested, a turbocharged 12-cylinder engine with comparable power output was ultimately used.
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and Helmuth Bott. Power came from a new 4.5-litre air-cooled engine designed by Mezger, which was a combination of 2 of Porsche's 2.25L flat-6 engines used in previous racing cars. The 'Type 912' engine featured a 180°
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The favorite team to win, Gulf-backed John Wyer Automotive, lined up three 917Ks, two with the 4.9-liter engine, and one with the 4.5-liter unit. Two 917 LH were entered in Le Mans, one in white and red trim by
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and exotic alloys that had been developed for lightweight "Bergspider" hill climb racers. Other methods of weight reduction were rather simple, such as making the gear shift knob out of
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won the rest. Most of the opposition was made of private 917/10K as McLaren, unable to compete against the 917 turbos, had already left the series to concentrate on
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from the team and media. At the end it was the red and white #23 917K of Porsche Salzburg, with the standard 4.5-litre engine, carefully driven by
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The domination of Gulf-Wyer and Martini Porsches in 1971 was overwhelming. The only potential challenger to the 917 appeared early in the season:
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through the pouring rain, that finally scored the first overall win at Le Mans, in a wet race that saw only 7 ranked finishers.
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series during the 1973 season. The 917 was also the only championship-winning car in Can-Am not to be powered by Chevrolet.
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After their successes with the 917 mainly in Europe, Porsche instead decided to focus on the North American markets and the
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As the new rules for the 3-liter prototypes were not favorable to their existing low-weight, low-power
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cylinder layout, twin overhead camshafts driven from centrally mounted gears and twin
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The 917 and its engine's domination, the oil crisis, and fiery tragedies like
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The engine was designed by chief engineer Hans Mezger under the leadership of
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V8 specialist Traco and able to deliver more than 600 hp (450 kW).
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in rather low 15th spot, but they did not drive after their own car failed.
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It was Porsche's first 12-cylinder engine and used many components made of
777:"Gaze in Wonder at This Porsche 917/30 Flat-12 Fresh out of Canepa's Shop" 729:
Simanaitis, Dennis (November 2012). "1972 Porsche L&M 917/10 Spyder".
716:"Gaze in Wonder at This Porsche 917/30 Flat-12 Fresh out of Canepa's Shop" 1558: 1553: 449: 366: 332: 320: 893: 873: 831: 659: 434: 393: 158: 153: 124: 883: 585: 537: 515: 482: 374: 866: 457: 618:"Watch a Porsche 917 engine get torn down and rebuilt in minutes" 903: 856: 304: 277: 263: 253: 235: 225: 215: 804: 688:"The 1600-HP Porsche 917/30 Can-Am Spyder Sounds the Business" 15: 660:"Time-Lapse of a Porsche Flat-12 Rebuild – Engine Swap Depot" 800: 791:"I Bet You Didn't Know Porsche Built a 16-Cylinder Engine" 632:"I Bet You Didn't Know Porsche Built a 16-Cylinder Engine" 480:
The car with the 4.5L engine gained the nickname of the
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This broke the five-year stranglehold 118:Reciprocating internal combustion engine 609: 1826:Porsche Experience Center Franciacorta 7: 750:Wouter Melissen (9 September 2009). 44:adding citations to reliable sources 311:Multiport Mechanical Fuel Injection 400:, and later an extremely powerful 14: 1821:Highly Innovative Fuels Australia 1838: 1837: 152: 20: 573:(and USAC, for several years). 31:needs additional citations for 914:Volkswagen Commercial Vehicles 1: 565:Follmer won Road Atlanta and 55:"Porsche flat-twelve engine" 1682:Robert Eberan von Eberhorst 1905: 1687:Fritz Huschke von Hanstein 421: 200:5.4 L (5,374 cc) 198:5.0 L (4,999 cc) 196:4.5 L (4,494 cc) 1884:Gasoline engines by model 1833: 1791:Porsche Rennsport Reunion 1303:Carrera Cup North America 1298:Carrera Cup Great Britain 852:Volkswagen Passenger Cars 552:won the 1972 series with 414:; between 1969 and 1973. 280:, two-valves per cylinder 131: 939:718 Boxster/Cayman (982) 1806:Porsche Club of America 1752:Hans von Veyder-Malberg 1534:List of Porsche engines 1308:Carrera Cup Scandinavia 1738:Franz Xaver Reimspiess 1288:Australian Carrera Cup 1869:Porsche in motorsport 422:Further information: 396:produced a series of 1811:Porsche type numbers 40:improve this article 1816:Porsche VIN numbers 1781:Porsche Engineering 1293:Carrera Cup Germany 1215:Vision Gran Turismo 1200:Boxster E Prototype 793:. 15 February 2021. 756:ultimatecarpage.com 634:. 15 February 2021. 398:naturally-aspirated 1677:Wolfgang Dürheimer 1641:Wendelin Wiedeking 1313:Carrera Cup France 1034:GT1 Straßenversion 690:. 18 January 2019. 405:flat-twelve engine 1851: 1850: 1743:Adolf Rosenberger 1664: 1663: 1584:Ferdinand Porsche 1520: 1519: 1233: 1232: 732:Sports Car Market 402:twin-turbocharged 391: 390: 297:Twin-turbocharged 116: 115: 108: 90: 1896: 1879:Engines by model 1841: 1840: 1766:Volkswagen Group 1609:Wolfgang Porsche 1572: 1512:Porsche Junioren 1283:Porsche Supercup 1271: 929: 840:Volkswagen Group 825: 818: 811: 802: 795: 794: 787: 781: 780: 773: 767: 766: 764: 762: 747: 741: 740: 726: 720: 719: 712: 706: 705: 698: 692: 691: 684: 678: 677: 670: 664: 663: 656: 650: 649: 642: 636: 635: 628: 622: 621: 614: 578:Roger Williamson 467:Porsche Salzburg 412:sports prototype 383:(475–1,966  365:(388–1,193  157: 156: 136: 121: 111: 104: 100: 97: 91: 89: 48: 24: 16: 1904: 1903: 1899: 1898: 1897: 1895: 1894: 1893: 1854: 1853: 1852: 1847: 1829: 1776:Porsche Holding 1755: 1660: 1651:Matthias Müller 1637:Heinz Branitzki 1613: 1594:Ferdinand Piëch 1563: 1526: 1516: 1498: 1489:RS Spyder (9R6) 1317: 1260: 1229: 1116: 968: 918: 862:Audi Sport GmbH 844: 842: 834: 829: 799: 798: 789: 788: 784: 775: 774: 770: 760: 758: 749: 748: 744: 728: 727: 723: 714: 713: 709: 700: 699: 695: 686: 685: 681: 672: 671: 667: 658: 657: 653: 644: 643: 639: 630: 629: 625: 616: 615: 611: 606: 594: 504:Richard Attwood 502:and Englishman 475:Richard Attwood 430:Ferdinand Piëch 426: 420: 379:350–1,450  361:520–1,600  257: 229: 219: 199: 197: 151: 119: 112: 101: 95: 92: 49: 47: 37: 25: 12: 11: 5: 1902: 1900: 1892: 1891: 1886: 1881: 1876: 1871: 1866: 1856: 1855: 1849: 1848: 1846: 1845: 1834: 1831: 1830: 1828: 1823: 1818: 1813: 1808: 1803: 1798: 1796:Porsche Design 1793: 1788: 1786:Porsche Museum 1783: 1778: 1773: 1768: 1763: 1761: 1757: 1756: 1754: 1753: 1750: 1748:Norbert Singer 1745: 1740: 1735: 1730: 1725: 1720: 1715: 1710: 1705: 1700: 1697: 1692: 1689: 1684: 1679: 1674: 1671: 1665: 1662: 1661: 1659: 1658: 1653: 1648: 1643: 1638: 1635: 1632: 1627: 1625:Ernst Fuhrmann 1621: 1619: 1615: 1614: 1612: 1611: 1606: 1601: 1596: 1591: 1586: 1580: 1578: 1576:Porsche family 1569: 1565: 1564: 1562: 1561: 1556: 1551: 1546: 1541: 1536: 1530: 1528: 1522: 1521: 1518: 1517: 1515: 1514: 1508: 1506: 1500: 1499: 1497: 1496: 1491: 1486: 1481: 1476: 1471: 1466: 1461: 1456: 1451: 1446: 1441: 1436: 1431: 1426: 1421: 1416: 1411: 1406: 1401: 1396: 1391: 1386: 1381: 1376: 1371: 1366: 1361: 1356: 1351: 1346: 1341: 1336: 1331: 1325: 1323: 1319: 1318: 1316: 1315: 1310: 1305: 1300: 1295: 1290: 1285: 1279: 1277: 1268: 1262: 1261: 1259: 1258: 1255: 1250: 1247: 1241: 1239: 1235: 1234: 1231: 1230: 1228: 1227: 1222: 1217: 1212: 1207: 1202: 1197: 1192: 1187: 1182: 1177: 1172: 1167: 1162: 1157: 1152: 1147: 1142: 1137: 1135:Lohner–Porsche 1132: 1126: 1124: 1118: 1117: 1115: 1114: 1100: 1095: 1077: 1072: 1067: 1062: 1057: 1052: 1047: 1042: 1037: 1031: 1026: 1021: 1016: 1011: 1006: 1001: 992: 987: 982: 976: 974: 970: 969: 967: 966: 961: 956: 951: 946: 941: 935: 933: 932:Current models 926: 920: 919: 917: 916: 911: 906: 901: 896: 891: 886: 881: 876: 871: 870: 869: 864: 854: 848: 846: 843:marques & 836: 835: 830: 828: 827: 820: 813: 805: 797: 796: 782: 779:. 18 May 2020. 768: 742: 721: 718:. 18 May 2020. 707: 693: 679: 665: 651: 637: 623: 608: 607: 605: 602: 601: 600: 593: 590: 554:George Follmer 461:630 hp. 419: 416: 389: 388: 377: 371: 370: 359: 353: 352: 348: 347: 342: 340:Cooling system 336: 335: 330: 324: 323: 318: 314: 313: 308: 301: 300: 299:; 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A. 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Porsche

Manufacturer
Germany
Porsche
Configuration
flat-12
Displacement
Cylinder bore
mm
in
mm
in
mm
in
Piston stroke
mm
in
mm

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