150:
288:) the bore pitch is additionally extended to allow more material between the main bearing webs in the block. For example, in an L6 the first pair (#1 & 2), center pair (#3 & 4), and rear pair (#5 & 6) of cylinders that share a pair of main bearings have a smaller pitch than between #2 & 3 and #4 & 5 that "bridge" a main bearing.
292:
dimension retained from its predecessor. The bore diameter is frequently increased to the limit of minimal wall thickness, the water passage is eliminated between each pair of adjacent cylinders, the deck height is increased to accommodate a longer stroke, etc. but in general if the bore pitch is the same, the engines are related.
291:
Since the start-up expense of casting an engine block is very high, this is a strong incentive to retain this dimension for as long as possible to amortize the tooling cost over a large number of engines. If and when the engine is further refined, modified or enlarged, the bore pitch may be the only
268:
In addition, the positions of the main bearings must be between individual cylinders (L4 with 5 main bearings, or L6 with 7 main bearings - only one rod journal between main bearings), or between adjacent pairs of cylinders (L4 with 3 main bearings, L6 or V6 with 4 main bearings, or V8 with 5 main
299:
V8, first introduced in 1956, was gradually increased in size by bore and stroke to 326" by 1959, then received a drastic make-over in 1964 to conventional "wedge" combustion chambers, then modified again for stud-mounted rocker arms, and finally underwent an even greater re-design to become the
264:
The bore pitch is always larger than the inside diameter of the cylinder (the bore and piston diameter) since it includes the thickness of both cylinder walls and any water passage separating them. This is one of the first dimensions required when developing a new engine, since it limits maximum
308:"Hybrid" is the term commonly used to identify an engine modified for high performance by adapting a cylinder head from another (sometimes completely different) brand, size, model or type engine. Note: using a later head of the same engine "family" isn't a true hybrid, but mere modernization.
311:
In some cases, two heads from the donor (source) engine are joined end-to-end to match the number of cylinders on the subject engine (such as using three cylinders each of two V8 heads on a
Chevrolet inline-six).
265:
cylinder size (and therefore, indirectly, maximum displacement), and determines the length of the engine (L4, 6, 8) or of that bank of cylinders (V6, V8 etc.).
1105:
436:
1820:
96:, determined by dividing the bore by the stroke, traditionally indicated whether an engine was designed for power at high engine speeds (
1098:
429:
1980:
1853:
1990:
1004:
1248:
1886:
1659:
1091:
257:
is the distance between the centerline of a cylinder bore to the centerline of the next cylinder bore adjacent to it in an
222:
1555:
422:
194:
943:
1550:
261:. It's also referred to as the "mean cylinder width", "bore spacing", "bore center distance" and "cylinder spacing".
241:
1698:
179:
2014:
1926:
201:
368:
1880:
1985:
1629:
621:
175:
171:
17:
860:
1874:
1273:
918:
300:
modern 5.7 liter hemi. All of these engines retain the original 4.460" bore pitch distance set down in 1956.
208:
1861:
1649:
502:
1999:
1717:
1689:
1573:
1185:
1128:
1588:
190:
2055:
1467:
445:
273:
258:
2019:
2008:
1866:
1565:
1178:
1054:
968:
933:
913:
865:
773:
1793:
1725:
1049:
890:
599:
160:
2029:
2024:
1945:
1814:
1669:
1614:
1336:
1292:
824:
285:
281:
164:
1832:
1593:
109:
2034:
1932:
1806:
1773:
1654:
1356:
1305:
1243:
646:
315:
Identical or extremely similar bore pitch is what makes this possible, or (almost) impossible.
97:
57:
1899:
1624:
1545:
1518:
1315:
1233:
1143:
763:
604:
277:
125:
105:
1959:
1644:
1583:
1444:
1310:
1258:
1195:
1148:
758:
530:
31:
8:
1953:
1487:
1361:
1278:
1268:
908:
806:
536:
335:
215:
53:
1449:
829:
626:
1750:
1598:
1537:
1492:
1472:
1459:
1439:
1421:
1366:
1320:
1190:
1133:
631:
571:
522:
330:
296:
47:
393:
1826:
1787:
1513:
1431:
1401:
1253:
923:
880:
839:
788:
753:
674:
661:
129:
1732:
1674:
1482:
1477:
1391:
1346:
1034:
745:
594:
551:
1918:
1767:
1739:
1416:
1238:
1228:
1138:
900:
870:
725:
492:
2049:
1706:
1679:
1578:
1497:
1333:
1072:
963:
956:
778:
710:
705:
669:
586:
526:
477:
414:
104:
at lower engine speeds. The term "bore" can also be applied to the bore of a
1907:
1664:
1411:
1396:
1351:
1205:
1200:
1114:
689:
684:
651:
556:
546:
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133:
93:
1759:
1330:
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636:
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1781:
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1220:
1210:
1039:
999:
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783:
715:
641:
581:
512:
325:
1634:
1619:
994:
735:
730:
517:
497:
149:
1523:
1017:
1013:
885:
616:
541:
507:
43:
1044:
928:
1083:
1639:
1376:
855:
834:
611:
561:
101:
1158:
1009:
456:
394:"What Is Bore-Stroke Ratio and Square Engine Design?"
272:
In some older engines (such as the
Chevrolet Gen-2 "
269:
bearings - two rod journals between main bearings).
2047:
444:
1099:
430:
369:"Square, Oversquare and Undersquare engines"
178:. Unsourced material may be challenged and
1106:
1092:
437:
423:
242:Learn how and when to remove this message
503:Crankcase ventilation system (PCV valve)
1981:Glossary of steam locomotive components
115:
14:
2048:
1087:
418:
176:adding citations to reliable sources
143:
27:Diameter of a piston engine cylinder
24:
1833:National Museum of Scotland engine
295:As an example of development, the
25:
2067:
1113:
2015:List of steam technology patents
148:
605:Overhead valve (pushrod) layout
303:
2000:Murdoch's model steam carriage
1986:History of steam road vehicles
386:
361:
348:
13:
1:
1927:Murray's Hypocycloidal Engine
342:
139:
60:and the number of cylinders:
56:is calculated based on bore,
1650:Return connecting rod engine
7:
1574:Condensing steam locomotive
356:Motor Automotive Technology
354:Schwaller, Anthony (1999).
318:
10:
2072:
1881:"Coalbrookdale Locomotive"
446:Internal combustion engine
259:internal combustion engine
1973:
1944:
1917:
1898:
1887:"Pen-y-Darren" locomotive
1852:
1805:
1758:
1749:
1716:
1697:
1688:
1607:
1564:
1556:Single- and double-acting
1536:
1506:
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1384:
1375:
1291:
1219:
1166:
1157:
1121:
1063:
1027:
987:
942:
914:Diesel particulate filter
899:
866:Idle air control actuator
848:
815:
807:Engine control unit (ECU)
797:
744:
698:
660:
580:
465:
452:
297:Chrysler 277" polyspheric
1726:Newcomen Memorial Engine
979:Viscous fan (fan clutch)
891:Throttle position sensor
600:Overhead camshaft layout
2030:Timeline of steam power
2025:Stationary steam engine
1908:Woolf's compound engine
1815:Soho Manufactory engine
1670:Steeple compound engine
1337:straight line mechanism
518:Core plug (freeze plug)
2035:Water-returning engine
2009:Lean's Engine Reporter
1782:Chacewater Mine engine
1655:Six-column beam engine
1875:London Steam Carriage
278:GMC straight-6 engine
85:× bore ) × stroke × n
1821:Bradley Works engine
1645:Reciprocating engine
1468:Babcock & Wilcox
1311:Centrifugal governor
759:Compression ignition
282:Buick Straight-eight
172:improve this section
124:also applies to the
116:In steam locomotives
110:steam engine pistons
1362:Sun and planet gear
909:Catalytic converter
398:www.carbiketech.com
336:Engine displacement
106:locomotive cylinder
54:Engine displacement
1862:Richard Trevithick
1460:Water-tube boilers
1274:Gresley conjugated
1035:Knocking / pinging
627:Combustion chamber
358:. Delmar, New York
286:Chrysler "Slant 6"
276:" inline-six, the
191:"Bore" engine
2056:Engine technology
2043:
2042:
1969:
1968:
1848:
1847:
1532:
1531:
1432:Fire-tube boilers
1287:
1286:
1081:
1080:
1050:Stratified charge
817:Electrical system
799:Engine management
632:Compression ratio
572:Starter ring gear
471:rotating assembly
331:Compression ratio
252:
251:
244:
226:
16:(Redirected from
2063:
1993:fardier à vapeur
1827:Whitbread Engine
1788:Smethwick Engine
1756:
1755:
1695:
1694:
1514:Feedwater heater
1382:
1381:
1164:
1163:
1108:
1101:
1094:
1085:
1084:
924:Exhaust manifold
789:Spark plug wires
675:Boost controller
662:Forced induction
439:
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130:steam locomotive
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68:
21:
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2044:
2039:
1965:
1940:
1913:
1894:
1844:
1801:
1745:
1733:Fairbottom Bobs
1718:Newcomen engine
1712:
1684:
1630:Expansion valve
1603:
1589:Watt's separate
1560:
1528:
1502:
1454:
1426:
1371:
1347:Parallel motion
1283:
1234:Stephenson link
1215:
1153:
1122:Operating cycle
1117:
1112:
1082:
1077:
1059:
1055:Top dead centre
1023:
983:
938:
895:
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818:
811:
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793:
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694:
656:
612:Tappet / lifter
595:Flathead layout
585:
576:
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373:www.motoetc.com
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64:displacement =
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11:
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1779:
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1768:Kinneil Engine
1764:
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1747:
1746:
1744:
1743:
1740:Elsecar Engine
1737:
1729:
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1720:
1714:
1713:
1711:
1710:
1703:
1701:
1692:
1686:
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1662:
1660:Steeple engine
1657:
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1627:
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1617:
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1604:
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1527:
1526:
1521:
1519:Feedwater pump
1516:
1510:
1508:
1504:
1503:
1501:
1500:
1495:
1490:
1485:
1480:
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1419:
1414:
1409:
1404:
1399:
1394:
1388:
1386:
1385:Simple boilers
1379:
1373:
1372:
1370:
1369:
1367:Watt's linkage
1364:
1359:
1354:
1349:
1344:
1339:
1328:
1323:
1318:
1316:Connecting rod
1313:
1308:
1303:
1297:
1295:
1289:
1288:
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1284:
1282:
1281:
1276:
1271:
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1217:
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1141:
1136:
1131:
1125:
1123:
1119:
1118:
1111:
1110:
1103:
1096:
1088:
1079:
1078:
1076:
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1070:
1064:
1061:
1060:
1058:
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1047:
1042:
1037:
1031:
1029:
1025:
1024:
1022:
1021:
1007:
1002:
997:
991:
989:
985:
984:
982:
981:
976:
971:
966:
960:
959:
954:
948:
946:
944:Cooling system
940:
939:
937:
936:
931:
926:
921:
916:
911:
905:
903:
901:Exhaust system
897:
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888:
883:
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871:Inlet manifold
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733:
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726:Fuel injection
723:
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569:
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559:
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493:Connecting rod
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419:
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400:. 28 June 2017
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117:
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63:
26:
18:Bore (engines)
9:
6:
4:
3:
2:
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2051:
2036:
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1870:
1869:
1868:Puffing Devil
1865:
1864:
1863:
1860:
1859:
1857:
1855:
1854:High-pressure
1851:
1840:
1837:
1834:
1831:
1828:
1825:
1822:
1819:
1816:
1813:
1812:
1810:
1808:
1807:Rotative beam
1804:
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1789:
1786:
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1721:
1719:
1715:
1708:
1707:Savery Engine
1705:
1704:
1702:
1700:
1696:
1693:
1691:
1687:
1681:
1680:Working fluid
1678:
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1360:
1358:
1357:Rotative beam
1355:
1353:
1350:
1348:
1345:
1343:
1340:
1338:
1335:
1334:hypocycloidal
1332:
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1319:
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1116:
1115:Steam engines
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957:Water cooling
955:
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949:
947:
945:
941:
935:
934:Oxygen sensor
932:
930:
927:
925:
922:
920:
917:
915:
912:
910:
907:
906:
904:
902:
898:
892:
889:
887:
884:
882:
879:
877:
874:
872:
869:
867:
864:
862:
859:
857:
854:
853:
851:
849:Intake system
847:
841:
840:Starter motor
838:
836:
833:
831:
828:
826:
823:
822:
820:
814:
808:
805:
804:
802:
796:
790:
787:
785:
782:
780:
779:Ignition coil
777:
775:
772:
770:
767:
765:
762:
760:
757:
755:
752:
751:
749:
747:
743:
737:
734:
732:
729:
727:
724:
722:
719:
717:
714:
712:
711:Petrol engine
709:
707:
706:Diesel engine
704:
703:
701:
697:
691:
688:
686:
683:
681:
678:
676:
673:
671:
670:Blowoff valve
668:
667:
665:
663:
659:
653:
650:
648:
645:
643:
640:
638:
635:
633:
630:
628:
625:
623:
620:
618:
615:
613:
610:
609:
606:
603:
601:
598:
596:
593:
592:
590:
588:
587:Cylinder head
583:
579:
573:
570:
568:
565:
563:
560:
558:
555:
553:
550:
548:
545:
543:
540:
538:
535:
532:
528:
524:
521:
519:
516:
514:
511:
509:
506:
504:
501:
499:
496:
494:
491:
489:
486:
484:
481:
479:
478:Balance shaft
476:
475:
473:
468:
464:
460:
458:
451:
447:
440:
435:
433:
428:
426:
421:
420:
417:
399:
395:
389:
374:
370:
364:
357:
351:
347:
337:
334:
332:
329:
327:
324:
323:
316:
313:
309:
301:
298:
293:
289:
287:
283:
279:
275:
270:
266:
262:
260:
256:
246:
243:
235:
232:November 2023
224:
221:
217:
214:
210:
207:
203:
200:
196:
193: –
192:
188:
187:Find sources:
181:
177:
173:
167:
166:
162:
157:This section
155:
151:
146:
145:
137:
135:
131:
127:
123:
113:
111:
107:
103:
99:
95:
62:
59:
58:stroke length
55:
51:
49:
45:
41:
40:cylinder bore
37:
33:
32:piston engine
19:
2020:Modern steam
2007:
1992:
1954:Porter-Allen
1933:
1867:
1794:
1774:
1731:
1665:Safety valve
1594:"Pickle-pot"
1488:Thimble tube
964:Electric fan
764:Coil-on-plug
690:Turbocharger
685:Supercharger
557:Main bearing
547:Firing order
537:Displacement
487:
483:Block heater
467:Engine block
455:Part of the
454:
402:. Retrieved
397:
388:
376:. Retrieved
372:
363:
355:
350:
314:
310:
307:
304:Hybrid heads
294:
290:
271:
267:
263:
254:
253:
238:
229:
219:
212:
205:
198:
186:
170:Please help
158:
134:steam engine
121:
119:
94:stroke ratio
91:
52:
39:
35:
29:
1751:Watt engine
1551:Oscillating
1507:Boiler feed
1352:Plate chain
1331:Tusi couple
1244:Walschaerts
1129:Atmospheric
988:Lubrication
952:Air cooling
769:Distributor
721:Fuel filter
699:Fuel system
680:Intercooler
647:Timing belt
637:Head gasket
567:Piston ring
1960:Ljungström
1946:High-speed
1839:Lap Engine
1795:Resolution
1699:Precursors
1584:Kirchweger
1546:Locomotive
1493:Three-drum
1473:Field-tube
1440:Locomotive
1422:Lancashire
1342:Link chain
1326:Crankshaft
1293:Mechanisms
1221:Valve gear
1040:Power band
1000:Oil filter
974:Thermostat
919:EGT sensor
881:MAF sensor
876:MAP sensor
861:Air filter
825:Alternator
784:Spark plug
716:Carburetor
642:Rocker arm
582:Valvetrain
513:Crankshaft
457:Automobile
343:References
326:Bore pitch
284:, and the
255:Bore pitch
202:newspapers
140:Bore pitch
1991:Cugnot's
1934:Salamanca
1635:Hydrolock
1620:Crosshead
1566:Condenser
1402:Egg-ended
774:Glow plug
736:Fuel tank
731:Fuel pump
498:Crankcase
274:Stovebolt
159:does not
120:The term
87:cylinders
69: (
42:) is the
2050:Category
1974:See also
1900:Compound
1775:Old Bess
1615:Blowback
1538:Cylinder
1524:Injector
1483:Stirling
1478:Sentinel
1392:Haystack
1306:Cataract
1279:Southern
1269:Caprotti
1144:Compound
1073:Category
1018:Dry sump
1014:Wet sump
1005:Oil pump
969:Radiator
886:Throttle
746:Ignition
617:Camshaft
542:Flywheel
523:Cylinder
508:Crankpin
319:See also
126:cylinder
48:cylinder
46:of each
44:diameter
1690:History
1599:Surface
1417:Cornish
1377:Boilers
1259:Corliss
1196:Corliss
1179:D slide
1149:Uniflow
1139:Cornish
1045:Redline
929:Muffler
830:Battery
754:Magneto
216:scholar
180:removed
165:sources
83:
71:
2002:(1784)
1996:(1769)
1962:(1908)
1956:(1862)
1937:(1812)
1929:(1805)
1919:Murray
1910:(1803)
1889:(1804)
1883:(1803)
1877:(1803)
1871:(1801)
1841:(1788)
1835:(1786)
1829:(1785)
1823:(1783)
1817:(1782)
1798:(1781)
1790:(1779)
1784:(1778)
1778:(1777)
1770:(1768)
1742:(1795)
1736:(1760)
1728:(1725)
1709:(1698)
1675:Stroke
1640:Piston
1625:Cutoff
1498:Yarrow
1450:Launch
1445:Scotch
1206:Sleeve
1201:Poppet
1186:Piston
1167:Valves
1159:Valves
1068:Portal
856:Airbox
835:Dynamo
562:Piston
552:Stroke
531:layout
459:series
404:7 July
378:7 July
280:, the
218:
211:
204:
197:
189:
102:torque
34:, the
1608:Other
1412:Flued
1397:Wagon
1321:Crank
1264:Lentz
1254:Baker
1249:Allan
1174:Slide
1028:Other
652:Valve
622:Chest
223:JSTOR
209:books
128:of a
100:) or
30:In a
1760:Beam
1301:Beam
1211:Bash
1191:Drop
1134:Watt
1010:Sump
527:bank
488:Bore
406:2019
380:2019
195:news
163:any
161:cite
122:bore
92:The
38:(or
36:bore
1579:Jet
1407:Box
1239:Joy
1229:Gab
995:Oil
584:and
469:and
174:by
132:or
108:or
98:rpm
2052::
1016:,
529:,
396:.
371:.
136:.
112:.
50:.
1107:e
1100:t
1093:v
1020:)
1012:(
533:)
525:(
438:e
431:t
424:v
408:.
382:.
245:)
239:(
234:)
230:(
220:·
213:·
206:·
199:·
182:.
168:.
80:2
77:/
74:1
67:π
20:)
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