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opening and closing. But since there is overlap between the intake and exhaust profiles there is a point in which both valves are open. At that point the inertia of the exhaust gases leaving the cylinder helps to aspirate the intake gases into the cylinder. The other main reason for the better
262:(though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of
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performance of crossflow is that the ports and valves can be larger and its physical separation of the hot exhaust manifold keeps the air in the intake manifold cooler. Most modern engines are of a crossflow design. The engineering terminology for these benefits is greater
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This term is used for engines which have two intake and two exhaust valves per cylinder; four (or five) valves per cylinder result in engines having superior high RPM performance sourced from total port circumference, rather than the relative location of the ports.
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Cross-section of a four-stroke engine showing the flow of gases across the cylinder head from the inlet port on the right to the exhaust port on the left, via the combustion chamber
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299:. The term was also briefly used in the early 1980s in Australia for the revised 4.1 litre inline six-cylinder engine in Ford's Australian large family car, the
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303:. This was in response to the post-1979 fuel crisis where the Falcon was a comparatively fuel-inefficient car compared to its contemporary rivals.
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engine, and its short-block "Valencia" derivative which has been used in cars from the 1960s up to the present day, albeit with the addition of
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ports on opposite sides. The gases can be thought to flow across the head. This is in contrast to
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Cutaway view of the overhead camshaft, rockers and valves of a crossflow cylinder head
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Crossflow heads use overhead valves, but these can be actuated either by
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In the UK, "Crossflow" is also used to refer specifically to
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220:Crossflow cylinder head, with twin overhead cams
43:but its sources remain unclear because it lacks
201:designs that have the ports on the same side.
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8:
118:introducing citations to additional sources
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379:
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74:Learn how and when to remove this message
459:Crankcase ventilation system (PCV valve)
108:Relevant discussion may be found on the
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7:
14:
237:
225:
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101:relies largely or entirely on a
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20:
561:Overhead valve (pushrod) layout
352:"What do cross-flow heads do?"
1:
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402:Internal combustion engine
260:Reverse-flow cylinder head
199:reverse-flow cylinder head
1019:
870:Diesel particulate filter
822:Idle air control actuator
763:Engine control unit (ECU)
408:
129:"Crossflow cylinder head"
935:Viscous fan (fan clutch)
847:Throttle position sensor
556:Overhead camshaft layout
315:Four-valve head, from a
297:engine management system
29:This article includes a
474:Core plug (freeze plug)
254:A crossflow head gives
183:crossflow cylinder head
58:more precise citations.
320:
314:
269:volumetric efficiency
715:Compression ignition
114:improve this article
865:Catalytic converter
356:high-tech-guide.com
991:Knocking / pinging
583:Combustion chamber
321:
281:Ford Motor Company
256:better performance
206:overhead camshafts
189:that features the
31:list of references
1050:Engine technology
1037:
1036:
1006:Stratified charge
773:Electrical system
755:Engine management
588:Compression ratio
528:Starter ring gear
427:rotating assembly
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880:Exhaust manifold
745:Spark plug wires
631:Boost controller
618:Forced induction
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307:Four valve heads
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568:Tappet / lifter
551:Flathead layout
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35:related reading
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682:Fuel injection
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358:. 18 June 2022
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336:, a crossflow
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317:Suzuki GSX1100
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293:fuel injection
289:overhead valve
287:four-cylinder
285:Kent Crossflow
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112:. Please help
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39:external links
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913:Water cooling
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890:Oxygen sensor
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805:Intake system
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796:Starter motor
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735:Ignition coil
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667:Petrol engine
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662:Diesel engine
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626:Blowoff valve
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543:Cylinder head
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434:Balance shaft
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334:T-head engine
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295:and a modern
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187:cylinder head
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131: –
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125:Find sources:
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103:single source
99:This article
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78:
75:
67:
57:
53:
47:
46:
40:
36:
32:
27:
18:
17:
920:Electric fan
720:Coil-on-plug
646:Turbocharger
641:Supercharger
513:Main bearing
503:Firing order
493:Displacement
439:Block heater
423:Engine block
411:Part of the
410:
360:. Retrieved
355:
322:
278:
253:
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182:
180:
167:
157:
150:
143:
136:
124:
100:
70:
61:
50:Please help
42:
944:Lubrication
908:Air cooling
725:Distributor
677:Fuel filter
655:Fuel system
636:Intercooler
603:Timing belt
593:Head gasket
523:Piston ring
56:introducing
996:Power band
956:Oil filter
930:Thermostat
875:EGT sensor
837:MAF sensor
832:MAP sensor
817:Air filter
781:Alternator
740:Spark plug
672:Carburetor
598:Rocker arm
538:Valvetrain
469:Crankshaft
413:Automobile
345:References
338:side-valve
250:Advantages
170:March 2024
140:newspapers
64:March 2024
730:Glow plug
692:Fuel tank
687:Fuel pump
454:Crankcase
110:talk page
1044:Category
1029:Category
974:Dry sump
970:Wet sump
961:Oil pump
925:Radiator
842:Throttle
702:Ignition
573:Camshaft
498:Flywheel
479:Cylinder
464:Crankpin
328:See also
275:Examples
1001:Redline
885:Muffler
786:Battery
710:Magneto
362:25 June
340:engine.
258:than a
195:exhaust
154:scholar
52:improve
1024:Portal
812:Airbox
791:Dynamo
518:Piston
508:Stroke
487:layout
415:series
301:Falcon
191:intake
156:
149:
142:
135:
127:
984:Other
608:Valve
578:Chest
264:valve
185:is a
161:JSTOR
147:books
37:, or
966:Sump
483:bank
444:Bore
364:2022
193:and
133:news
951:Oil
540:and
425:and
283:'s
116:by
1046::
972:,
485:,
354:.
271:.
181:A
41:,
33:,
976:)
968:(
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394:e
387:t
380:v
366:.
172:)
168:(
158:·
151:·
144:·
137:·
120:.
106:.
77:)
71:(
66:)
62:(
48:.
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