Air intake tumble

[Genie47]

See the following links for a good read:

 

http://www.kfztech.de/kfztechnik/motor/brennverfahren.htm

http://www.autozine.org/technical_school/engine/petrol1.htm

 

Generally more crucial to diesel engines and direct fuel injection engines since there is less time to mix fuel.

 

Honda VTEC uses staggered valve openings at partial throttle to achieve this. They only synchronize at full flow. Very ingenious and simple.

http://www.insightcentral.net/encyclopedia/envtece.html

 

VW FSI engines use a "tumble flap" to cause tumble motion at partial throttle.

 

 

Goes to show all the tornado and cyclone stuff are pretty much useless as snake oil for our current MPFI cars.