Swumble port
With a new port divider - the SWUMBLE port - BASTRA Engineering has developed a multi purpose high Tumble port applicable on two and four valve engines.
The special shape of this port divider allows to increase Tumble ratio of intake flows in comparison to conventional Tumble port applications.
A benchmark with conventional Tumble port concepts evidences the advantages of this concept using a Normalised Tumble Ratio (NTR):
|
conventional intake port: |
NTR = 10 rad/g |
|
intake port with Tumble-flap: |
NTR = 29 rad/g |
|
intake port with VW "FSI" concept: |
NTR = 36 rad/g |
|
SWUMBLE intake port: |
NTR = 39 rad/g |
The SWUMBLE port is able to be applied on Direct Injection systems for high tumble generation in part-load conditions.
In addition the SWUMBLE port is used as a self-controlled port divider (simply controlled by air/gas flow due to throttle position) on two and four valve carburettor/injection engines for improved fuel consumption efficiency (up to 10%).
Swumble-port
