Fishtank Splitter Vacuum
22nd February 2005
4 Y-joints were used to tap vacuum from under the 4 throttles. The vacuum were originally used for VSV for EVAP control. It was hoped to obtain vacuum from all 4 throttles so that the vacuum for fuel pressure regulator would be very stable.
However the project is a failure because the 4 vacuum comes from a very very small hole right under the butterfly. In fact when the butterfly is fully closed the 0.7 mm hole is covered 50% or more.
Since my butterfly was previously re-set by a local mechanic, it is unknown if the closure is still correct. Regardless 50% of the hole is exposed / breathing but it in front of the butterfly. Hence it is not a good place to obtain vacuum.
The holes picture: -
The other reason of failure is because the plastic Y-joint melted away after several days.
If vacuum are to be obtained from all 4 throttles then tapping from above is advised.
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