waste gate purpose?

[David Wesner]

So, some engines have them, some don’t. I understand the principle, but am unclear “why”.

My best….thoughts are that the air stream velocity could float the valves???

D

Topic

[Tony Athens]

To allow more boost at lower engine output, gives a much fastest torque rise (like in the 1200-1800 RPM range ) when accelerating trying to get up on plane ( that also lowers dark smoke big time) but limit the boost at high power output/WOT where the waste gate can open to limit boost and limit compressor turbine RPM.. The linkage movement is very small and not easily seen.

[Author]

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