This page contains useful critical examination of the claims for intake-mounted "turbulators", written by an automotive engineer:
Fuel saving gadgets - a professional engineer's view
The key point:
Quote:
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Can a "bolt-on" device really increase the turbulence in the cylinder? The simple answer is no - the flow in the intake system is already highly turbulent at part load, with air speed past the throttle in the region of 200-300 metres/second. A device upstream of the throttle may make the air swirl there, but the swirl pattern will be destroyed as the flow squeezes past the throttle blade.
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