The design problem being overcome with the variable inlet lengths is making

the power band broad enough so that a six speed transmission can get the car

>from zero to about 170-190 MPH or higher

Lynn,  The variable lengths are so the engine will make useable mid-range 
power, yes. The speeds are much higher though, if you
don't do at least 220 on the mulsane you won't be in the hunt at Le Mans. 
The big Fords and 917-930 Porsche were doing better
than 230 in the pre-chicane days. 5 miles is a LOOOONG straight.
Bill Jepson

 
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