Non A*E* Roots Numbers

[Greg Hermann]

One of the more significant things to observe in the numbers posted here is
how LOW the VE for a Roots is at low engine/blower speed--these low VE
numbers at low speed translate to not much boost there until the revs are
up a bit!! A VATN turbo will actually get the boost up a LOT SOONER than a
Roots or a Screw huffer!! Get it up rates for VATN turbo/
Roots/conventional turbo are prolly sorta comparable to the same rates for
a 15 year old boy/ 30 year old man/50 year old man!

Another point to consider--Don't even THINK about running a Roots or a
screw in "blow thru" configuration!

>
>Then for the truly insane who covet Lancia technology, you can take a couple
>of whirly thingees and use them to pump into a roots.   Its a little known
>factiod that roots blowers efficiency in all matters goes up with increasing
>air density and with twin turbos densifying the air prior to the roots, the
>Lancia got insane power and torque at any point of power curve.

This technology is not original to Lancia--GMC has done plenty of it on the
2 cycle Jimmy diesels, as well-- and prolly long before Lancia ever tried
it. Look the 350 HP 8V-71 in those Detroit Diesel manuals, and observe the
"whirly thingies" feeding the Roots! This is only one example of many. A
4-53 T is a pretty common heavy equipment motor.
>
>And its not fair to compare an un-aftercooled roots to an extensively after
>cooled whirly thing.   Roots systems respond as well or better to after
>cooling.   Ps  you can't "inter" anything unless you have one before and one
>after the "inter" - but I forget that technical stuff has been dumbed down to
>comic book level to sell overpriced parts to the idiots and inter has more
>marketing sauve than the truth.

Agree completely as to the after vs. inter semantics, but somebody
somewhere has written down a definition saying that inter means
after--betcha hear about it!!

Greg