Interesting comments.............Since I don't have a belly pan, it gets a
little
more "vague". Last year I installed adjustable coil-overs which brought the
front end
down "a bunch" - too much rake according to some people. I will say that it sure
improved the high-speed handling. The front "dam" on my car is less than an
inch off
the deck at rest, but as it is rubber, folds under nicely (but not too much) at
speed. (500 lb springs on the front) I plan to bring the rear down more this
year,
and I guess like most things, it's just trial & error.
Ed
"Thomas E. Bryant" wrote:
> Ed,
> I don't know if there is a recognized method, but measuring the bottom
> line of the car would seem to be proper.
>
> It is my understanding that the rake has more to do with the air under
> the car than that on top. Under the car the air becomes turbulent and
> needs more room to exit than it did to enter. Of course, the wedge
> effect (as with my car) does give down force to the chassis, from air
> over the top, sometimes more than you may want. I have not measured the
> down force on my car, but I do know that the skirting at the nose of the
> car is badly worn from contact with the salt on the course. At rest it
> clears by at least 2 inches. Just some food for thought!
>
> Tom, Redding CA (90 degrees) - #216 D/GCC
>
> Ed Van Scoy wrote:
>
> > OK, I'll be the one to ask the stupid question...... What is the proper way
>to
> > measure rake?
> > Ed (we never did settle the question of measuring frontal area............)
> >
> > The Butters Family wrote:
> >
> >> my source of information on this is from an April1976 article in HOT ROD
>,
> >> good article, looks like 1 1/2 degrees is about what you are looking for
>which
> >> gives a reasonable reduction in front end lift and drag, more isn't better
>as
> >> drag increases even though you are reducing lift. kvach
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