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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