kevin lane wrote:

I am curious, when I look at other's installations it appears there is

much

more room above the engine block than in my RV-8 w/20B, which is

basically

12" above crank centerline at the firewall to 8" at the front of the

block.

What is the Mustang II clearances?
    I am having to install my primary injectors on the underside of the
intake runners for instance.  I am finally getting to the throttle body.
Turrentine told me  a 5.0L would work fine (2 3/8" dia) which is a long

ways

from a 4" (2.7 times the cap) which I heard recommended on this list.  I

did

notice that the throttle axle piece that holds the two 2" brass plates

from

the stock carb could also hold a single 4" plate easily, so fabricating

a 4"

might not be too difficult.  I might even attempt to saw off the

bearings

and weld them to a piece of 4" pipe if I decide I need the humongous
throttle.
    It's exciting to see your progress.  I hope to later turbo my engine

and

will be much interested in learning from your installation.
Kevin Lane  Portland, OR
e-mail-> n3773@attbi.com
web-> http://home.attbi.com/~n3773

Keven a 2-3/8 throttle body is too small. There will be a loss of manifold
pressure. It is nearly impossible to make one too big.

Are you using a step down in the intake manifold for the injectors
such as in this picture? This almost fits under the cowl of a Bill

Schertz's

Kis Cruiser so it should fit an RV8 no problem.

Paul Lamar

Keven,
    Here is my start on a throttle body using the secondaries butterfly
shaft from an old 13B throttle body and a 4" dia aluminum tube.  Just need
to add a base plate and a couple of shaft stops/idle adjustment and its
done.  So it is certainly feasible.  However, I have heard reports that
large plage throttle bodies not infrequently have a problem with sticking
butterfly plates when they are under manifold vacuuum.  We'll find out. The
smaller throttle body inthe first photo is a 5.0 1996 stock 70 mm throttle
body - looks small beside the 4" tube.

Ed Anderson

Butterflies don't stick as the pressure is balanced about the shaft.
Slide throttle stick unless ball bearings are used.

Paul Lamar
 
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