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
kevin lane wrote:
No, I decided to keep the runners straight and come in from underneath with
the injectors, since it would be less turns for the air to reach the rotor,
and less welding. I will get you a photo next week after it finally gets
welded. Bill's work is beautiful. I matched the original manifold's
diameters, so have 1 1/2" primaries and 1 3/8" secondaries(did I remember
this correctly?). Consequentially it is hard to make the two sizes look as
nice and uniform as what Bill has. But, it will work and most likely get
changed, so I plug on.
If I build a big throttle body from some 4" pipe, what type of bearings
will be needed for the axle, if any? The stock carb appears to have brass
bushings pressed in place. Is this really necessary for an airplane
application? Could I just weld some blocks of AL to each side and then
machine a hole for the axle? I realize that I need to address the sideways
movement, although the brass throttle plate inside should trap the axle,
right?
Kevin Lane Portland, OR
e-mail-> n3773@attbi.com
web-> http://home.attbi.com/~n3773
(browse w/ internet explorer)
Aluminum blocks should work. Right.
Paul Lamar
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