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Post by Bruce on Oct 21, 2010 14:46:49 GMT -8
From Nov FasTrack
FV
1. (Multiple) FV Manifold Rules Change
The CRB has modified the published rule change for FV manifolds to average the measurements of the curved section and
has sent the proposal to the BoD for approval.
The CRB wishes to thank all the members who wrote regarding this proposed rule change. We received more letters on this
issue than we ever have on any other.
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Post by Bruce on Nov 24, 2010 14:21:28 GMT -8
Formula
Item 1. (July)
FV
In 9.1.1.C.20, make the changes shown below (20.c, d, and e are unchanged). [If this recommended rule change is approved,
the CRB expects there will be no future changes to the intake manifold rules.]
“20. US imported VW Type 1, 1200 sedan manifold must be used. The manifold heat riser tube and heat sink shall be
removed. Removal of metal from the interior of the intake manifold and the interior rust-proofed is permitted provided
that the following dimensions are not exceeded.
See Figures 1 and 2 at the end of this subsection for application of certain measurements specified herein.
a. Down Tube: The O.D. of the down tube shall be measured at two different locations within an area between 0.500”
and 2.00” above the horizontal manifold tube. Each measurement shall be taken four times rotating around the
circumference of the tube, and averaged.
The Aaveraged O.D. of the down tube dimensions shall not exceed 1.140 inches in O.D. Removing material from
the outside of the manifold to achieve the legal dimension is not permitted. Removal of the manifold down tube
from the horizontal tube is prohibited. The original factory furnace bronze attaching process and original factory
bronze repair material may be visible, inside and outside the manifold.
b. Horizontal tube: The O.D. of the horizontal tube shall be measured at four different locations on each side of the
down tube. The area to be measured on each side of the down tube is defined as being between the bend and a
point that is 1.500 inches from the center of the down tube connection. Each measurement will be taken four (4)
times, rotating around the circumference of the tube, and averaged. The Aaveraged O.D. of the horizontal tube
dimensions shall not exceed 0.994 inches O.D. In addition, the maximum O.D. of the manifold measured where
the tube inserts into the two head flanges, and just above any repair material that has been added, is 1.050 inches.
Removing material from the outside of the manifold to achieve the legal dimension is not permitted.
The tubes making up the manifold must also meet the following requirements:
1. The minimum bend-to-bend distance is 17.75 inches. The bend-to-bend distance is the distance between
points along the horizontal tube where the .994 inch OD, as described above, is first exceeded.
SCCA FasTrack News December 2010 Page 9
2. At no point in the bends of the horizontal tube may the average O.D. exceed 1.070 inches. Measurements
will be taken four (4) times rotating around the circumference of the tube and averaged.
3. The maximum carburetor flange height is 9.25 inches measured from the intake cylinder head sealing
surface to the centerline of the top of the carburetor flange.
4. The maximum deviation
from straight along the 17.75 inch bend-to bend section of the horizontal tube is 0.25 inches.”
It is now approved
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