Jerry Hey wrote:

For everyone's info,  after seeing the prototype throttle body, Rolf
has  suggested  moving the center of the 1.5" bore to 2.5"  above the
housing center.  This is to improve the IO and IC timing.  The new
numbers are I.O.:-76º BTDC and I.C.: +76 ABDC.  He has also suggested
increasing the butterfly size to 1.625 inches.  The shape of the port
can be modified with a die grinder to improve flow.  The shape we are
looking for is shown in a beautiful drawing which is attached.  The
important concerns are to leave the height of the port (top and bottom)
unchanged  and to taper the indicated changes back toward the butterfly
about an inch.  According to Rolf's calculations this throttle body
should be adequate for the RPM of either the 2.17 or 2.8 drives.  I
will make the changes in the prototype next week and report back.
Jerry

Jerry can you send a gif of that pdf drawing?

Paul Lamar

 
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