I've got webers, the cannon manifolds, headers and a working
linkage. I'll take the air horns off and the heat shields off and
send you some digital pics after it cools down a bit outside (it's
close to 100 now and the garage A/C can't possibly deal with
that). In my case, the lower bell crank is on the front manifold -
are the front and rear manifolds the same (except for the boss)? Of
course, your header may be different than mine.
My linkage is a rod from the stock gas pedal bellcrank to the
bellcrank below the front carb. Another link from bottom bell crank
to upper linkage which attaches to both carbs - basically a rod with
three bellcrank arms coming off - one for each carb, one for the link
from the lower bell crank.
I much prefer a linkage to a one-way cable 'cuz if something happens
to make the carbs stick open I can get a foot under the gas pedal and
pull it up (maybe). A dual cable system like on my motorcycle would
allow this too. A good push / pull cable would do that as well, but
I'm not sure if those are available for throttle applications.
- Tony Drews
At 01:33 PM 7/30/2006, J.C. Hassall wrote:
>Amici,
>My TR4 has tubular headers which interfere with the linkage I
>planned for the dual Webers with Canon manifolds. The manifolds
>have a boss on top to support a shaft and linkage to drive the
>butterflies; the rear manifold has a boss underneath to support a
>bellcrank. The setup is similar to the Moss setup at
><http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29794&SortOrder=1>
>I planned to use a bellcrank under the carbs to translate horizontal
>accelerator arm motion to vertical to pull on an arm on the shaft
>mounted above the carbs. Problem is, one tube of the headers
>interferes with the bellcrank, so I only have about 1/4"
>travel. Fine if I don't want speeding tickets, but no fun to drive.
>
>Plan B is to fabricate a cable, perhaps from bicycle cable parts,
>but I'll have to fabricate a support tube to ensure that the cable
>pulls straight down. And of course add a return spring for safety.
>
>Plan C is to fabricate a spacer to stand off the the bellcrank from
>the manifold mounting boss by about 1.2", which should clear the
>manifold, and rely on the heim joints to accommodate all the angular
>mismatches.
>
>Anyone have suggestions for a better installation?
>
>TIA
>
>Jim
>--
>Jim Hassall
>Blacksburg VA
>jhassall@blacksburg.net
>'63 TR4 in autox preparation - 90% finished, 90% to go
>
>
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