One of the issues we spotted when trying to rebuild the engine was the carburettor linkage. The need for a solution to the original system was discussed in “suckers” posted earlier in the blog.
It was a tricky problem and one that needed a clever solution. The original installation had connected to the spindle of the carburettor nearest the bulkhead. The other side of this spindle had been used to drive the shaft under the manifold which operated the remaining two carbs.
If you look closely at the picture above, you can see the linkage to the first carb
There were two principle problems with this system.
- The first carb spindle carried the stresses of operating all three carbs. This had caused the spindle bush to wear.
- Due to the inevitable slack in the linkage the other two carbs would operate after the first, making balancing the carbs virtually impossible.
In essence we needed to find a way to use the under-manifold linkage to drive all three carbs. the solution was to engineer a new linkage to join the throttle movement to the existing linkage.
The bits of linkage were collected and some thinking followed…
Jerry’s solution was as follows:-
This seemed just the job and so it was this design that went into production.
Once installed on the engine it worked a treat.
Of course the real test would be how it worked when the engine was running. How the modulation transferred to pedal travel, for that only time would tell.
Here’s a final shot of the installed linkage from the underside on the engine once installed.
In this shot you can also see the installed individual carburettor return springs. These were mentioned in an earlier blog, but not shown on the car.
another job jobbed…..