puff4
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Alpines supplied with twin Zenith-Stromberg CD150 carburettors have four plastic pieces on the throttle shaft linkage (Rootes PN 5044280) that provide a type of 'universal joint' functionality that prevents that shaft from binding when the carburettors are slightly misaligned (which they usually are). These parts become brittle over time and fracture where the locating pins are inserted, often making them sloppy or even non-functional. The items in discussion are circled here on a factory parts manual page:
Mike Hartman and I have been discussing the way forward in terms of replacement, given these are no longer available. He asked if I might be able to reverse-engineer some replacements, and I promised to do my best. What is shown below is my 'first cut'.
I will be 3D printing some this coming weekend when I've returned home. This print will allow me to confirm that the measurements are spot-on as-re the originals, but I suspect I'm pretty close with what I have so far.
Once I've confirmed the design, I'll be happy to supply either DWG or STL files to those who wish to make some for themselves. Mike has suggested he may try to get a pair made via CNC in metal to see how they look, but of course they may also be 3D printed in Nylon to be very nearly identical to the originals.
Here is the preliminary result of my reverse-engineered design:
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Mike Hartman and I have been discussing the way forward in terms of replacement, given these are no longer available. He asked if I might be able to reverse-engineer some replacements, and I promised to do my best. What is shown below is my 'first cut'.
I will be 3D printing some this coming weekend when I've returned home. This print will allow me to confirm that the measurements are spot-on as-re the originals, but I suspect I'm pretty close with what I have so far.
Once I've confirmed the design, I'll be happy to supply either DWG or STL files to those who wish to make some for themselves. Mike has suggested he may try to get a pair made via CNC in metal to see how they look, but of course they may also be 3D printed in Nylon to be very nearly identical to the originals.
Here is the preliminary result of my reverse-engineered design:
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