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A Special Builder's Notes

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The Special Builder's Breakfast Club

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27 January 2024

What A Good Idea...

... I can't wait for my next stroke of genius.

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When waking in the early hours, generally, my thoughts turn to the various projects currently on the go. That thinking time is always the most productive, even if its conclusions might throw up flaws in my plans. Such was the case with the 1911 Buick starter motor. My vision of a belt running around the perimeter of the flywheel was shattered when I realised that I would have to take the drivetrain apart - practically dismantling the whole car in the process - to install the belt. I needed a Plan B - one that ditched the belt drive. The Dynastart has a clockwise rotation, so by turning it to face backwards, the provision of a rubber wheel on the shaft of the Dynastart that would contact the flywheel (à la Darracq, Humber, and others) was a possibility - until I found that a. there were no obvious attachment points except some aluminium lugs on the sump whose use would be to court disaster, and b. the reverse configuration wouldn't accommodate a 6" diameter wheel. Fortunately, as the Dynastart has never been fitted and is unmarked, the supplier will swap it for an anti-clockwise rotation model, and I can proceed with the installation as planned. I'll still use the multi-V pulley but wrap its circumference with a replaceable section of the belt, so it acts as the rubber wheel. The extra surface area provided by the V's will reduce any tendency to slip on the aluminium. The outer surface of the flywheel will need a good clean and perhaps treating with some aircraft walkway paint for extra grip - we'll see.

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The Great Collector's latest addition to the fleet - a 1929 AC Acedes. It's very original and has an almost complete recorded history from day one. I'm looking forward to having a go in it, but its first stop is on the ramp for a thorough inspection and familiarisation with its systems.

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Whilst the AC was being collected, I stayed behind to deal with the Bean's carburettor. Our attempts to get the car going were only partly successful, it running for only a few seconds at a time. The carb (we'd eliminated any magneto problems with an almost full rebuild) maybe a Smiths type, at least that's what it says on the float chamber lid, but that might not be original. Made of bronze, despite evidence of external corrosion caused by modern fuels, it came apart relatively easily.

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The main jet consists of a through tube around which is arranged some sort of diffuser, perhaps a slow running device.

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Most of the assembly was almost wholly blocked with green oxide, as was the main-jet holder that also holds the float chamber to the body of the carb.

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A removable jet, screwed into the top of the holder fared little better. With it all cleaned up and back on the car, the Bean burst into life straightaway and ran perfectly. For The Great Collector's cars, turning off the fuel and letting the float chamber run dry before switching off, is probably an idea worth adopting.

previous post Keyways.
next post Promises, Promises.

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