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A Special Builder's Notes

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The Special Builder's Breakfast Club

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03 January 2015

Where Did That Go...

...2014? Well, it's gone and now it's 2015 so, Happy New Year and thank you everyone for your continued indulgence.

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This year's New Year's Day meet was a bit dull and damp and, following the cold snap and the liberal application of salt to the roads, I didn't expect to see too much in the car park but, a full house caused plenty of congestion through the village of Hawkedon. My 'this month's most desirable motor' was a Mercedes Cabriolet. On the way to the fun, I pulled over to let a car pass and the Hillman's engine faded and died. It was a full five minutes before we got going again and it served to highlight the fact that I'd done nothing to try to eliminate this problem over the last few months.

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When I rebuilt the Bayliss Thomas's Meadows engine, I managed to get a new and correct carb for it but, for reasons I can't now recall, I had to make up a spacing flange - possibly to retain the original control positions. This also served as a heat sink and helped prevent the carb body from getting too hot. I first made the extension out of wood, experimented with various lengths of choke for a couple of hundred miles and finally made the successful version in aluminium. In fact, I would have happily continued with the beech prototype but a backfire in the manifold blew a hole in it.

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I think that I'm going to have to do the same for the Hillman although it could be a bit trickier in that the air cleaner elbow comes quite close to the bonnet side, allowing me only a small amount of play between the manifold and the carb. Some exhaust wrap - another thing I've mentioned before but failed to do anything about - will also help to absorb some of the heat under the bonnet which I think is at the root of all this (though I've never heard it said that the Morris MS saloon suffered in the same way).

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As a by-the-by; in an attempt to get the Meadows 4EB engine to run more smoothly, my next experiment was to hook up a modern distributor to the mag.

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It didn't make the slightest difference so I took the camshaft out and popped down to see Barrie Price of Lea Francis cars. There we compared my camshaft with a new one - you couldn't tell them apart. Eventually, Very Learned Counsel found that one or two of the new valve guides had been inserted in the head a swire out of square, thus stopping the associated valves from closing properly. Put right, the engine ran perfectly.

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But, more importantly, I've got down to the business of making the alterations to the Merlin axle on the racing car and, in paying a bit more attention to the detail, I can see that I can leave the inner portion of the old spring clamp brackets in place which will be a big help in securing the radius arms that stop the axle winding up under load. There'll still be a bit of fabrication in making what's left of the brackets secure, but it's going to make life a lot easier utilising what's already there rather than starting from scratch.

If not exactly a resolution, it's a plan.

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next post Another Week Goes By.

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