As there were no takers for this engine, I went down to collect it last night and it's now back in Cambridge. I had a very interesting chat with Gilbert who is very keen for it to be kept in Jowett circles rather than scrapped and his wife fed me cake, so a pleasant evening out. With help from his son, we managed to man handle it into the back of the Volvo, but I had to dismantle it in the car so it was light enough for me to slide the engine down a scaffold plank. As a bonus, it's the annual Dad, Lads and Daughters camping trip this weekend, so I put all the wood back in the car so we can toast some marshmallows over it!
The modifications were at best Heath Robinson and I don't think it was ever that successful in the boat, overheating being a problem as there was no pump in the cooling system and the Ford Granada radiator probably not allowing for much thermosyphoning effect. Gilbert did think it had some sort of raw water cooling at some stage when the boat was built in the early 60s. He doesn't know what car the engine originated from.
Having dragged it out of the car, I was interested to see how the twin Zenith carbs had been fitted, but this has thrown up a bit of a mystery. Given the dubious state of the rest of the set up, I was expecting to see some sort of bodge with home made adapter plates and linkages. What I did find however was a very neat set up which looks like it come out of the factory. The adapter plates are cast aluminium with no sign of modification. The throttle linkages and the choke linkage bolted across the front of the timing case are nicely designed with no evidence of anything being home made. I'm sure I remember reading in the excellent Complete Jowett History that a few engines were fitted with twin carbs at some stage, though a quick look today, I couldn't find the right page. Could it be this is one of those engines, rather than a modification? Or possibly a hybrid/mongrel engine?
The engine number points to it being 1932 and it has a 3 speed gearbox. It also has a lucas "Electric Engine Starter" though I'm not sure if it's the right one as something rather serious has happened to the teeth on the flywheel!
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