|QUB 250cc Road Race Motorcycle|
It was in June 1967 that Gordon Blair, M Johnston and their associates at Queens University Belfast conceived a new type of inlet valve for a two-stroke engine. A 250cc water cooled twin cylinder engine with this rotary sleeve valve was designed and built from scratch and first road tested in 1969.Back around the time that the blokes at Queen's College were putting this bike together, I was trying to resurrect a 250cc Suzuki Hustler, a two stroke machine that was supposed to be capable of 30 horsepower. Getting 42 horsepower from a 250cc engine would have been phenomenal.
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The engine was coupled to a 5 sped Albion gearbox via a Morse “Hy-Vo” chain and mounted in a frame made by Colin Seeley. The total weight of the machine was 265lbs.
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There was a very steep rise in power from the engine from 9,000 RPM and a sudden cut-off at 11,250 RPM. Peak power was found to be 45 BHP, but it was expected that with some development 10% more would be achieved.
I also found this excellent story by former chain man Ted Davis on the Vincent Owner's Club website.
I have more to say about the chain, but I wanted to get this up before I lost the links.