This article appears in OBM this month featuring a Villiers V twin based on the 2T engine. It had previously been mentioned in OBM as a 'Greeves 4' which of course its not
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Not Greeves but......
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It must have two cylinders firing together, fed by a common crankcase. In other words both right hand cylinders fire, followed, 180 degrees later, by both left hand cylinders.
I saw a flat-twin two-stroke once that operated in the same way - it must have had a crankshaft with two crankpins, because both cylinders fired at once. Or so the owner assured me...Colin Sparrow
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Yes........but did he realise that before he fitted the charger, or was that a OOps need more primary compression moment?
Colin the big-ends are on 2 common crankpins, so, for example, the 2 right cylinders fire at 90 degrees to each other. They share a common primary compression, which while some would be present, would be woefully lacking to feed both pots.
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Originally posted by Brian Catt View PostYes........but did he realise that before he fitted the charger, or was that a OOps need more primary compression moment?
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Originally posted by Brian Catt View PostYes........but did he realise that before he fitted the charger, or was that a OOps need more primary compression moment?
Colin the big-ends are on 2 common crankpins, so, for example, the 2 right cylinders fire at 90 degrees to each other. They share a common primary compression, which while some would be present, would be woefully lacking to feed both pots.Colin Sparrow
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