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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
276 Rapide carb jets
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<blockquote data-quote="blueshed" data-source="post: 14446" data-attributes="member: 1736"><p>What you have there is a potted history of Amal Standard Carburetter jet blocks! </p><p></p><p>Amal used a series of numbers indicating carburetter bore sizes. 45 indicated a 1" bore carburetter and may indicate the choke size of these jet blocks. The 30T is related to the pilot drilling which is most commonly equivalent to a 30cc pilot jet.</p><p></p><p>The jet blocks for pre-war Type 6 and Type 76 carburetters drew air through four drillings around the circumference of the mixing chamber . The jet block in the centre of the photos is one of these.</p><p></p><p>In 1939 the four holes were eliminated and and a flat was milled across the top of the jet block with two primary air passages drilled through it. The motivation was the need to ensure proper air filtering - particularly in the Western Desert! At that point the carburetters became Type 276.</p><p></p><p>This modification was quickly superseded by a further design where a primary air hole was drilled to align with the air intake passage in the carburetter air intake. That's the third one of the set.</p></blockquote><p></p>
[QUOTE="blueshed, post: 14446, member: 1736"] What you have there is a potted history of Amal Standard Carburetter jet blocks! Amal used a series of numbers indicating carburetter bore sizes. 45 indicated a 1" bore carburetter and may indicate the choke size of these jet blocks. The 30T is related to the pilot drilling which is most commonly equivalent to a 30cc pilot jet. The jet blocks for pre-war Type 6 and Type 76 carburetters drew air through four drillings around the circumference of the mixing chamber . The jet block in the centre of the photos is one of these. In 1939 the four holes were eliminated and and a flat was milled across the top of the jet block with two primary air passages drilled through it. The motivation was the need to ensure proper air filtering - particularly in the Western Desert! At that point the carburetters became Type 276. This modification was quickly superseded by a further design where a primary air hole was drilled to align with the air intake passage in the carburetter air intake. That's the third one of the set. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
276 Rapide carb jets
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