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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Amal Premier 900 series Carb for Comets
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<blockquote data-quote="Martyn Goodwin" data-source="post: 47884" data-attributes="member: 2433"><p>After extensive road trials conducted over a number of weeks the following is the current suggested configuration for a Amal Mk1 Premier 930 carb fitted to a Vincent Comet. Also I have had the failed (melted) piston examined by an expert aeronautical engineer who specialises in combustion chamber physics. It was his VERY STRONG opinion that it was NOT a lean mix that caused the failure, but rather detonation. He recommended using the highest octane fuel available and also reducing the ignition advance to NO MORE then 32 degrees BTDC. So here is the conservative tuning configuration</p><p></p><p>#3 Slide,</p><p>Norton Commando style spray tube</p><p>Main Jet 240, </p><p>Needle Jet 105, </p><p>needle in centre groove,</p><p>RJ19 pilot jet</p><p>idle mixture screw 1 1/4 turns out. </p><p></p><p>Timing set to <u>no more</u> than 32 degrees BTDC at full advance</p><p></p><p>my original post (#7 in this thread) has been updated as well.</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 47884, member: 2433"] After extensive road trials conducted over a number of weeks the following is the current suggested configuration for a Amal Mk1 Premier 930 carb fitted to a Vincent Comet. Also I have had the failed (melted) piston examined by an expert aeronautical engineer who specialises in combustion chamber physics. It was his VERY STRONG opinion that it was NOT a lean mix that caused the failure, but rather detonation. He recommended using the highest octane fuel available and also reducing the ignition advance to NO MORE then 32 degrees BTDC. So here is the conservative tuning configuration #3 Slide, Norton Commando style spray tube Main Jet 240, Needle Jet 105, needle in centre groove, RJ19 pilot jet idle mixture screw 1 1/4 turns out. Timing set to [U]no more[/U] than 32 degrees BTDC at full advance my original post (#7 in this thread) has been updated as well. Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Amal Premier 900 series Carb for Comets
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