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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Running on methanol
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<blockquote data-quote="passenger0_0" data-source="post: 46362" data-attributes="member: 208"><p>To offer an alternative perspective. Although methanol motors can tolerate very high compression ratios without detonation occurring you don't need to raise the compression to get some of the benefits burning alcohol offers. For example - I've raced an 8 valve Indian with 5:1 compression running on alcohol which went very well. Additionally, don't get caught up in the hype of going over rich as alcohol needs an increase of 2.4 times in flow rate - any more and you're simply going to wash the bore and fill the oil tank with fuel by being over rich. The 1200 main jet size quoted is used for carburettors which have the jet block remote from the main airflow stream (such as Amal GP) so the jet experiences less pressure differential (vacuum). When using carbs with the needle set in the middle of the slide go for an increase of 2.4 times. Ogrilp400 is right though in that you want the jets to meter the flow - not the fuel supply system. I believe there is some good advice give in the book "The First 40 Years". Good luck - David.</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 46362, member: 208"] To offer an alternative perspective. Although methanol motors can tolerate very high compression ratios without detonation occurring you don't need to raise the compression to get some of the benefits burning alcohol offers. For example - I've raced an 8 valve Indian with 5:1 compression running on alcohol which went very well. Additionally, don't get caught up in the hype of going over rich as alcohol needs an increase of 2.4 times in flow rate - any more and you're simply going to wash the bore and fill the oil tank with fuel by being over rich. The 1200 main jet size quoted is used for carburettors which have the jet block remote from the main airflow stream (such as Amal GP) so the jet experiences less pressure differential (vacuum). When using carbs with the needle set in the middle of the slide go for an increase of 2.4 times. Ogrilp400 is right though in that you want the jets to meter the flow - not the fuel supply system. I believe there is some good advice give in the book "The First 40 Years". Good luck - David. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Running on methanol
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