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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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<blockquote data-quote="Martyn Goodwin" data-source="post: 85361" data-attributes="member: 2433"><p>I have hesitated to chime in here as I was not sure that my memory was clear. I have now checked my archives and dug out the following.</p><p></p><p>MPH #182 - In it a letter Phil Irving wrote to Harpers is quoted as follows: "cam wear is traceable in very many cases to people using too heavy a grade of oil. SAE 30 is too heavy where the engine is used for short runs and is not warmed up before working hard".</p><p></p><p>In MPH 233 Phil states " If you only do short runs you only need a couple of pints in the (oil) tank and thin oil at that!" He also tells that over-revving when cold with thick oil will quickly destroy a engine.</p><p></p><p>Then in MPH #392 Phil offered the following advise "Do NOT use multigrade oil in your Vincent if you would like the cams to last a reasonable mileage</p><p></p><p>So Greg it seems you are on the right track. Looks like a mono grade SAE 30 may be a good starting point; or a multi grade with 30 or 40 being the upper (thicker) end of its range. Penrite, Shell, BP, Valvoline and I am sure many others offer such oils. I reckon no matter what you choose, as long as its not too thick, it has to be better than what was available 70 years ago!</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 85361, member: 2433"] I have hesitated to chime in here as I was not sure that my memory was clear. I have now checked my archives and dug out the following. MPH #182 - In it a letter Phil Irving wrote to Harpers is quoted as follows: "cam wear is traceable in very many cases to people using too heavy a grade of oil. SAE 30 is too heavy where the engine is used for short runs and is not warmed up before working hard". In MPH 233 Phil states " If you only do short runs you only need a couple of pints in the (oil) tank and thin oil at that!" He also tells that over-revving when cold with thick oil will quickly destroy a engine. Then in MPH #392 Phil offered the following advise "Do NOT use multigrade oil in your Vincent if you would like the cams to last a reasonable mileage So Greg it seems you are on the right track. Looks like a mono grade SAE 30 may be a good starting point; or a multi grade with 30 or 40 being the upper (thicker) end of its range. Penrite, Shell, BP, Valvoline and I am sure many others offer such oils. I reckon no matter what you choose, as long as its not too thick, it has to be better than what was available 70 years ago! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil Viscosity
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