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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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<blockquote data-quote="Simon Dinsdale" data-source="post: 132846" data-attributes="member: 58"><p>If its blowing out the breather then the crankcases are getting pressurised from blowby past the pistons and rings. There is no shortcut to dealing with Vincent barrels and excessive oil consumption and you have to ensure the fit between muff and liner is correct before anything else and simply boring a barrel to say +20 piston will not work.</p><p>A Vincent with modern pistons, rings and properly sorted barrels should do at least 2000 miles per pint. I used to change the oil in my Rapide every 2000 miles and inbetween it didn't need topping up at all. Over the last couple of years that slowly got worst and started to blow oil out of the breather, but didn't appear to be burning oil. So last year during to lockdown I pulled the top end and found the front cylinder liner had lost its interference fit so it was time to do a top end overhall as the pistons and liners had been in for over 50,000 miles. New pistons, new liners in the muffs which was bored to 6 thou interference fit to the new oversized liners, and its back to a clean breather pipe but I have not managed to do many miles to fully bed the rings in due to covid restrictions and winter.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 132846, member: 58"] If its blowing out the breather then the crankcases are getting pressurised from blowby past the pistons and rings. There is no shortcut to dealing with Vincent barrels and excessive oil consumption and you have to ensure the fit between muff and liner is correct before anything else and simply boring a barrel to say +20 piston will not work. A Vincent with modern pistons, rings and properly sorted barrels should do at least 2000 miles per pint. I used to change the oil in my Rapide every 2000 miles and inbetween it didn't need topping up at all. Over the last couple of years that slowly got worst and started to blow oil out of the breather, but didn't appear to be burning oil. So last year during to lockdown I pulled the top end and found the front cylinder liner had lost its interference fit so it was time to do a top end overhall as the pistons and liners had been in for over 50,000 miles. New pistons, new liners in the muffs which was bored to 6 thou interference fit to the new oversized liners, and its back to a clean breather pipe but I have not managed to do many miles to fully bed the rings in due to covid restrictions and winter. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Oil consumption
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