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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
B cylinder oil hole vs C cylinder oil hole
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<blockquote data-quote="Oldhaven" data-source="post: 54124" data-attributes="member: 2879"><p>As Timetraveler mentions in his "not to worry" above, my B Rapide rebuild will have the cylinder oil feed blocked off and will not use the cylinder oil holes at all, though they are there and could be used if necessary. This was recommended by the long time racer/mechanic doing the rebuild. (He knows how to get the piston clearances right.) This is engine 1154 and uses two piece cylinder bolts. The outers are not waisted like the later one piece bolts and there is a less sealable arrangement between inner and outer bolts than the cylinder oil feed gallery groove in the crankcase thread of the one piece bolts. He was worried about oil creep up the two piece bolts causing a leak. I am sure this has been covered thoroughly in MPH somewhere in the past, but have not found the right search words to verify this. I am not sure if any difference in the hole position and slot shape shown above has to do with this difference in types of cylinder/head bolts for earlier B's, as I can't see that that matters. I note that Richardson mentions that the holes were moved lower in 1951 to come in below the rings.</p><p></p><p>Ron</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 54124, member: 2879"] As Timetraveler mentions in his "not to worry" above, my B Rapide rebuild will have the cylinder oil feed blocked off and will not use the cylinder oil holes at all, though they are there and could be used if necessary. This was recommended by the long time racer/mechanic doing the rebuild. (He knows how to get the piston clearances right.) This is engine 1154 and uses two piece cylinder bolts. The outers are not waisted like the later one piece bolts and there is a less sealable arrangement between inner and outer bolts than the cylinder oil feed gallery groove in the crankcase thread of the one piece bolts. He was worried about oil creep up the two piece bolts causing a leak. I am sure this has been covered thoroughly in MPH somewhere in the past, but have not found the right search words to verify this. I am not sure if any difference in the hole position and slot shape shown above has to do with this difference in types of cylinder/head bolts for earlier B's, as I can't see that that matters. I note that Richardson mentions that the holes were moved lower in 1951 to come in below the rings. Ron [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
B cylinder oil hole vs C cylinder oil hole
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