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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How critical are the rear cylinder oil feeds!
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<blockquote data-quote="Oldhaven" data-source="post: 102824" data-attributes="member: 2879"><p>My Rapide has undrilled/blank restrictor disks in the cylinder feeds. It is a '48 with 2 piece cylinder studs so oil taking the usual route to the liner hole is injected into an area where the ET158's in early machines are seated. The installation/removal castellations in them below the outers can allow oil to get into the space between the inner and outer stud and travel up the stud to the top of the head. Not a problem with later one piece studs fitted with sealant. This means more oil to the cams I guess.</p><p></p><p>I had not known that it was an option to not use the .170 jet in the jet holder, or to use a bigger one, and I remember some discussion years ago about how that might decrease the oil going to the big end, and maybe the top end and rockers. I imagine for a twin that might be the case, but for a single with half the bleed off and demand it might make some sense. I'd like to hear more on this.</p><p></p><p>My big bore Comet project will also have a blank disk in the cylinder feed and no liner drilling, partly due to the bad location of the incoming gallery, (which, as Greg mentions, can be remedied), but mostly because I can't see sending oil off into unused areas for no reason.</p></blockquote><p></p>
[QUOTE="Oldhaven, post: 102824, member: 2879"] My Rapide has undrilled/blank restrictor disks in the cylinder feeds. It is a '48 with 2 piece cylinder studs so oil taking the usual route to the liner hole is injected into an area where the ET158's in early machines are seated. The installation/removal castellations in them below the outers can allow oil to get into the space between the inner and outer stud and travel up the stud to the top of the head. Not a problem with later one piece studs fitted with sealant. This means more oil to the cams I guess. I had not known that it was an option to not use the .170 jet in the jet holder, or to use a bigger one, and I remember some discussion years ago about how that might decrease the oil going to the big end, and maybe the top end and rockers. I imagine for a twin that might be the case, but for a single with half the bleed off and demand it might make some sense. I'd like to hear more on this. My big bore Comet project will also have a blank disk in the cylinder feed and no liner drilling, partly due to the bad location of the incoming gallery, (which, as Greg mentions, can be remedied), but mostly because I can't see sending oil off into unused areas for no reason. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How critical are the rear cylinder oil feeds!
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