More questions regarding the Alpino design - this time oil supply to the cam box and to the Cam buckets. I notice the oil to the cam box is pumped up the 4 outer stud clearances and the oil exits to the outsides via a small hole in each stud hole in the cam box. I note that each of the small holes are different diameters - the largest of them being to the exhaust area which is the furthest from the oil pump supply .it appears that this is the cam bucket that often seizes ( as mine has) which results in a stuck valve and then unwelcome contact with the piston.... . it would seem more logical to have the small drillings also on the inner sides of the stud holes to allow oil to flow to the buckets easier especially for the furthest one from the pump. Has anyone modified the oil passages to improve oil flow to the buckets.
Another thing I noted compared to other engine designs is that the buckets themselves are very long at approx 26mm compared to other engines which have the buckets only between 16mm/20mm long. for example on the Triumph speed 4 ( which is - granted a more modern design) the 25mm diameter buckets are 16mm long which appears to be adequate for a much more powerful bike that has a higher rev ceiling.
I also note that some engine designs have grooves in the cam buckets, presumably to provide oil retention in the bucket bores.
Has anyone modified the oil supply to improve it or modified the buckets.
Stu
Another thing I noted compared to other engine designs is that the buckets themselves are very long at approx 26mm compared to other engines which have the buckets only between 16mm/20mm long. for example on the Triumph speed 4 ( which is - granted a more modern design) the 25mm diameter buckets are 16mm long which appears to be adequate for a much more powerful bike that has a higher rev ceiling.
I also note that some engine designs have grooves in the cam buckets, presumably to provide oil retention in the bucket bores.
Has anyone modified the oil supply to improve it or modified the buckets.
Stu
