Postby DewCatTea-Bob » Fri Sep 21, 2012 1:14 am
By: Eldert...
"the placing of the oilinghole matters to . dont drill a oilinghole at the 12o clock position . the hole will be clogged in no time
due to the centrifugal forces flinging the sludge to the outside ( upperside ) of the pin . "
____ Now I wouldn't be surprised to get info like that from an "expert" in the field,
as I-myself wouldn't have had any expectations of a 2mm oil-hole ever getting plugged-up (under normally expected conditions), even on the centrifugally-forced side !
So that seems to me to be expert-advice.
" if i would have some pins made i would drill 2 oilingholes at 10 and 2o clock "
____ I still like the idea of three holes, and to make it sensibly MY-own idea, I'd suggest two 1.5mm holes (at 9:30 & 2:30 o'clock) with the third-hole being 2mm wide and located at 6-o'clock. - (Due to Eldert's point about the effect of centrifugal-force on the oil, I've now changed my thinking about the three holes being "equally spaced".)
The pair of 1.5mm holes are to be kept smaller so that the 2mm-hole (at 6-o'clock) gets a better chance to be of worthwhile use (as it would have centrifugal-force trying to starve it). _ I believe that the oil-hole located at 6-o'clock is possibly quite important to have, in the event that the other holes possibly become stuffed with sludge,, and this location is the least likely to ever become plugged-up (as centrifugal-force would draw-away any stuff that might plug it.)
The single 2mm & two 1.5mm oil-holes all combined, could provide a 6.25% increase in oil-flow capability (over a pair of 2mm-wide oil-holes).
__ I've put some good-thought into this, but still, I'd run it by a true-expert just to make sure that there's no cons which may go-along with all the pros I've considered.
" Bob mentions getting the heath out . this could be done by giving the rod enough side clearance so the oil can get out easy and get replaced by fresh oil . "
____ I don't know that that exrea-space measure would be necessary, (unless perhaps a larger oil-pump is employed), cuz I'd expect that the C-cuts on the sides of the rod's big-end should allow sufficient oil-flow, fairly well enough.
__ One thing that's of most importance though, is to keep the rod-bearings as cool as possible ! _ And I don't know of any other way to do that other than to make sure that a dense -(heavy weight) oil is kept flowing-past (by at-LEAST some minimum rate).
____ I hope & expect Eldert (or anyone else) to counter anything I've stated which is thought to possibly be incorrect thinking on my part here, (and hopefully actually agrees with most everything I've suggested & claimed here-above).
Dukaddy-DUKEs,
DCT-Bob
PLEASE NOTE... If this-post is not-yet signed-off with '-Bob', then I'm still in the process of completing it,, and if not also included with 'DCT' near bottom as well, then I may edit this post's wording at a later time. - Dct.Bob