Dave:
what you are describing is a good bypass filteration system, and not a full flow system
unless i am missing something.
on the chinese single's changfa/redstone they use a gearotor oil pump driven off the countershaft
(lower shaft on those with twin counters), the pump sucks oil up through the sump as normal
and admits this pressurized oil via a passage in the block.. to the mainbrg.. crank.. big end. etc.
if one were to remove the pump, press in a plug into the passage, then drill the pump for an external pressure
line, to feed a filter and a bypass (the bypass exhaust could then be routed through a bypass filter and then dump back
into the crankcase) , the now filtered and pressurized/regulated oil is then routed to the end of the case where the crankcase cover opens to expose the crank, rod assy,,
along the edge of the crankcase under the gskt inline with the oil pump there is another plug, remove it
and insert the filtered/regulated oil into there, that is the rifle drilled passage to the main brg that passes
right under the passage we plugged under the oil pump in the beginning
what you end up with now is a full flow filtration system that has all the oil that is pressurized and fed to brgs, bushings
etc fully filtered and regulated to whatever psi you want it to, and
you have all the bypass oil filtered as well in your bypass filter.
depending on the quality of filteration one could then be assured that all the oil being fed into the brgs is filtered to whatever micron
one thinks he wants.
with such a system there is no chance of an errant piece of swarf, sand, grit, bug, etc can foul a brg or scratch a crankjournal.
and before anyone goes ape about KISS and safety of external oil lines, i would not recommend steel lines because most folks
won't secure them properly, i would however suggest JIC hydaulic lines size #4 as being adequate and with a lifespan longer than
most of us want to wait for especially in standby/emergency use. even when they do fail it is not catastrophic, they just start to
weep and drip for a long time before they start to dribble and then much longer before they squirt
a #4 hydraulic hose is good for ~4000psi iirc, certainly far more than the need.
i probaby would not go to the trouble of fitting all this up on a standby engine, but for an engine that will be running long hours
and if i were to do a complete tear down?? you betcha,,, thats the time to make the necessary changes.
i like the idea of getting the oil pressure down to something reasonable, it allows an off the shelf oil pressure switch to monitor
the pressure and shut down the engine if the pressure falls dangerously low.
fwiw
bob g
