i think this spec, from ASTM began 1987, 1 year before the first Sidekick
https://www.document-center.com/standard...%20EDITION
this also begs (oil is complex no?)
how many miles can i drive, and not fail the 4683.
may be 7k? who knows?
you drive same as my wife does, and we do same thing, low mileage drivers.
"according to mr.Bob, flow is that matters;"
only for the cooling effect and the swirl effect (secondary this is) over having full journal pressures.
5psi will do it a idle but no 5000 rpm.
read here under clearance. short an sweet.
http://www.aa1car.com/library/ar797.htm
the oil pressure at the bearing, must be enough to prevent metal contact,
if say the magic swirl effect (it is real the bearings are not round. and are wide at the oil port)
if the swirl effect was so good and only flow matters, then the engine could run for 20 years, at 1psi and huge flows.
and It will not.
ask any real engine builder that,?
and he forgets, if the mains and rods cant run spec, pressure
that means that cam way way up high and beyond, that 0.050"orifice plug, is a hopeless case.
and it takes pressure to flow.
just like in electroncs, takes voltage to flow, I= E/R.
if e =0 , no flow. I.
in fact the clearance acts as a R factor resistance, so if R is too high, then I (current) flow ,drops.
what usually happens is all 8 bearing wear out. ( Some are 27 years old now.... or are just huge mileage )
and flow is extreme, and pressures dope due to the PUMP can not keep up.
the oil light comes on at 3-5psi (normal is 20 min) and the bearings hit driving 85mph, and engine blows.
at this moment best is the 4683 oil, and fresh.
now lets talk the head screw in orifice,
it's there imo , to keep the mains and rods bearings from failing, when say the cam ,bearings fail, (catastrophic fail or cam breaks in half)
saving the block.
but is a flow restricter. to the head.
if the cam is well worn, (mains in cam , at limit)
and the crank gallery pressure drops too low. the cam will starve, and seize (fail hard.
and this video, does better
3:45 here
https://www.youtube.com/watch?v=eFe43SnBlMI
https://www.document-center.com/standard...%20EDITION
this also begs (oil is complex no?)
how many miles can i drive, and not fail the 4683.
may be 7k? who knows?
you drive same as my wife does, and we do same thing, low mileage drivers.
"according to mr.Bob, flow is that matters;"
only for the cooling effect and the swirl effect (secondary this is) over having full journal pressures.
5psi will do it a idle but no 5000 rpm.
read here under clearance. short an sweet.
http://www.aa1car.com/library/ar797.htm
the oil pressure at the bearing, must be enough to prevent metal contact,
if say the magic swirl effect (it is real the bearings are not round. and are wide at the oil port)
if the swirl effect was so good and only flow matters, then the engine could run for 20 years, at 1psi and huge flows.
and It will not.
ask any real engine builder that,?
and he forgets, if the mains and rods cant run spec, pressure
that means that cam way way up high and beyond, that 0.050"orifice plug, is a hopeless case.
and it takes pressure to flow.
just like in electroncs, takes voltage to flow, I= E/R.
if e =0 , no flow. I.
in fact the clearance acts as a R factor resistance, so if R is too high, then I (current) flow ,drops.
what usually happens is all 8 bearing wear out. ( Some are 27 years old now.... or are just huge mileage )
and flow is extreme, and pressures dope due to the PUMP can not keep up.
the oil light comes on at 3-5psi (normal is 20 min) and the bearings hit driving 85mph, and engine blows.
at this moment best is the 4683 oil, and fresh.
now lets talk the head screw in orifice,
it's there imo , to keep the mains and rods bearings from failing, when say the cam ,bearings fail, (catastrophic fail or cam breaks in half)
saving the block.
but is a flow restricter. to the head.
if the cam is well worn, (mains in cam , at limit)
and the crank gallery pressure drops too low. the cam will starve, and seize (fail hard.
and this video, does better
3:45 here
https://www.youtube.com/watch?v=eFe43SnBlMI
http://www.fixkick.com