Lynn, I understand what you are talking about with respect to the
bearings. Ed Anderson said there was some problem (not really identified as to
what) that would cause the engine to run for as long as 20 seconds with no oil
pressure! I know if you or I had an engine that wasn't showing oil pressure in
5 seconds we would be tearing it down to find out what was wrong. Ed said this
was happening almost every time he started it, even when hot/warm. the engine
should be primed at that point with oil pressure instantly, so something was
very screwed up. He had run it for some time like that so the bearings were
taking a beating at every engine start. The engine had to be pretty tough to
hold up as long as it did. Your jointer example probably didn't run up to 2K
rpm on start up every time either. A very small film will work for some time,
but higher surface speeds require more lubrication at all times. Or perhaps I
should clarify, they require the oil pressure to "float" the bearing. In a
close fitted plain bearing wery little oil runs through at a given time. It
depends on the design clearance.
Bill Jepson
Wait Bill, I am not certain if you are referring to
MY oil system or what I reported on from Andy on HIS
oil system{:>).
My personal opinion is that Andy's use of a rubber hose
on the suction side for the oil pickup was destined for problems - either an
air leak or the hose partially collapsing from the heat and suction - but,
that is just my opinion.
I think my view is identical to yours, Bill, regarding
delay in oil pressure build up, towit in my original message:
Now, I for one would consider it a problem if I
couldn't get oil pressure within 1-2 seconds of firing up the
engine (regardless of orientation) , I would cringe thinking of metal on metal
rubbing, heating, eroding, etc. I couldn't stand it and would have to
fix it.
I did identify some of the things that could
cause a problem in any oil pickup including the ordinary pick up if you
are not careful
But that applies to the pickups in the
auto orientation as well. If you have a leak (didn't use a gasket,
sealant, hole in the pickup tube, stuff stuck on your screen, etc) on the
suction side, you are going to have trouble getting oil pressure
quickly.
I have fortunately never had any oil problems
(if you don't count the time I did not get the key situated properly on the
oil pump shaft {:>)) and certainly would not tolerate a 20 +second lag in
oil pressure. But, I do pay careful attention that my metal plate is
sealed as well as bolted to the oil pickup opening. My metal tubes
actually extends approx 1/2" into the oil pickup hole.
Ed A