The quote is overstated for sure.
and ...some pre-pressuring would be better than no pre-pressuring, long
term.
As you say, in the regular world it doesn't seem to matter much really.
as for new engine assembly,
there is great product for that.
It's sold by Clivite, the well-known engine bearing company.
It's like thick pink oil.
you assemble the crank and bearings .......and any bearing surfaces with
it.
My machine shop swears by it.
and tells of an engine they put together ( Ford Falcon inline six ) with
it, and somehow that engine ended up driving 300 miles with no oil pressure
..
much of the engine was fried, but the bearings were fine .......fwiw.
I put a pre-oiler and oil pressure acuumulator system on an SVX engine in a
subaru engine in a T3 van once.
There's a large can ( the company is Accusump, so you can google it )
...
which has a spring and piston in it. The running engine pumps oil
into this accumulator can thing ( two sizes, the bigger ones is 3 qts I think
)..
it can provide oil pressure to the engine if oil pressure gets low for any
reason ( it's a racing part , for cars like dune buggies that jump all over the
place ) ..
or ....on a cold start you can route previously stored pressurized oil
right into the engine.
you could turn on your van, flip the switch to pre-oil the engine, and
watch the oil pressure rise on your OP gague, all before the engine ever cranks
over. Slick.
I didn't trust it though, ultimately, because I don't see how it controls
oil level in the sump.
And I couldn't get any answers from the company I was satisfied with.
there are two important things about oil in a wet sump engine, pressure,
and level in the sump.
I don't see how it knows what the oil level is, and too full oil is a
seriously bad thing.
Scott
----- Original Message -----
Sent: Thursday, May 05, 2011 12:59
AM
Subject: RE: [Syncro_T3_Australia] Pre
lube
Hartmut,
This is a clever
bit of misinformation. The text implies that the main and big end
bearings are bone dry, which they arent. Even if the engine has
been standing for months, there is a film of oil on the bearing
surfaces. When the engine is fired up, the loads on the mains and
big ends are very low and dont become significant until well above idle or
until a load is applied to the engine. The residual film is well
able to cope with these very low initial loads and it takes only a few
crankshaft revolutions for the oil pump to be supplying ample
oil.
Claims like this
are totally misleading:
This design flaw
results in dry bearing abrasion each and every time the engine is
started.
If this could be avoided up to 40% to 60% of total engine wear
would be eliminated.
When an engine is
being built or rebuilt, the bearing surfaces are always coated liberally with
engine oil so there is no such thing as a dry start. The 40-60%
quoted above is pure fantasy.
Rest assured that,
if this was an actual problem, such systems would be built in to all
production aircraft, automotive and motorcycle piston
engines.
Les
From:
Syncro_T3_Australia@yahoogroups.com
[mailto: Syncro_T3_Australia@yahoogroups.com ] On Behalf Of Hartmut Kiehn
Sent: 05 May 2011 13:25
To: Hartmut Kiehn
Subject: [Syncro_T3_Australia] Pre
lube
Hi Les,
just reading an article in
ZEITSCHRIFT / Club Vee Dub Sydney about a clever auto pre lube system.
Can you offer some inside into this topic please ?
The info on
the company is at www.autoenginelube.com
MOre info by Bob Hoover in the mag page 37. Would be interesting what you
think.
Hartmut