Back when I was in the diesel engine business and before, as far as I know
before accusump, CAT came up with a prelub starter. it had a position on the
ignition for prelub and then to start the engine. To start you would turn to
position 1 and run the prelub pump then continue to start. At the time it
seemed like a good idea and worked well.
On Sep 15, 2010, at 10:00 AM, Bill Babcock wrote:
> I really doubt that residual oil is sufficient, for the same reason: These
are
> babbit bearing, not rollers. They require oil under pressure to work. A
> residual film doesn't do much, and under the weight of the crank it drains
> away to nearly nothing in a short time. The oil passages seem to do a good
job
> of draining too. Without an accusump there is always a few seconds waiting
for
> the oil pressure to show. I can't see a reason to rely on faith that it's
> sufficient, when all the evidence at hand tells me it isn't. Especially
when
> there's a ready alternative. I don't do many things because "I've always
done
> it that way". I generally have a reason, and in this case it's hard for me
to
> understand where you are headed with this notion.
>
> Seriously, which would you rather do, turn your ignition on and immediately
> see 20 pounds of oil pressure before you start the engine, or turn it on
and
> see no oil pressure for five seconds after the engine started?
>
> On Sep 15, 2010, at 1:21 AM, Randall wrote:
>
>>
>>> While I certainly have not done any scientific testing, I am
>>> completely
>>> convinced that running an accusump greatly extends the life
>>> of my engines.
>>
>> I have no doubt of that. When running under load, those primitive babbit
>> bearings require a constant flow of oil to keep them cool.
>>
>> My question was solely about pre-lubing before startup. Unless you have
>> just assembled the engine without assembly lube, IMO there is plenty of
oil
>> leftover to cover a second or two of idling (meaning very little bearing
>> load, and very little heat generated through bearing losses).
>>
>> OTOH, I understand that you've "always done it that way", and it certainly
>> does no harm. Wouldn't want to take a chance on it actually having some
>> benefit. So carry on, and don't mind me.
>>
>> Randall
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