From: kuhrick (kuhrick@comcast.net)
Date: Mon Sep 22 2003 - 06:28:43 PDT
At 12:33 AM 9/22/2003 -0500, Adam Suess wrote:
>I've read some where that a high % of engine where occurs at start up.
>Something like 70% or 80%. the way I understand it is that during normal
>engine operation the bearings and other parts ride on a thin film of oil
>and should not normally directly contact the two metal faces. when a
>engine sits for a bit much of the oil drains down and upon start up no
>film is present to prevent metal on metal contact. In the case of the
>multi fuel and other engines the oil also drains back out of the filters
>and when started the pump must fill them up again before oil goes to the
>moving parts. The difference in engine noise is some more rattling and
>also internal engine friction until the oil reaches it. I use to work on
>the rail road and got this info from one of there diesel mechanics after
>inquiring how they got there big diesels to last so many hrs. Also there
>is some issues of oil break down during operation due to high oil temps or
>over lugging the engine exceeding the pressures the oil can protect at.
>All second hand info to me but seems to make since. The Rail Road ran
>straight 50wt and the engine had oil pressure "electric pumps" before even
>cranking it to start they rarely shut it off any way. I switched to semi
>synthetic oil myself because it is suppose to hold to the parts better
>after shut down. Also tolerates higher temps and pressures or so they
>advertise. I did note a significant drop in full load oil temp switching
>from Shell Rotella T to Cenex Maxtron DEO in my tractors as well as easier
>cranking. Lighter engine loads I saw little or no change in oil
>temp. The Mack engine in my M54A1 takes quite a while to get pressure and
>sounds much different once it does also.
>
>Adam Suess
AND
i feel the man that get payed to repair the motors would not what you to
make them last longer they would be out of a job if they did
and
car makers don't what cars and there motors to last too long they would
sell less new cars
mite be the same with M.V.,s butt us tax payers are paying for them so y
would most in the supply chain care
in nuke power plant they keep the motors at operating temps and flow
iol 24/7 wanting for a power drop and the gen sets are running and up
to speed and under full load in 5-10 secs i readed and tham sen sets run
the stuff to to a neat safe shut down not the core cooling pumps ireaded
i'l keep my m886
This archive was generated by hypermail 2.1.4 : Sat May 07 2005 - 20:24:27 PDT