quattro Digest, Vol 2, Issue 182 ENGINE OIL/ WINTER/ WARMING CAR (tirade, yet edumacational.. D'oh!)

[Larry C. Leung]

As an FYI (and to add fuel to the debate), physical loads
non-withstanding,
more RPM builds more inertial loads by the square of the rotational rate.


And, as BMP increases due to RPM effective CR (i.e. valve overlap is
overcome
by the need for more rapid movement of gasses) there is also an RPM
related
increase in load on the valve train. 

Of course, the BMP increase is quite minor compared to a heavily loaded
engine
rod/bearing load (i.e. low RPM, large throttle opening), but it's still
there. 

Bottom line, don't try to heat the oil by low load high RPM work. There
is still an
RPM related load increase, AND it happens to be on the parts seeing the
least
amount of cold oil, the head!

LL - NY


> Date: Tue, 23 Dec 2003 11:52:11 -0500
> From: <auditude at cox.net>
> Subject: re: ENGINE OIL/ WINTER/ WARMING CAR (tirade,        yet
>         edumacational.. D'oh!)
> To: AudiBiTurbo at aol.com, quattro at audifans.com, bradym at sympatico.ca
> Message-ID:
>         <20031223165211.LRIA3905.fed1mtao04.cox.net at smtp.west.cox.net>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> I would tend to think that rpm would be worse on the valve train in 
> the head, and load would be worse for the bottom end.  The valve 
> train needs protection from the cam lobes slapping the lifters, as 
> well as the lifters needing flowing oil to pump up and keep things 
> tight.