Re: [Amc-list] Motor Oil & Filter Confusion (where do I start)

[Tom Jennings <tomj@xxxxxxx>]

On Mon, 17 Mar 2008, Davis Martin wrote:

> I am not sure I follow what your asking. large clearances with light weight oil, and then you mention not having enough bearing clearance ?

Sorry, I was un-clear. I've read that the thin oils were designed
for modern motors with super-tight bearing clearances, such
that thin oils make a good lubricating/supporting film, and
that stuff like our AMC engines are designed with relatively
large running clearances, requiring a thicker oil (30 weight,
etc) to make that supporting and lubricating film.

How much of that is true, is there a way to get those small
improvements (energy loss from all the suspended oil) in our
old-design motors by using thin oils, but without endangering
them because they have larger bearing clearance gaps.



>
>
> Tom Jennings <tomj@xxxxxxx> wrote:
>   On Sun, 16 Mar 2008, Davis Martin wrote:
>
> > Ya the lighter the oil, the less resistance in the engine.
> > This makes for slight gains in HP. Somthing the big boys do
> > to try and gain a slight advantage over the next guy.
>
> So what's the story with thin (say 0W-15 mobil1 synth) in
> older-design motors with relatively large clearances? I mean
> nicely made, not old, worn out.
>
> WIll that leave not enough bearing clearance? Will piston
> skirts suffer?
>
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