Re: [ihc] Re: David's "diesel" 258

[John Hofstetter <hofs@xxxxxxxxxxxx>]

On Aug 20, 2004, at 11:23 AM, Ryan Moore wrote:

> ----- Original Message -----
> From: "John Hofstetter" <hofs@domain.elided>
> To: "Steven Stegmann" <steve.stegmann@domain.elided>
> Cc: "David Bongo" <dbongo@domain.elided>; <ihc@domain.elided>; 
> "ken.dunnington"
> <ken.dunnington@domain.elided>
> Sent: Friday, August 20, 2004 11:13
> Subject: Re: [ihc] Re: David's "diesel" 258
>
>
>
> > On Aug 19, 2004, at 10:18 PM, Steven Stegmann wrote:
> >
> > > John,
> > >
> > > I've never done it but have heard of it.  Seems like
> > > I've seen that in some race engines too.  It might cut
> > > down on the friction???
> > >
> > > Steve
> > Steve,
> >
> > No, it's the other way around. You do the knurling to pistons whose
> > skirts have worn excessively. So, the bumps created by the knurling 
> > now
> > contact the cylinder wall.
> >
> > John
> >
> > John Hofstetter
> > Ol' Saline
> > www.goldrush.com/~hofs
> But a knurled piston only contacts at the bumps, whereas a non worn 
> piston
> contacts in a lot more area, correct/
>
> In that case, wouldn't the knurled piston have less drag than a new 
> one?
>
> -Ryan
Yes, but more friction than a well worn one.

John

John Hofstetter
Ol' Saline
www.goldrush.com/~hofs