Re: Crank scrapers

[Barrie Robinson <barrier@bconnex.net>]

Having done thermodynamics at university some considerable years ago I do 
have an interest in items that claim big advantages in engine 
weaponary.  Considering the amount of lost power by resistance to 
water,oil, gas and air having to pass through tubes, vents, galleries and 
such, I cannot see that oil mist and clinging oil to the crank will be a 
significant part of the loss.  Perhaps more gain would be achieved by 
coating all the passageways for the engine fluids.  I am prepared to be 
convinced by facts provided by independent sources but in the meantime I am 
not forking out for such an item!

At 07:05 PM 7/10/2003 -0700, David Kernberger wrote:
> 7/10/03
>
> James & others,
>
>         Thanks for the response.  A simple enough idea once one gets the
> hang of it.  It is, however, very hard for me to imagine enough oil
> clinging to the rotating crank and rod big ends to be a significant drag or
> weight hinderance.  Is there really any measurable difference???  I suppose
> a different pattern would be required if one is doing any stroking, like
> with a Buick 300 crank, or whatever-----.  A new word in my mechanical
> vocabulary.
>
> Cheers,
> Dave Kernberger
>
> ------------------------------------------------------
>
> >A crank scraper is a thin piece of metal that runs the length of the
> >sump.  One edge is mounted to the block, and the other side is cut to
> >match the profile of the crank shaft.  It almost looks like a house key.
> > As the various rotating parts of the crank pass through the plane of
> >the scraper, any excess oil is ripped off the crank.  This cuts down on
> >drag, reciprocating mass, and keeps the oil in the pan.  "scraper" is a
> >bit of a misnomer, since it and the crank never actualy touch, there is
> >just enough margin for it to pass through but not bring much oil with it.
> >Hope this helps.
> >James J.
> >
> >
> >David Kernberger wrote:
> >
> >>7/9/03
> >>\
> >>Daryl,
> >>
> >>      Please pardon my ignorance but what in heaven's name is a crank
> >>scraper?????  I'm trying to pkcture such a device and am failing miserably.
> >>Thanks in advance.
> >>
> >>Regards,
> >>David Kernberger
> >>
> >>------------------------------------------------------
>
>
> ///
Regards
Barrie

Barrie Robinson
barrier@bconnex.net 
///
///  mgb-v8@autox.team.net mailing list
///  Send admin requests to majordomo@autox.team.net
///  Send list postings to mgb-v8@autox.team.net
///  Edit your replies!  If they include this trailer, they will NOT be sent.
///