Date:         Thu, 13 Sep 2007 12:00:34 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: How do you check compression?
Comments: To: Mike S <mikes@FLATSURFACE.COM>
In-Reply-To:  <20070913181749.BA0921165C3@hamburg.alientech.net>
Content-Type: text/plain; charset=iso-8859-1

Mike, excellent points. Vanagon engine is not high performance engine.
That's the reason it takes more strokes to get meaningful compression
reading. Am I making a reasonable explanation?

David



--- Mike S <mikes@FLATSURFACE.COM> wrote:

> At 01:43 PM 9/13/2007, David Kao wrote...
> >I believe a cylinder with excellent compression will give you highest
> >reading on the 4th stroke. A cylinder not in optimal compression
> >will require 6 - 8 strokes to reach max. reading. So the reading as
> >well as number of stroke should both be considered for judging the
> >compression of a cylinder.
>
> Keep cranking until the reading reaches a maximum. The number of
> strokes is a matter of the cylinder displacement, the compression
> ratio, and the additional volume added by the meter (hose, couplings,
> meter). Also the cranking speed, due to both leakage and adiabatic
> effects. For a given gauge, the number of strokes will be greater as
> the displacement decreases, because it has more of an effect on the
> volume.
>




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