Date: Thu, 13 Sep 2007 18:21:58 +0000
Reply-To: rubatoguy@COMCAST.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Todd Last <rubatoguy@COMCAST.NET>
Subject: Re: How do you check compression?
Or you could use a compression gauge with a hold feature that automagically will keep the needle at the highest reading until released. (with a button on the side of the gauge.)
For us lazy, presbiopics.
Todd
'88 Westy
-------------- Original message ----------------------
From: David Kao <dtkao0205@YAHOO.COM>
> It sounds like chuck, chuck, chuck. The needle of the gauge
> will jump (upward) upon each chuck (stroke). The question
> is should it be measured until the needle stops moving higher
> or should the reading be taken at the 4th stroke.
>
> Dennis suggested to take the reading at the 4th or 5th. But he also
> said to read it until it reaches the highest reading.
>
> 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.
>
> Vanagon engine seems need more than 4-5 strokes to reach max compression
> reading. Correct me if I am wrong about this.
>
> David
>
>
>
>
> --- Michael Elliott <camping.elliott@GMAIL.COM> wrote:
>
> > Engine warmed-up, cold, doesn't matter?
> >
> > Counting number of strokes -- is that the number of wuh-wuh-wuh sounds the
> > starter makes?
> >
> > --
> > Mike "Rocket J Squirrel" Elliott
> > 71 Type 2: the Wonderbus
> > 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> > 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
> > KG6RCR
> >
> >
> >
> > On 9/12/2007 8:29 PM Dennis Haynes wrote:
> >
> > > Some more variables. Crank until gauge stops rising. You can hear the
> > > change. Count the number of strokes. Should be 4-5. The design of the
> > > gauge can affect this. The hose length and placement of the valve will
> > > make a difference. Of course you will also want to do a leak down test. On
> > > older engines it is common for the front two cylinders (1-3), to show
> > > lower compression then the rear and still check good with the leak down.
> > > This can indicate worn cam lobes.
> > >
> > > Dennis
> > >
> > > -----Original Message-----
> > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> > > David Kao
> > > Sent: Wednesday, September 12, 2007 10:31 PM
> > > To: vanagon@GERRY.VANAGON.COM
> > > Subject: How do you check compression?
> > >
> > > I was told by a mechanic that when checking compression for a 4 cylinder
> > > engine I should get 4 strokes, no more than that, and get the reading.
> > > But Bentley Manual says to continue to crank until getting the highest
> > > reading. So how do you folks do it? How many strokes on the average do
> > > you crank to get the highest reading?
> > >
> > > David
> > >
> > >
> > >
> > >
> > >
> > > __________________________________________________________________________
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> >
>
>
>
>
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