Re: [Tech, not specifically Roc]Running a compression test

["Mawster Chadwick" <mawster.chadwick@home.com>]

The sparkplug hole will get fractionally smaller as the engine heats up.
(physics)

Same principal as when you turn a hot tap on and the water flow decrases.
Internal Diameter get smaller when heated (any hole, except my girlfriend's)
, and Outer Diameter gets bigger when heated (if it's a pipe)

Oh god what have I done?

Chadwick


----- Original Message -----
From: "Ron Pieper" <rapieper@yahoo.com>
To: "Ryan McCarthy" <rmccarthy777@msn.com>; "Scirocco List"
<scirocco-L@scirocco.org>
Sent: Saturday, February 24, 2001 12:50 PM
Subject: Re: [Tech, not specifically Roc]Running a compression test


> Gotta ask why...assuming steel plug, aluminum head,
> the head will expand more than the plug   Heating a
> material with a hole makes the hole larger, and since
> the head expands more than the plug grows, the plug
> should be less tight...no?
>
> Ron
>
>
> --- Ryan McCarthy <rmccarthy777@msn.com> wrote:
> > I don't know about your bike, but personally on my
> > roc, I wouldn't warm the
> > engine up first. You're likely to strip the plug
> > threads out of the head. Do
> > it cold and dry through one time, then go back
> > through and do it cold but
> > with a few drops of oil into the chambers. HTH
> >
> > Ryan
> >
> >
> >
> > > Hi all,
> > >
> > > A general tech question for you all...
> > >
> > > I bought a compression gauge and want to test my
> > motorcycle.  Of course,
> > > the stupid instruction sheet was glued into the
> > plastic bubble, packaging
> > > thing the gauge came in.  Since they are now
> > destroyed, I want to make
> > sure
> > > I'm doing this right.  Basically, I believe the
> > steps are warm up the
> > > engine, remove the spark plug wires from all
> > plugs, remove one spark plug,
> > > insert gauge, hit the starter for 3-4 cycles,
> > replace spark plug, and then
> > > repeat for remaining plugs.  Is this right?  Any
> > tips, hints, or warnings
> > > would be appreciated.
> > >
> > > - Brad
> > > '86.5 Volkswagen Scirocco 16v
> > > '76 International Scout II
> > >
> > >
> > >
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