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

[Ron Pieper <rapieper@yahoo.com>]

Sorry...ID's get larger when heated!

Maybe it's that the aluminum threads become soft?

Ron

--- Mawster Chadwick <mawster.chadwick@home.com>
wrote:
> 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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