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

[Ron Pieper <rapieper@yahoo.com>]

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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> 
> 
> 
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