Part 2: Reading Plugs, pistons, and valves (with Pics)

[Len Sabatine]

  The seat washers that make indexing  proceed faster also increases 
chamber cc's
  in the specific Cyl, versus  stepping Thru numerous plugs to get the 
index on the $. The Nitty gritty.
  The seat washers don't cut it, after investing hours to get the chamber 
cc's balanced. Ok if having
  the chambers vary doesn't matter , It would to me!
  Len

>Ahh, got what ya mean.
>think it's Jegs has a plate with a plug tapped hole in it.
>Then you can scribe a line to show where cylinder lines up per plug,
>supposedly for faster indexing.
>Me, I gota couple 3 packs of shims, a mike, and a magic marker (ie cheap)
>Bruce
>
>
> > Oh definetly not the place for indexing.. the serious drag guys obsess
>over
> > that level of detail (I've read).
> >
> > I thought the detail would be interesting. While the heads are off though
> > its good to screw the plugs in and see where they end up, depthwise.
> >
> >
> > ----- Original Message -----
> > From: Bruce Plecan <nacelp at bright.net>
> > To: <gmecm at diy-efi.org>
> > Sent: Saturday, December 02, 2000 7:19 PM
> > Subject: Re: Part 2: Reading Plugs, pistons, and valves (with Pics)
> >
> >
> > >
> > > In anything on the street indexing really isn't a HP issue, IMO.
> > > I does give ALOT more uniform plug readings.
> > > The side electrode when positioned just right in a SBC can mask the burn
> > > pattern for 1/2 the plug.
> > > Plugs should be in and out often enough that there is no carbon **build
> > up**
> > > on the exposed threads.  Also, if the head sees and anti-seize from time
> > to
> > > time treats the plug enough for it not to stick with AL heads.  I've
>even
> > > been known to use a little AS on iron headed engines where the plugs are
> > > changed alot
> > >
> > > Also, be advised, AS is an insulator, and when used in excess can cause
>a
> > > miss
> > > Bruce
> > >
> > >
> > >
> > > > The only thing I have to contribute is that I've read that the plug
>base
> > > > should be exactly flush with the lowest point of the comb chamber
>entry.
> > > ie
> > > > there should be no 'thread pit' for carbon to collect in regardless of
> > how
> > > > much male plug threading is exposed on the 'thin side' of the plug
>hole.
> > > > Indexing with spacers without considering this leaves compeditors who
> > have
> > > > indexed thru plug selection (buy 200, find the ones that thread in
> > PERFECT
> > > > indexed position, sell the rest) with an advantage, however small.
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: Shannen Durphey <shannen at grolen.com>
> > > > To: <gmecm at diy-efi.org>
> > > > Sent: Saturday, December 02, 2000 5:51 PM
> > > > Subject: Re: Part 2: Reading Plugs, pistons, and valves (with Pics)
> > > >
> > > >
> > > > > I see a problem.  Piston 2 is in the wrong spot!  It should never be
> > > > > between 2 others in a sb chebbie... : )
> > > > > Shannen
> > > > >
> > > >
> > > >
> > >
> >
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