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

[Bruce Plecan]

I'm talking about a street car, not many are running cc'd heads.
Heck the we can start worring about the specific gravity of the fuel.  The
actual O2 content of the immediate air supply, etc.
There is a practical point to me, where you just take your lumps and go on.
If really worried about the volume of the heads then need to run water
injection about full time to keep any carbon deposits from collecting.
The thick spacer is what .020", racing a plug that much (or less) isn't an
amount I'd worry about in a street car.
In a spec. class or when the budget, time, money allows, but so many tune
ups are so far off that seeing that difference is not a big issue in my
book, IMO
Bruce




From: "Len Sabatine" <sabatine at epix.net>
>   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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