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

[Len Sabatine]

   There's lots of talking about variables , just pointed to another one to 
add.
   Your'e right , with "most" street cars . detail like this doesn't matter 
, since
    the tune up and remainder of the vehicle combination are way off target 
anyway.
    Practically speaking , those on a low budget do what they have to do. IMO
       Len

>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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