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

[Dave Zug]

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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