I Lik dose tings toooo. Want one real bad
>From: Dick Jurkowski <lsr_man@yahoo.com>
>Reply-To: Dick Jurkowski <lsr_man@yahoo.com>
>To: ardunbill@webtv.net, V4GR@aol.com, land-speed@autox.team.net
>Subject: Re: Ardunology
>Date: Mon, 22 Nov 1999 06:38:07 -0800 (PST)
>
>IF Anybody cares? IF ANYBODY CARES! Hey, I'm a
>died in the wool flathead and hemi guy. Lets
>hear more. (My wife said the flat head is very
>evident on top of my shoulders, and the hemi is
>very visible under my belt!)
>
>--- ardunbill@webtv.net wrote:
> > Hi Rich and Folks. Glad to see some interest
> > in my favorite subject.
> >
> > It is not easy to get your hands on Facts about
> > the original Ardun
> > heads. There is a large body of mythology
> > along with the facts. Period
> > journalism has errors. Misprints abound.
> >
> > Looking at the original company literature, it
> > states the head castings
> > are Alcoa 355-T6. OK, thinks I, this is merely
> > a misprint for the
> > well-known 356-T6. But no! Machinery's
> > Handbook gives 355 as a common
> > casting alloy, along with 356, and very little
> > difference between them.
> > So let us say that the original literature is
> > correct, and accept the
> > castings as Alcoa 355-T6. The T6 means a
> > certain heat treatment applied
> > (details known to experts) but I do know it
> > makes the castings harder,
> > tougher and stronger, all good.
> >
> > Today's repros are said to be cast of Alcoa
> > 356-T6. Probably some
> > slight difference, have we any experts out
> > there who can tell us what
> > the practical difference is?
> >
> > The cartridge fire principle where the spark
> > plug electrodes are up in a
> > little hole about 3/8" from the combustion
> > chamber has always been
> > intriguing. Several Ardun greats have told me
> > that this has no effect
> > on power (most of the older records were set
> > with cartridge fire
> > heads), just requires more spark lead because
> > the ignition is slowed
> > down. Clem TeBow recently told me at C.T.
> > Automotive they found on the
> > dyno that with a Vertex mag, power was the same
> > from 40 degrees to 50
> > degrees advance, so they selected 45 as a
> > conservative figure. Every
> > combination is different, so your results may
> > vary. When the cartridge
> > fire is deleted, as with today's repros, you
> > use about 36 degrees total
> > advance, depending on fuel, engine size,
> > compression ratio, etc.
> >
> > The original Ardun heads are heavy and strong,
> > and the general lore is
> > that they have survived 50 years very well, not
> > very prone to cracks or
> > serious corrosion. Obviously there are a lot
> > of them still around.
> > Zora told me about 300 sets were made. I
> > imagine probably at least 200
> > of them are still with us, maybe more. Not
> > something you throw out
> > readily.
> >
> > Speedy Bill at Speedway has an Ardun repro
> > project which has not yet
> > been completed. He told me that Arduns on
> > nitro are prone to cracking
> > in the top of the chamber. If he meant
> > something like 90% at
> > Bonneville, I wouldn't fault the heads or the
> > designer for that, it is
> > far beyond the original design intentions.
> > Ardun experts have told me
> > that if any cracks did arise from any cause,
> > they cured them by expert
> > welding and remachining.
> >
> > What connection did Ardun and the Hemi Chrysler
> > have?? Stay tuned (if
> > anybody cares) for more documented speculation.
> > Regards, ArdunBill in
> > Chesapeake, VA.
> >
> >
>
>
>=====
>Dick J in East Texas
> - - ECTA #72 - -
> G/FCC - FX/STR
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