Curt, As you seem so sure - WHERE will mine crack???? What will the warning
signs be?????
Robert N. Blair Yellow 65BJ8 rnbmail@yahoo.com
--- On Fri, 10/16/09, Curt/Nancy Arndt <cnaarndt@gmail.com> wrote:
> From: Curt/Nancy Arndt <cnaarndt@gmail.com>
> Subject: [Healeys] Alloy Head
> To: "Healey List" <healeys@autox.team.net>
> Date: Friday, October 16, 2009, 12:37 PM
> Hi Listers,
>
> I don't know if my first response went out on the list so
> here it is again.
> Apologies if this is a repeat.
>
> Remember my comments are only with regard to the 100 head
> and i can't speak
> on the six-cylinder version.
>
> Curt
>
> *On Fri, Oct 16, 2009 at 7:31 AM, Curt/Nancy Arndt
<cnaarndt@gmail.com>wrote:
> *
>
> John,
>
> Here's what I know. SC developed the first alloy head
> some years ago and it
> was a good design but not perfect.
>
> Mark Lambert of Tennessee, the Healey Club Technical
> adviser did an
> evaluation of the four cylinder head and was quite
> impressed. He wrote an
> article on the head plus I visited him at his shop and he
> briefed me on the
> results are as follows...
>
> - Normal power band on stock BN1/2 with iron head is
> 2500-3500 RPM. Power
> band with alloy head is now 2200-4200 RPM. Double.
>
> - Where you could barely get two fingers into the air
> passages with the iron
> head, you can get a golf ball through the passages in the
> alloy one. Much
> better breathing, which was the whole idea of the
> re-design.
>
> - Mark claimed from his testing that a stock BN1/2 with the
> alloy head
> (standard H4 carbs) would out perform a *standard* 100M or
> Le Mans converted
> 100, i.e. no ported and polished head, no headers,
> etc. The bigger H6 carbs
> were just trying to force more air through an already
> restricted air
> passages in the iron head.
>
> Now on to Denis Welch. I spoke with Denis some years
> ago about his alloy
> head and here is what he told me... Initially he used
> the same head from
> the same foundry where SC had their head made. He
> found the head deficient
> in several areas. He worked with this foundry and had
> his own head made up
> to his specifications. Same basic head but with Denis
> Welch modifications,
> plus DW offers three versions (standard, fast road, and
> full race.)
>
> FWIW, there is no deduction for using the alloy head in
> Concours judging,
> provided it's painted. Externally it's identical down
> to the original
> Westlake patent numbers cast into the head.
>
> Lastly, in my opinion, there are two types of original iron
> head. Those
> that HAVE cracked and those that WILL crack.
>
> Cheers,
>
> Curt Arndt - AH Concours Committee
> Carlsbad, CA
> '55 BN1, '60 AN5 :{) '06 Cooper S
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> Healeys@autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> You are subscribed as rnbmail@yahoo.com
>
> http://www.team.net/archive
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
http://www.team.net/archive
|