This is all fine and dandy but only good for a BN2, or a BN1 w/ modern
gearbox. 3 spd geerbox can't handle the add'l power!
On 9/25/08, Curt/Nancy Arndt <cnaarndt@gmail.com> wrote:
> Tadek,
>
> I spoke with Denis Welch some years ago about his heads and other issues.
> Originally the Aluminum head was completely redesigned by SC to improve the
> breathing. Denis Welch initially used the same casting but has modified it
> over the years to improve what he saw were shortcomings in various areas. I
> don't know if he is still using the same casting or not, but I assume that
> both source the same basic casting from one foundry. I believe that Denis
> has a bit more input now than when he first started.
>
> Several years ago I visited with Mark Lambert of Nashville, TN who was
> technical adviser for the club at the time. Mark has done the only real
> technical evaluation of the aluminum head (The SC version) that I know of
> and the results were impressive. According to Mark the original power band
> of the engine with the cast iron head was 2,500 to 3,500 rpm. The power
> band with the new head (stock H4 carburetors) was increased to 2,200 to
> 4,200 rpm. Mark also claimed that a 100 set up with the aluminum head and
> stock carburetors would outrun a stock car with the LeMans setup as
> delivered from the factory, all do to improved breathing in the head. The
> LeMans modified cars with the H6 carbs were trying to force more air into an
> already restrictive stock head which of course assumes that the iron head
> was not modified (ported and polished.)
>
> Even then, according to Mark there was just so much you could do to open up
> the original iron unit which is one reason that led to SC's decision design
> a new head. And, there is Micheal's quote which I also use, that it's just
> a matter of time before an iron head will crack this making the supply of
> original heads a diminishing resource.
>
> Cheers,
>
> Curt Arndt
> Carlsbad, CA
> '55 BN1, '60 AN5 :{) '72 RWA Midget, '06 Cooper S
>
> On Wed, Sep 24, 2008 at 11:41 AM, Bob Spidell <bspidell@comcast.net> wrote:
>
>> re:
>> " from SC it has a single piece of steel inserted into the head with two
>> valve seats cut into it"
>>
>> Is that what's known as "figure eight" valve seats?
>>
>>
>> Bob
>>
>> --
>> ***************************************************************
>> Bob Spidell San Jose, CA bspidell@comcast.net
>> '67 Austin-Healey 3000 '56 Austin-Healey 100M
>> ***************************************************************
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--
Sent from my mobile device
Alan
'52 A90
'53 BN1
'64 BJ8
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