[DeTomaso] DeTomaso Digest, Vol 75, Issue 25-Stack Heights

[michael@michaelshortt.com]

I just want to chime in and say, I have no idea!


Seems like early AFX cars all had massively tall stacks ( mechanical ) and I
thought it was for torque.

Can Am cars and early F1 cars had medium tall stacks, some alternating
heights between cylinders.

Some very fast Porsche Road Race cars ( 904,906 and hill climb cars like the
Berg Sypders had smaller stacks,
which i assumed was for higher rpm ( and had the sounds to prove it ).

I have photos of all three if you are interested.

Is there a box to check that you like it just because it looks really cool?

 Michael Shortt

On Mon, Oct 25, 2010 at 2:47 PM, Ken Green <kenn_green at yahoo.com> wrote:

> There were a lot of BBC powered cars so it's very possible that you are
> correct.
>
> Ken
>
> --- On Mon, 10/25/10, Julian Kift <julian_kift at hotmail.com> wrote:
>
>
> From: Julian Kift <julian_kift at hotmail.com>
> Subject: RE: [DeTomaso] DeTomaso Digest, Vol 75, Issue 25-Stack Heights
> To: kenn_green at yahoo.com, "De Tomaso List" <detomaso at realbig.com>,
> rcbsons1 at aol.com
> Date: Monday, October 25, 2010, 11:42 AM
>
>
>
>
> I bet it was a Big Block Chevy, much of that is an idiosyncrasy of the BBC
> port design, where the ports opening into the center of the cylinder work
> better than those that point into the cylinder wall. Cylinders 2, 3, 6 and 7
> will have shorter stacks and require less spark advance and typically also
> run with a shorter spark plug than 1, 4, 5 and 8.
>
> Julian
>
>
>  > Date: Mon, 25 Oct 2010 10:59:38 -0700
> > From: kenn_green at yahoo.com
> > To: detomaso at realbig.com; RCBSONS1 at aol.com
> > Subject: Re: [DeTomaso] DeTomaso Digest, Vol 75, Issue 25-Stack Heights
> >
> > I asked some of the guys working on a Group 7 car at Laguna Seca about
> the unequal length stacks some of the cars have, and they told me that was
> to spread out the power band by giving some of the cylinders greater VE at
> one RPM, and other cylinder greater VE at another RPM.
> >
> > Makes sense, but seems a little funky also because some cylinders would
> be a little rich and others a little lean if they are all getting the same
> amount of fuel.
> >
> > Looks cool.
> >
> > Ken
> >
> > --- On Mon, 10/25/10, RCBSONS1 at aol.com <RCBSONS1 at aol.com> wrote:
> >
> >
> > From: RCBSONS1 at aol.com <RCBSONS1 at aol.com>
> > Subject: Re: [DeTomaso] DeTomaso Digest, Vol 75, Issue 25-Stack Heights
> > To: detomaso at realbig.com
> > Date: Monday, October 25, 2010, 10:34 AM
> >
> >
> > One of our Pantera owners has a Lola Can Am
> > car... He had Lozano Brothers (winston cup guys)
> > tweak his motor.. they called him after the first dyno
> > pull and wanted to cut his stacks on the Kinsler injection
> > The owner stated that is was a Vintage Can am car
> > (the injection system is very expensive if you can get one)
> > the owner told them that all the Can Am guys ran big stacks
> > and Lozano told them they did not know anything back then(ha ha)
> > He finally let them cut them 3/4 of an inch and they picked up
> > 6 hp on a 650hp plus motor.. he told them that was good enough
> > and not to cut any more... It is Mechanical Injection but on a 1500lb
> > car it hits hard and revs soooo quick  :):)
> >
> > Bob Benson #3 Black Pantera
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-- 







Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390


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