The four tube header ending with a collector then into a large diameter pipe
absoultly gave more power on the top end. The branch pipes with two into one
into a collector absolutly gave better drivability and mid and bottom end.
MANY engine dyno tests proved this for a fact (my little opinion). The four
tube into collector type that gave the best power was with the tubes as long
as I could make them and still keep them inside the body, so they were right
next to the frame then turned into the collector. The little engine (Spit)
worked best with the other type header.
----- Original Message -----
From: James Libecco <jfl@neoucom.edu>
To: R. Kastner <kaskas@earthlink.net>; Bob Lang <LANG@isis.mit.edu>; Patrick
McMullen <pmcmull@ibm.net>
Cc: <fot@autox.team.net>
Sent: Wednesday, February 23, 2000 12:29 PM
Subject: Re: Spit Header;
> Kas, I will overlook your modesty in this regard, knowing some of your
past,
> to ask whether you can really even notice a difference while driving a
> mildly prepared 1500 spit with a 4/2/1 versus 4/1 header?
> thanks,
> jim
>
>
>
> Sent: Wednesday, February 23, 2000 1:35 AM
> Subject: Re: Spit Header;
>
>
> > Just from an old guy that might have had something to do with TR's in
the
> > past, when you have a little enigne there is no torque so go for the
> > obvious.
> > ----- Original Message -----
> > From: James Libecco <jfl@neoucom.edu>
> > To: Bob Lang <LANG@isis.mit.edu>; Patrick McMullen <pmcmull@ibm.net>
> > Cc: DAN DURYEE <DLDEAD@worldnet.att.net>; <fot@autox.team.net>
> > Sent: Tuesday, February 22, 2000 5:16 PM
> > Subject: Re: Spit Header;
> >
> >
> > > Hi, I thought I would take a second to welcome myself to the list. I
am
> > Jim
> > > Libecco, living in Ohio with a slowly improving autox 76 spit 1500. I
> am
> > a
> > > medical student at NEOUCOM that tries his hardest to maintain contact
> with
> > > the outside world.
> > >
> > > The question. Maybe I am missing something in the math (that's why I
am
> > in
> > > medicine and not engineering), but where does this formula take into
> > > consideration the diameter of the pipes? A Kirk header is
considerably
> > > different in size than a Stahl header. Also, how do you tune a header
> > with
> > > this formula for torque vs. horsepower, or is there a corollary
formula
> > that
> > > would accompany this?
> > >
> > > Thanks,
> > > jim libecco
> > > jfl@neoucom.edu
> > >
> > >
> > > ----- Original Message -----
> > > From: "Bob Lang" <LANG@isis.mit.edu>
> > > To: "Patrick McMullen" <pmcmull@ibm.net>
> > > Cc: "DAN DURYEE" <DLDEAD@worldnet.att.net>; <fot@autox.team.net>
> > > Sent: Tuesday, February 22, 2000 3:00 PM
> > > Subject: Re: Spit Header;
> > >
> > >
> > > > On Sat, 19 Feb 2000, Patrick McMullen wrote:
> > > >
> > > > > Dan,
> > > >
> > > > Folk...
> > > >
> > > > > I may be way off base here but this is a formula for just such a
> > > > > dimension:
> > > > >
> > > > > P=(AxSxD²)divided by(1400xd²)
> > > > >
> > > > > Where as:
> > > > >
> > > > > P= pipe length
> > > > > A= degrees duration
> > > > > S= stroke in inches
> > > > > D= diameter of piston in inches
> > > > > d= diameter of exhaust valve in inches
> > > > >
> > > > > This was given to me a number of years back by JK Jackson. I'm
> > > > > sorry I do not remember what the constant (1400) represented. The
> > > > > whole formula may be TR6 specific...but I don't think so.
> > > > > Somewhere I have a book with more math formulas then you can shake
> > > > > a stick at, all automotive related.
> > > > > Has anyone else seen this formula?
> > > >
> > > > Yes, I have. It used to be on the Temple of Triumph web site a year
or
> > > > two ago...
> > > >
> > > > > Or did I just give away a
> > > > > "Super Secret" proprietory information tid bit (sorry JK!) only
> > > > > known to Irish rocket scientist!!! (Is there such a thing?)
> > > >
> > > > I believe 1400 is a constant for the speed of sound in feet per
> second,
> > > > but I could be wrong.
> > > >
> > > > > Patrick McMullen in NC (Yes I have a brother named Mike)
> > > >
> > > > Bob in Cambridge... Massachusetts. No, not that liberal arts school
up
> > > > the creek!
> > > >
> > > > > I swear...NO whiskey was involved!
> > > >
> > > > Ummm - okay Pat. Whatever you say.
> > > >
> > > > later
> > >
> >
>
> --------------------------------------------------------------------------
> > > -----
> > > > Bob Lang Room N42-140Q | This space for rent.
> > > > Consultant MIT Computer Services |
> > > > Voice: (617)253-7438 FAX: (617)258-9535 |
> > >
> >
>
> --------------------------------------------------------------------------
> > > -----
> > > >
> > >
> > >
> >
>
>
|