I think the biggest problem you would have with the MG setup is going to
be injection jets. There are two ways to do nitrous that I am aware of,
port injection (like fuel injection) and carb plates. Carb plates are a
sprayer that fits like a carb spacer under any of your favorite neighborhood
american holley pattern carbs.
My best guess for a setup would be either a custom manifold to hold a square-
bore holley (probably the easiest) or to mount nitrous and fuel jets into
each port of the stock manifold. The extra fuel needs will come via fuel
injection jets that are part of the NOS system. when the NOS is triggered
it will fire the NOS and the aux Fuel jets, all of this happening after
the carbs. Under NOS use, the only thing the carb is doing is controlling
air, and since air is a function of volumetric efficiency, displacement,
and RPM, and none of these are changing, the carbs will probably work.
For non-NOS driving you will be using the carb just as always. When you are
on the NOS, everything you care about will be happening past the carb, so
you really don't care about it. Remember that the function of the NOS is
to get about 6x the concentration of air into the engine as you could get
with atmospheric air. All this because air is the limiting factor in
combustion. This is the same way a turbo and a supercharger work - way
more air.
With that added air, you can use added fuel. For a forced induction car
you are always using the induction so you always need the extra fuel; for
NOS you only use it at WOT (wide open throttle) or via manual control
(depending on setup) so you only need the extra fuel when you are using the
NOS, hence the fuel jets that you will need for the setup.
Depending on which of the above routes you went, you could buy a
kit to do either. Once you installed the kit you would probably want to
run a seperate fuel pickup, with high flow filter, to the fuel pump that
undoubtedly came with the kit. It would probably be a holley red pump (~15psi).
The last thing to consider would be if you went SUs and injectors in the
manifold. Since our manifolds only have two ports, you would either be
splitting the jets between the two cyls each port feeds, or you would
need 4 jets in each port of the manifold (2 NOS, 2 fuel). This is important
because NOS is rated by HP or 'shot' a 100shot (100hp) kit will give its
power over the whole engine, so each jet is worth 25hp over a 4cyl engine.
So, if you bought a 4-cyl 100shot kit, and installed half the jets, one
each in each side of the manifold, you would only have a 50shot system.
So, if you only put one set in each part of the manifold, you would buy
the kit (or jets) twice as big as you want so that when they are split
between two cyls they make the power you intended.
Oh yea, you would also have to insulate the HE*! out of the lines, since
our exhaust is right under our intake. This stuff is very explosive and
the last thing you want is to burst a line and blow your car to
smithereens. I wish I could show you pics of what happens when this stuff
blows, but it looks like a missle hit the car.
If you followed all of that you probably know enough to install one.
Is this still purely academic? This is starting to sound fun.
--
James Nazarian Jr
71 MGB roadster
71 MGBGT-V8 in need of paint
01 Impreza 2.5RS
A complex system that does not work is invariably found to have
evolved from a simpler system that worked just fine.
On Tue, Jul 17, 2001 at 01:44:46PM -0000, Scott Allen profoundly declared:
>
> So do you think the dual SU would work?
>
> -Scott
>
>
> >From: James Nazarian Jr <jamesnazarian@netzero.net>
> >To: Scott Allen <scottinarl@hotmail.com>
> >CC: mgs@autox.team.net
> >Subject: Re: NO3 in a B?
> >Date: Mon, 16 Jul 2001 11:18:05 -0600
> >
> >Big fuel pump. The primary cause of nitrous engines blowing up is too
> >little gas, not too much nitrous. So you gotta make sure you get enough
> >gas there. That would be my first step. The rest would come down to
> >how much nitrous would you want to use?
> >
> >--
> >James Nazarian Jr
> >71 MGB roadster
> >71 MGBGT-V8 in need of paint
> >01 Impreza 2.5RS
> >
> >A complex system that does not work is invariably found to have
> > evolved from a simpler system that worked just fine.
> >
> >On Mon, Jul 16, 2001 at 03:05:20PM -0000, Scott Allen profoundly declared:
> > > All,
> > >
> > > This question, and the discussion that may follow is for purely academic
> > > purposes.
> > >
> > > I helped a friend install a nitrous, (sp?) kit in his Japanese import
> >last
> > > weekend, and I was wondering if anyone had done this, or heard of
> >someone
> > > doing this with a B?
> > >
> > > I'm also wondering what you should/could do to the B engine, if you were
> > > going to put a nitrous kit in to "beef it up" so it could take the
> > > punishment.
> > >
> > > I know it'd be a foolish thing to do with a B, but I can't help
> >wondering...
> > >
> > > Thanks in advance,
> > >
> > > Scott Allen
> > >
> > > 74 1/2 BGT
> > > 52 TD
> > > _________________________________________________________________
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
///
/// mgs@autox.team.net mailing list
/// (If they are dupes, this trailer may also catch them.)
|