Joe,
A single Stromberg with the following modifications: "....all the emission
passages on the right hand side of the carburetor are blocked off either
with aluminum plugs or epoxy. Fill the holes in the carburetor throat as
smoothly as possible thus reducing the amount of sanding and polishing
afterward. The throttle shaft is thinned down to approximately one-half its
diameter by filing flats on either side, pop-rivet the throttle in place,
silver solder the whole assembly, and afterward lightly grind the pop-rivets
flush with the shaft. Leave the choke assembly on the left side of the
carburetor intact as this will assist starting. The fuel inlet valve is
replaced with a 2.5 #12855. Fuel pressure of 3.5 - 5.0 P.S.I. can be used
if the modified float spindle #B22561 and spring #B22562 are fitted.....The
carburetor body is taper bored from stock size at the bridge to 1.530" at
the intake flange.....The bridge is lowered .100" by boring in the lathe.
The carburetor is mounted to the manifold with a 3/16" aluminum spacer plate
with grooves on either side to accept 'O' rings."
When speaking of the fuel system, the manual references the use of a Holly
Model P6145 fuel pump, which is a low pressure high output type pump. It
further states that this set up is imperative with a high consumption single
carburetor.
Since the original question dealt with twin HS4's, I'll go back to sleep
now.
Regards,
Ed
Joe Curry wrote:
> Ed,
> Does it say what carb. setup that is for? I recall reading (but I can't
> for the life of me remember where) that the 2-4 psi setting is correct.
> I recently was having a problem of too much pressure and that resolved
> it. I checked briefly in the Haynes book and didn't see anything.
> Maybe it was in the notes that came with my carb. rebuild kit. I'll
> look further as I get time.
>
> Joe Curry
>
> Edward Hamilton wrote:
> >
> > Mark,
> > According to the Spitfire 1500 Competition Preparation Manual, "A fuel
> > pressure regulator should be mounted on the firewall to enable fuel
> > pressure to be maintained at 3.5 - 5 lbs. sq./in."
> >
> > Regards,
> > Ed Hamilton
> >
> > Joe Curry wrote:
> >
> > > Mark,
> > > Do you have an electric fuel pump, perchance? If it is one of the
> > > late
> > > model universal ones, it will put out way too much pressure (on the
> > > order of 15psi. I believe that somewhere between 2 and 4 psi is the
> > >
> > > recommended pressure for SU's. I run my HS2's at 2.5.
> > >
> > > Joe
> > >
> > > Mark Milotay wrote:
> > > >
> > > > I was wondering if someone could tell me the correct fuel flow
> > > pressure for
> > > > an '80 Spit, running dual SU HS4's? I have a flooding problem that
> > > new
> > > > floats and grosse jest have not solved. The car is still running
> > > like a
> > > > broke dick dog. It gets progressively worse the longer you drive
> > > the car,
> > > > then improves after sitting.
> > > >
> > > > Thanks,
> > > >
> > > > Mark
> > >
> > > --
> > > "If you can't excel with talent, triumph with effort."
> > >
> > > -- Dave Weinbaum in National Enquirer
> >
> >
>
> --
> "If you can't excel with talent, triumph with effort."
>
> -- Dave Weinbaum in National Enquirer
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